Load Specifications
Bullet Manufacturer:MAKER
Bullet Weight:300 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:.338 ARC load data
Case Length (l3):1.3"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:33.5 Grains of Water
Primer Size:Small Rifle (SR)
Barrel Length:18"
Max. allowed Pressure:52,000 psi
Recommended Twist Rate:1:11.5
Load data in caliber .338 ARC with .338 | 300gr | MAKER .338 ARC/Spectre Expanding Subsonic bullet and 121 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon LilGun, Winchester 296 and Hodgdon H110.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 33% and propellant combustion ≥ 80%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 18"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680* | <<locked>> | 85% | 26,847 psi | 52% | 1125 fps | 90% |
| Accurate 2015* | <<locked>> | 97% | 21,727 psi | 42% | 1096 fps | 84.4% |
| Accurate 4100² | <<locked>> | 65% | 27,833 psi | 54% | 1106 fps | 99.5% |
| Accurate 5744*² | <<locked>> | 69% | 27,282 psi | 52% | 1112 fps | 91.7% |
| Accurate No. 11 FS² | <<locked>> | 73% | 26,585 psi | 51% | 1115 fps | 95.8% |
| Accurate No. 2² | <<locked>> | 65% | 45,092 psi | 87% | 1017 fps | 100% |
| Accurate No. 5² | <<locked>> | 49% | 41,191 psi | 79% | 1086 fps | 100% |
| Accurate No. 7² | <<locked>> | 53% | 32,866 psi | 63% | 1099 fps | 100% |
| Accurate No. 9² | <<locked>> | 57% | 29,733 psi | 57% | 1093 fps | 100% |
| Accurate Solo 1000² | <<locked>> | 69% | 43,772 psi | 84% | 938 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 69% | 42,482 psi | 82% | 958 fps | 100% |
| Accurate TCM² | <<locked>> | 57% | 30,023 psi | 58% | 1086 fps | 100% |
| ADI AP 100 | <<locked>> | 81% | 43,642 psi | 84% | 1112 fps | 100% |
| ADI AP 70N² | <<locked>> | 57% | 42,743 psi | 82% | 971 fps | 100% |
| ADI APS 350² | <<locked>> | 73% | 44,222 psi | 85% | 883 fps | 100% |
| ADI APS 450² | <<locked>> | 73% | 44,280 psi | 85% | 912 fps | 100% |
| ADI AR 2205² | <<locked>> | 77% | 29,515 psi | 57% | 1112 fps | 98.5% |
| ADI AR 2207* | <<locked>> | 85% | 22,278 psi | 43% | 1109 fps | 93.3% |
| ADI AR 2219* | <<locked>> | 89% | 23,424 psi | 45% | 1089 fps | 80.2% |
| ADI AS 30² | <<locked>> | 73% | 45,832 psi | 88% | 932 fps | 100% |
| ADI AS 50N² | <<locked>> | 65% | 43,033 psi | 83% | 938 fps | 100% |
| Alliant 2400² | <<locked>> | 61% | 27,079 psi | 52% | 1083 fps | 99.9% |
| Alliant AR-Comp*ᴾ | <<locked>> | 100% | 23,467 psi | 45% | 1115 fps | 86% |
| Alliant BE-86² | <<locked>> | 69% | 44,628 psi | 86% | 974 fps | 100% |
| Alliant BLUE DOT² | <<locked>> | 69% | 32,895 psi | 63% | 1102 fps | 100% |
| Alliant BULLSEYE² | <<locked>> | 61% | 43,526 psi | 84% | 1033 fps | 100% |
| Alliant Herco | <<locked>> | 81% | 43,976 psi | 85% | 1040 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 61% | 38,624 psi | 74% | 1112 fps | 100% |
| Alliant Power Pro 300-MP² | <<locked>> | 65% | 25,280 psi | 49% | 1109 fps | 98.1% |
| Alliant RED DOT² | <<locked>> | 73% | 44,846 psi | 86% | 938 fps | 100% |
