Load Specifications
Load data in caliber .33 Win. with .338 | 250gr | Swift A-Frame bullet and 56 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 and IMR 3031.
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 ≥ 80% and propellant combustion ≥ 95%. 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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 82% | 37,565 psi | 85% | 2005 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 38,363 psi | 87% | 2080 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 39,247 psi | 89% | 2110 fps | 99.3% |
| Accurate 4064 | <<locked>> | 92% | 38,479 psi | 87% | 2106 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 38,957 psi | 88% | 2083 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 92% | 40,001 psi | 90% | 2083 fps | 96% |
| ADI Benchmark 8208 | <<locked>> | 84% | 39,001 psi | 88% | 2060 fps | 97.9% |
| Alliant AR-Comp | <<locked>> | 86% | 39,450 psi | 89% | 2100 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 38,189 psi | 86% | 2096 fps | 97.5% |
| Alliant Reloder-15 | <<locked>> | 90% | 39,189 psi | 89% | 2110 fps | 96.1% |
| Alliant Reloder-17 | <<locked>> | 96% | 38,392 psi | 87% | 2156 fps | 96.5% |
| Bofors RP3 | <<locked>> | 92% | 37,420 psi | 85% | 2100 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 38,812 psi | 88% | 2018 fps | 98.3% |
| Hodgdon BL-C2 | <<locked>> | 86% | 38,827 psi | 88% | 2113 fps | 98.5% |
| Hodgdon H322 | <<locked>> | 82% | 38,334 psi | 87% | 2057 fps | 99.9% |
| Hodgdon H4895 | <<locked>> | 86% | 39,131 psi | 88% | 2093 fps | 97.3% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 39,682 psi | 90% | 2149 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,692 psi | 76% | 1309 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 39,668 psi | 90% | 2087 fps | 97.3% |
| IMR 3031 | <<locked>> | 90% | 38,885 psi | 88% | 2119 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 38,798 psi | 88% | 2057 fps | 96% |
| IMR 4895 | <<locked>> | 88% | 37,550 psi | 85% | 2093 fps | 96.4% |
| IMR 8208 XBR | <<locked>> | 84% | 39,001 psi | 88% | 2060 fps | 97.9% |
| Lovex D073.6 | <<locked>> | 88% | 39,247 psi | 89% | 2110 fps | 99.3% |
| Lovex S060 | <<locked>> | 84% | 38,218 psi | 86% | 2005 fps | 96.3% |
| Lovex S062 | <<locked>> | 90% | 38,595 psi | 87% | 2073 fps | 97.9% |
| Norma 201 | <<locked>> | 86% | 38,203 psi | 86% | 2051 fps | 97.8% |
| Norma 202 | <<locked>> | 86% | 38,058 psi | 86% | 2064 fps | 99.5% |
| Norma 203B | <<locked>> | 90% | 38,435 psi | 87% | 2100 fps | 96.6% |
| Ramshot Big Game | <<locked>> | 90% | 38,377 psi | 87% | 2110 fps | 96.1% |
| Ramshot Wild Boar | <<locked>> | 86% | 40,001 psi | 90% | 2113 fps | 96.8% |
| Ramshot X-Terminator | <<locked>> | 82% | 39,755 psi | 90% | 2054 fps | 96.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,910 psi | 77% | 1342 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 38,319 psi | 87% | 2169 fps | 98.9% |
| Rottweil R 901 | <<locked>> | 84% | 39,668 psi | 90% | 2054 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 88% | 38,479 psi | 87% | 2047 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 96% | 39,958 psi | 90% | 2133 fps | 97.7% |
| Shooters World Match Rifle | <<locked>> | 88% | 39,247 psi | 89% | 2110 fps | 99.3% |
| Shooters World Precision | <<locked>> | 90% | 38,595 psi | 87% | 2073 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 39,566 psi | 89% | 2139 fps | 96.5% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 37,594 psi | 85% | 2060 fps | 96.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 38,247 psi | 86% | 1988 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 39,581 psi | 89% | 2028 fps | 99.9% |
| Somchem S321 | <<locked>> | 82% | 38,682 psi | 87% | 2080 fps | 98.1% |
| Somchem S335 | <<locked>> | 86% | 39,595 psi | 90% | 2028 fps | 99.9% |
| Somchem S341 | <<locked>> | 86% | 38,580 psi | 87% | 2070 fps | 96.3% |
| Somchem S355 | <<locked>> | 94% | 38,624 psi | 87% | 2096 fps | 97.1% |
| Somchem S365ᴾ | <<locked>> | 100% | 33,373 psi | 75% | 2070 fps | 96.6% |
| Vihtavuori N133 | <<locked>> | 84% | 38,101 psi | 86% | 1991 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 39,146 psi | 88% | 2077 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 38,377 psi | 87% | 2051 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 96% | 39,653 psi | 90% | 2090 fps | 98.5% |
| Vihtavuori N530 | <<locked>> | 84% | 38,827 psi | 88% | 2054 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 90% | 39,102 psi | 88% | 2080 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 38,667 psi | 87% | 2070 fps | 96.5% |
| Winchester 748 | <<locked>> | 82% | 37,521 psi | 85% | 2090 fps | 98.4% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 35,389 psi | 80% | 1969 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 27,673 psi | 63% | 1890 fps | 99.5% |