| Alliant Reloder-10x* | <<locked>> | 93% | 22,713 psi | 44% | 1122 fps | 87.6% |
| Alliant Reloder-7* | <<locked>> | 85% | 23,351 psi | 45% | 1102 fps | 89.4% |
| Alliant Sport Pistol² | <<locked>> | 57% | 44,483 psi | 86% | 1043 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 69% | 45,121 psi | 87% | 1040 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 69% | 44,556 psi | 86% | 932 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 85% | 45,049 psi | 87% | 958 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 65% | 45,484 psi | 87% | 971 fps | 100% |
| Baschieri & Pellagri 106* | <<locked>> | 89% | 25,063 psi | 48% | 1083 fps | 83.6% |
| Hodgdon CFE Pistol² | <<locked>> | 65% | 43,163 psi | 83% | 974 fps | 100% |
| Hodgdon Clays | <<locked>> | 81% | 43,990 psi | 85% | 906 fps | 100% |
| Hodgdon H110² | <<locked>> | 65% | 26,049 psi | 50% | 1125 fps | 97.8% |
| Hodgdon H322* | <<locked>> | 93% | 24,424 psi | 47% | 1106 fps | 81% |
| Hodgdon H4198* | <<locked>> | 85% | 26,382 psi | 51% | 1093 fps | 84% |
| Hodgdon HP38² | <<locked>> | 49% | 42,395 psi | 82% | 951 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 57% | 46,586 psi | 90% | 1099 fps | 100% |
| Hodgdon LilGun² | <<locked>> | 65% | 22,321 psi | 43% | 1102 fps | 100% |
| Hodgdon Longshot² | <<locked>> | 53% | 44,715 psi | 86% | 1073 fps | 100% |
| Hodgdon TiteGroup² | <<locked>> | 49% | 45,121 psi | 87% | 938 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 26,556 psi | 51% | 755 fps | 100% |
| Hodgdon Universal² | <<locked>> | 65% | 45,078 psi | 87% | 991 fps | 100% |
| IMR 4198* | <<locked>> | 89% | 24,714 psi | 48% | 1099 fps | 89.4% |
| IMR 4227* | <<locked>> | 81% | 26,803 psi | 52% | 1115 fps | 93.9% |
| Lovex D032² | <<locked>> | 45% | 41,887 psi | 81% | 951 fps | 100% |
| Lovex D036² | <<locked>> | 49% | 41,176 psi | 79% | 1086 fps | 100% |
| Lovex D037.1² | <<locked>> | 53% | 32,866 psi | 63% | 1099 fps | 100% |
| Lovex D037.2² | <<locked>> | 57% | 30,443 psi | 59% | 1102 fps | 100% |
| Lovex D060*² | <<locked>> | 73% | 26,701 psi | 51% | 1102 fps | 91.4% |
| Lovex D063*² | <<locked>> | 69% | 24,642 psi | 47% | 1079 fps | 90.4% |
| Lovex S011² | <<locked>> | 57% | 42,351 psi | 81% | 945 fps | 100% |
| Lovex S020² | <<locked>> | 61% | 42,743 psi | 82% | 981 fps | 100% |
| Lovex S040² | <<locked>> | 69% | 29,457 psi | 57% | 1102 fps | 100% |
| Lovex S053 | <<locked>> | 81% | 25,614 psi | 49% | 1115 fps | 97.5% |
| Maxam CSB 1² | <<locked>> | 73% | 43,758 psi | 84% | 961 fps | 100% |
| Maxam CSB 2² | <<locked>> | 69% | 44,817 psi | 86% | 965 fps | 100% |
| Maxam CSB 3² | <<locked>> | 69% | 42,975 psi | 83% | 945 fps | 100% |
| Maxam CSB 4² | <<locked>> | 69% | 44,628 psi | 86% | 945 fps | 100% |
| Maxam CSB 5² | <<locked>> | 69% | 46,659 psi | 90% | 928 fps | 100% |
| Norma 200* | <<locked>> | 89% | 21,524 psi | 41% | 1119 fps | 89.1% |
| Ramshot Enforcer² | <<locked>> | 61% | 26,919 psi | 52% | 1093 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 57% | 44,396 psi | 85% | 1043 fps | 100% |
| Ramshot True Blue² | <<locked>> | 53% | 45,905 psi | 88% | 1079 fps | 100% |
| Ramshot Zip² | <<locked>> | 49% | 41,481 psi | 80% | 948 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 61% | 46,412 psi | 89% | 965 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 25,846 psi | 50% | 774 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 69% | 45,339 psi | 87% | 1024 fps | 100% |
| ReloadSwiss RS 24² | <<locked>> | 61% | 36,477 psi | 70% | 1112 fps | 100% |
| ReloadSwiss RS 30² | <<locked>> | 77% | 22,553 psi | 43% | 1093 fps | 99% |
| ReloadSwiss RS 36* | <<locked>> | 81% | 24,656 psi | 47% | 1115 fps | 92.6% |
| Rottweil P 801² | <<locked>> | 57% | 44,396 psi | 85% | 938 fps | 100% |
| Rottweil P 806² | <<locked>> | 65% | 40,799 psi | 78% | 1112 fps | 100% |
| Shooters World Auto Pistol² | <<locked>> | 49% | 41,176 psi | 79% | 1086 fps | 100% |
| Shooters World Blackout*² | <<locked>> | 69% | 24,642 psi | 47% | 1079 fps | 90.4% |
| Shooters World Buffalo Rifle*² | <<locked>> | 73% | 26,701 psi | 51% | 1102 fps | 91.4% |
| Shooters World Clean Shot² | <<locked>> | 45% | 41,887 psi | 81% | 951 fps | 100% |
| Shooters World Heavy Pistol² | <<locked>> | 57% | 30,443 psi | 59% | 1102 fps | 100% |
| Shooters World Major Pistol² | <<locked>> | 53% | 32,866 psi | 63% | 1099 fps | 100% |
| Shooters World SOCOM*² | <<locked>> | 73% | 25,222 psi | 49% | 1086 fps | 91.6% |
| Shooters World Ultimate Pistol² | <<locked>> | 41% | 40,205 psi | 77% | 988 fps | 100% |
| SNPE Vectan A0² | <<locked>> | 73% | 44,556 psi | 86% | 1001 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 69% | 46,992 psi | 90% | 991 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 69% | 46,934 psi | 90% | 1001 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 69% | 45,469 psi | 87% | 922 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 89% | 30,110 psi | 58% | 1122 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 77% | 46,253 psi | 89% | 1079 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 69% | 46,238 psi | 89% | 994 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 57% | 40,248 psi | 77% | 1099 fps | 100% |
| SNPE Vectan SP 3* | <<locked>> | 93% | 25,512 psi | 49% | 1122 fps | 84.5% |
| Somchem MP200² | <<locked>> | 65% | 46,485 psi | 89% | 1047 fps | 100% |
| Somchem MS200² | <<locked>> | 69% | 45,353 psi | 87% | 1020 fps | 100% |
| Somchem S121² | <<locked>> | 41% | 45,397 psi | 87% | 1001 fps | 100% |
| Somchem S221² | <<locked>> | 53% | 38,856 psi | 75% | 1099 fps | 100% |
| Somchem S265² | <<locked>> | 77% | 28,761 psi | 55% | 1099 fps | 97.5% |
| Somchem S335*ᴾ | <<locked>> | 100% | 23,177 psi | 45% | 1096 fps | 82% |
| Vihtavuori 3N37² | <<locked>> | 69% | 46,514 psi | 89% | 1086 fps | 100% |
| Vihtavuori 3N38² | <<locked>> | 73% | 38,232 psi | 74% | 1109 fps | 100% |
| Vihtavuori N105² | <<locked>> | 73% | 37,101 psi | 71% | 1109 fps | 100% |
| Vihtavuori N110² | <<locked>> | 77% | 26,774 psi | 51% | 1109 fps | 100% |