| Accurate 2520 | <<locked>> | 80% | 31,879 psi | 72% | 1982 fps | 97.8% |
| Accurate 4064 | <<locked>> | 80% | 26,252 psi | 59% | 1870 fps | 97.1% |
| ADI AR 2206H | <<locked>> | 82% | 34,534 psi | 78% | 2001 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 90% | 37,550 psi | 85% | 2041 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 34,287 psi | 78% | 1975 fps | 96.6% |
| Alliant AR-Comp | <<locked>> | 80% | 32,590 psi | 74% | 1988 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 31,662 psi | 72% | 1975 fps | 95.5% |
| Alliant Reloder-15 | <<locked>> | 88% | 36,738 psi | 83% | 2067 fps | 95.4% |
| Alliant Reloder-17 | 43.1 gr | 94% | 35,853 psi | 81% | 2106 fps | 95.6% |
| Bofors RP3 | <<locked>> | 86% | 30,647 psi | 69% | 1972 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 36,724 psi | 83% | 1982 fps | 97.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 31,705 psi | 72% | 1982 fps | 96.6% |
| Hodgdon H322 | <<locked>> | 80% | 36,114 psi | 82% | 2021 fps | 99.7% |
| Hodgdon H4895 | <<locked>> | 80% | 32,489 psi | 73% | 1969 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 31,140 psi | 70% | 1982 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,092 psi | 57% | 1171 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 33,243 psi | 75% | 1969 fps | 95.3% |
| IMR 3031 | 32.7 gr | 80% | 28,514 psi | 64% | 1923 fps | 99% |
| IMR 4064 | <<locked>> | 90% | 36,622 psi | 83% | 2021 fps | 95.3% |
| IMR 4895 | <<locked>> | 84% | 33,214 psi | 75% | 2011 fps | 95% |
| IMR 8208 XBR | <<locked>> | 80% | 34,287 psi | 78% | 1975 fps | 96.6% |
| Lovex D073.6 | <<locked>> | 80% | 30,037 psi | 68% | 1942 fps | 97.2% |
| Lovex S060 | <<locked>> | 82% | 35,853 psi | 81% | 1962 fps | 95.6% |
| Lovex S062 | <<locked>> | 82% | 30,269 psi | 68% | 1916 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 31,691 psi | 72% | 1929 fps | 95.9% |
| Norma 202 | <<locked>> | 80% | 31,459 psi | 71% | 1942 fps | 98.2% |
| Norma 203B | <<locked>> | 86% | 33,765 psi | 76% | 2014 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 88% | 35,839 psi | 81% | 2064 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 82% | 35,027 psi | 79% | 2024 fps | 95.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 37,391 psi | 85% | 2014 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,106 psi | 57% | 1198 fps | 100% |
| ReloadSwiss RS 60 | 39.5 gr | 86% | 29,921 psi | 68% | 1985 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 35,433 psi | 80% | 1978 fps | 98.8% |
| Rottweil R 902 | <<locked>> | 80% | 30,400 psi | 69% | 1893 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 90% | 32,924 psi | 74% | 2008 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 30,037 psi | 68% | 1942 fps | 97.2% |
| Shooters World Precision | <<locked>> | 82% | 30,269 psi | 68% | 1916 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 34,954 psi | 79% | 2054 fps | 95% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 35,288 psi | 80% | 2018 fps | 95.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 33,707 psi | 76% | 1913 fps | 98.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 27,340 psi | 62% | 1808 fps | 97.9% |
| Somchem S321 | <<locked>> | 80% | 36,303 psi | 82% | 2037 fps | 97.5% |
| Somchem S335 | <<locked>> | 80% | 32,967 psi | 75% | 1916 fps | 99.1% |
| Somchem S341 | <<locked>> | 84% | 36,201 psi | 82% | 2028 fps | 95.6% |
| Somchem S355 | <<locked>> | 88% | 32,300 psi | 73% | 1978 fps | 95.1% |
| Somchem S365 | <<locked>> | 98% | 31,546 psi | 71% | 2031 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 33,576 psi | 76% | 1919 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 80% | 28,616 psi | 65% | 1893 fps | 99.5% |
| Vihtavuori N140 | <<locked>> | 80% | 29,747 psi | 67% | 1893 fps | 98.1% |
| Vihtavuori N150 | <<locked>> | 86% | 28,790 psi | 65% | 1890 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 33,997 psi | 77% | 1972 fps | 96.6% |
| Vihtavuori N540 | <<locked>> | 80% | 28,631 psi | 65% | 1886 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 36,390 psi | 82% | 2031 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 35,186 psi | 80% | 2047 fps | 97.9% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 56 powders for .33 Win. loaded with the .338 | 250gr | Swift A-Frame. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,169 fps; across all powders the maximum-charge window runs from 1,309 fps to 2,169 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 56 of the 56 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (305 MPa), the top charges use 75–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, Somchem S365 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. ReloadSwiss RS 60, Alliant Reloder-17, IMR 3031 rank at the top here: for .33 Win. with the .338 | 250gr | Swift A-Frame they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.