| Vihtavuori N120 | <<locked>> | 85% | 22,771 psi | 44% | 1099 fps | 95% |
| Vihtavuori N130* | <<locked>> | 93% | 23,235 psi | 45% | 1093 fps | 87.2% |
| Vihtavuori N133*ᴾ | <<locked>> | 100% | 25,222 psi | 49% | 1106 fps | 85.3% |
| Vihtavuori N310² | <<locked>> | 57% | 45,701 psi | 88% | 899 fps | 100% |
| Vihtavuori N320² | <<locked>> | 65% | 45,252 psi | 87% | 942 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 45,730 psi | 88% | 896 fps | 100% |
| Vihtavuori N330² | <<locked>> | 61% | 42,134 psi | 81% | 958 fps | 100% |
| Vihtavuori N340² | <<locked>> | 69% | 46,456 psi | 89% | 1024 fps | 100% |
| Vihtavuori N350² | <<locked>> | 73% | 44,759 psi | 86% | 1066 fps | 100% |
| Winchester 231² | <<locked>> | 57% | 44,918 psi | 86% | 974 fps | 100% |
| Winchester 244² | <<locked>> | 49% | 45,078 psi | 87% | 968 fps | 100% |
| Winchester 296² | <<locked>> | 65% | 23,685 psi | 46% | 1112 fps | 95.2% |
| Winchester 572² | <<locked>> | 45% | 41,582 psi | 80% | 1047 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 73% | 47,036 psi | 90% | 1010 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 18"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680*² | <<locked>> | 69% | 16,549 psi | 32% | 942 fps | 81.6% |
| Accurate 2015* | <<locked>> | 89% | 17,535 psi | 34% | 1010 fps | 80.1% |
| Accurate 4100*² | <<locked>> | 37% | 10,196 psi | 20% | 735 fps | 86.6% |
| Accurate 5744*² | <<locked>> | 49% | 14,504 psi | 28% | 856 fps | 80.5% |
| Accurate No. 11 FS*² | <<locked>> | 45% | 10,704 psi | 21% | 771 fps | 80.2% |
| Accurate No. 2² | <<locked>> | 37% | 17,042 psi | 33% | 741 fps | 100% |
| Accurate No. 5² | <<locked>> | 33% | 20,813 psi | 40% | 869 fps | 100% |
| Accurate No. 7² | <<locked>> | 33% | 14,286 psi | 27% | 820 fps | 99.4% |
| Accurate No. 9*² | <<locked>> | 33% | 11,443 psi | 22% | 755 fps | 93.9% |
| Accurate Solo 1000² | <<locked>> | 45% | 23,569 psi | 45% | 751 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 41% | 18,884 psi | 36% | 728 fps | 100% |
| Accurate TCM² | <<locked>> | 33% | 11,661 psi | 22% | 758 fps | 95.1% |
| ADI AP 100² | <<locked>> | 41% | 14,127 psi | 27% | 761 fps | 100% |
| ADI AP 70N² | <<locked>> | 33% | 19,377 psi | 37% | 735 fps | 100% |
| ADI APS 350² | <<locked>> | 49% | 26,353 psi | 51% | 722 fps | 100% |
| ADI APS 450² | <<locked>> | 49% | 25,527 psi | 49% | 741 fps | 100% |
| ADI AR 2205*² | <<locked>> | 45% | 11,124 psi | 21% | 755 fps | 84.7% |
| ADI AR 2207*² | <<locked>> | 65% | 12,821 psi | 25% | 879 fps | 82.3% |
| ADI AR 2219* | <<locked>> | 89% | 23,424 psi | 45% | 1089 fps | 80.2% |
| ADI AS 30² | <<locked>> | 45% | 23,003 psi | 44% | 722 fps | 100% |
| ADI AS 50N² | <<locked>> | 41% | 22,075 psi | 42% | 738 fps | 100% |
| Alliant 2400*² | <<locked>> | 37% | 11,864 psi | 23% | 778 fps | 91.9% |
| Alliant AR-Comp* | <<locked>> | 93% | 19,348 psi | 37% | 1030 fps | 81.2% |
| Alliant BE-86² | <<locked>> | 41% | 19,740 psi | 38% | 738 fps | 100% |
| Alliant BLUE DOT² | <<locked>> | 37% | 11,603 psi | 22% | 741 fps | 96.9% |
| Alliant BULLSEYE² | <<locked>> | 33% | 16,781 psi | 32% | 741 fps | 100% |
| Alliant Herco² | <<locked>> | 41% | 15,302 psi | 29% | 722 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 33% | 14,257 psi | 27% | 784 fps | 100% |
| Alliant Power Pro 300-MP*² | <<locked>> | 37% | 9,471 psi | 18% | 735 fps | 82.7% |
| Alliant RED DOT² | <<locked>> | 45% | 22,829 psi | 44% | 732 fps | 100% |
| Alliant Reloder-10x* | <<locked>> | 81% | 16,563 psi | 32% | 991 fps | 81.3% |
| Alliant Reloder-7*² | <<locked>> | 69% | 14,837 psi | 29% | 925 fps | 81.1% |
| Alliant Sport Pistol² | <<locked>> | 33% | 18,768 psi | 36% | 778 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 37% | 17,114 psi | 33% | 745 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 45% | 23,525 psi | 45% | 751 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 53% | 21,147 psi | 41% | 745 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 41% | 21,654 psi | 42% | 758 fps | 100% |
| Baschieri & Pellagri 106* | <<locked>> | 85% | 22,437 psi | 43% | 1040 fps | 81.6% |
| Hodgdon CFE Pistol² | <<locked>> | 37% | 18,347 psi | 35% | 725 fps | 100% |
| Hodgdon Clays² | <<locked>> | 57% | 26,513 psi | 51% | 748 fps | 100% |
| Hodgdon H110*² | 5.7 gr | 37% | 9,718 psi | 19% | 745 fps | 82.1% |
| Hodgdon H322* | <<locked>> | 93% | 24,424 psi | 47% | 1106 fps | 81% |
| Hodgdon H4198* | <<locked>> | 81% | 23,308 psi | 45% | 1047 fps | 81.8% |
| Hodgdon HP38² | <<locked>> | 33% | 23,438 psi | 45% | 774 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 33% | 18,333 psi | 35% | 810 fps | 100% |
| Hodgdon LilGun*² | 5.5 gr | 37% | 8,354 psi | 16% | 725 fps | 87.3% |
| Hodgdon Longshot² | <<locked>> | 33% | 20,030 psi | 39% | 827 fps | 100% |
| Hodgdon TiteGroup² | <<locked>> | 33% | 25,860 psi | 50% | 768 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 93% | 24,149 psi | 46% | 732 fps | 100% |
| Hodgdon Universal² | <<locked>> | 37% | 19,377 psi | 37% | 735 fps | 100% |
| IMR 4198*² | <<locked>> | 73% | 16,099 psi | 31% | 922 fps | 80.7% |
| IMR 4227*² | <<locked>> | 57% | 13,169 psi | 25% | 837 fps | 81.4% |
| Lovex D032² | <<locked>> | 33% | 25,469 psi | 49% | 807 fps | 100% |
| Lovex D036² | <<locked>> | 33% | 20,784 psi | 40% | 869 fps | 100% |
| Lovex D037.1² | <<locked>> | 33% | 14,286 psi | 27% | 820 fps | 99.4% |
| Lovex D037.2*² | <<locked>> | 33% | 11,748 psi | 23% | 764 fps | 94.3% |
| Lovex D060*² | <<locked>> | 53% | 14,504 psi | 28% | 856 fps | 80.5% |
| Lovex D063*² | <<locked>> | 53% | 14,576 psi | 28% | 873 fps | 80.7% |
| Lovex S011² | <<locked>> | 37% | 21,495 psi | 41% | 748 fps | 100% |
| Lovex S020² | <<locked>> | 37% | 19,087 psi | 37% | 751 fps | 100% |
| Lovex S040*² | <<locked>> | 41% | 11,603 psi | 22% | 771 fps | 91.7% |
| Lovex S053*² | <<locked>> | 49% | 9,979 psi | 19% | 755 fps | 81.9% |
| Maxam CSB 1² | <<locked>> | 45% | 20,595 psi | 40% | 745 fps | 100% |
| Maxam CSB 2² | <<locked>> | 41% | 20,900 psi | 40% | 738 fps | 100% |
| Maxam CSB 3² | <<locked>> | 41% | 20,088 psi | 39% | 722 fps | 100% |
| Maxam CSB 4² | <<locked>> | 45% | 24,308 psi | 47% | 761 fps | 100% |
| Maxam CSB 5² | <<locked>> | 45% | 25,382 psi | 49% | 741 fps | 100% |
| Norma 200*² | <<locked>> | 73% | 13,837 psi | 27% | 942 fps | 80.6% |
| Ramshot Enforcer*² | <<locked>> | 37% | 10,950 psi | 21% | 768 fps | 92.3% |
| Ramshot Silhouette² | <<locked>> | 33% | 18,246 psi | 35% | 774 fps | 100% |
| Ramshot True Blue² | <<locked>> | 33% | 20,073 psi | 39% | 827 fps | 100% |
| Ramshot Zip² | <<locked>> | 33% | 22,902 psi | 44% | 774 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 37% | 22,582 psi | 43% | 745 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 89% | 22,118 psi | 43% | 732 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 37% | 16,650 psi | 32% | 735 fps | 100% |
| ReloadSwiss RS 24² | <<locked>> | 33% | 13,053 psi | 25% | 774 fps | 99.6% |
| ReloadSwiss RS 30*² | <<locked>> | 49% | 10,051 psi | 19% | 764 fps | 85.3% |
| ReloadSwiss RS 36*² | <<locked>> | 61% | 13,764 psi | 26% | 879 fps | 81.9% |
| Rottweil P 801² | <<locked>> | 37% | 23,351 psi | 45% | 741 fps | 100% |
| Rottweil P 806² | <<locked>> | 33% | 12,618 psi | 24% | 751 fps | 100% |
| Shooters World Auto Pistol² | <<locked>> | 33% | 20,784 psi | 40% | 869 fps | 100% |
| Shooters World Blackout*² | <<locked>> | 53% | 14,576 psi | 28% | 873 fps | 80.7% |
| Shooters World Buffalo Rifle*² | <<locked>> | 53% | 14,504 psi | 28% | 856 fps | 80.5% |
| Shooters World Clean Shot² | <<locked>> | 33% | 25,469 psi | 49% | 807 fps | 100% |
| Shooters World Heavy Pistol*² | <<locked>> | 33% | 11,748 psi | 23% | 764 fps | 94.3% |
| Shooters World Major Pistol² | <<locked>> | 33% | 14,286 psi | 27% | 820 fps | 99.4% |
| Shooters World SOCOM*² | <<locked>> | 57% | 15,200 psi | 29% | 889 fps | 82.6% |
| Shooters World Ultimate Pistol² | <<locked>> | 33% | 28,819 psi | 55% | 883 fps | 100% |
| SNPE Vectan A0² | <<locked>> | 41% | 18,173 psi | 35% | 738 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 41% | 21,016 psi | 40% | 751 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 41% | 20,595 psi | 40% | 758 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 45% | 24,598 psi | 47% | 732 fps | 100% |
| SNPE Vectan BA6 1/2*² | <<locked>> | 49% | 10,066 psi | 19% | 745 fps | 93.2% |
| SNPE Vectan BA7 1/2² | <<locked>> | 41% | 15,983 psi | 31% | 761 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 41% | 20,755 psi | 40% | 755 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 33% | 16,317 psi | 31% | 814 fps | 100% |
| SNPE Vectan SP 3* | <<locked>> | 85% | 20,479 psi | 39% | 1030 fps | 80.1% |
| Somchem MP200² | <<locked>> | 33% | 16,012 psi | 31% | 728 fps | 100% |
| Somchem MS200² | <<locked>> | 37% | 17,332 psi | 33% | 732 fps | 100% |
| Somchem S121² | <<locked>> | 33% | 32,300 psi | 62% | 892 fps | 100% |
| Somchem S221² | <<locked>> | 33% | 17,347 psi | 33% | 837 fps | 100% |
| Somchem S265*² | <<locked>> | 45% | 11,153 psi | 21% | 738 fps | 82.8% |
| Somchem S335* | <<locked>> | 97% | 21,466 psi | 41% | 1066 fps | 80.6% |
| Vihtavuori 3N37² | <<locked>> | 37% | 16,288 psi | 31% | 771 fps | 100% |
| Vihtavuori 3N38² | <<locked>> | 37% | 11,951 psi | 23% | 738 fps | 99.4% |
| Vihtavuori N105² | <<locked>> | 37% | 10,979 psi | 21% | 745 fps | 100% |
| Vihtavuori N110*² | <<locked>> | 45% | 9,805 psi | 19% | 751 fps | 90.4% |
| Vihtavuori N120*² | <<locked>> | 61% | 11,879 psi | 23% | 833 fps | 82.3% |
| Vihtavuori N130* | <<locked>> | 81% | 16,665 psi | 32% | 961 fps | 80.8% |
| Vihtavuori N133* | <<locked>> | 93% | 21,190 psi | 41% | 1037 fps | 81.9% |
| Vihtavuori N310² | <<locked>> | 41% | 28,819 psi | 55% | 758 fps | 100% |
| Vihtavuori N320² | <<locked>> | 41% | 22,321 psi | 43% | 738 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 69% | 25,831 psi | 50% | 732 fps | 100% |
| Vihtavuori N330² | <<locked>> | 37% | 19,421 psi | 37% | 738 fps | 100% |
| Vihtavuori N340² | <<locked>> | 37% | 17,071 psi | 33% | 732 fps | 100% |
| Vihtavuori N350² | <<locked>> | 37% | 14,228 psi | 27% | 732 fps | 100% |
| Winchester 231² | <<locked>> | 33% | 19,667 psi | 38% | 732 fps | 100% |
| Winchester 244² | <<locked>> | 33% | 24,569 psi | 47% | 784 fps | 100% |
| Winchester 296*² | 6.3 gr | 41% | 10,196 psi | 20% | 784 fps | 80.3% |
| Winchester 572² | <<locked>> | 33% | 24,526 psi | 47% | 883 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 41% | 19,348 psi | 37% | 748 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
* not dangerous but load has suboptimal powder burnt with possible characteristics such as extensive muzzle flash or inaccurate loads.
² fill rate low - you might want to consider using a filler to ensure proper ignition.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
Subsonic loads are filtered so the start load is at least 220 m/s and the maximum load does not exceed the speed of sound (≈343 m/s).
This overview compares 121 powders for .338 ARC loaded with the .338 | 300gr | MAKER .338 ARC/Spectre Expanding Subsonic in the subsonic range. Accurate 1680 delivers the highest muzzle velocity at 1,125 fps; across all powders the maximum-charge window runs from 755 fps to 1,125 fps. Alliant AR-Comp gives the best case fill at 100 %, and 28 of the 121 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (359 MPa), the top charges use 41–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.338" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Alliant AR-Comp, Hodgdon TrailBoss, ReloadSwiss RS 14 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Hodgdon LilGun, Winchester 296, Hodgdon H110 rank at the top here: for .338 ARC with the .338 | 300gr | MAKER .338 ARC/Spectre Expanding Subsonic they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 1680, Accurate 2015, Accurate 5744 burn incompletely and react more sensitively to barrel length and temperature. Accurate 1680, Accurate 2015, Accurate 4100 stay subsonic at start load. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.