Load Specifications
Load data in caliber .338-378 Weath. Mag. with .338 | 185gr | Fox Classic Hunter bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, IMR 7828 SSC and Norma MRP.
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.
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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 96% | 57,406 psi | 90% | 3199 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 54,592 psi | 86% | 3182 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 56,347 psi | 88% | 3301 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 82% | 55,985 psi | 88% | 3153 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 55,941 psi | 88% | 3245 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 96% | 57,725 psi | 90% | 3310 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,138 psi | 75% | 3120 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,844 psi | 67% | 3071 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,174 psi | 90% | 3176 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,854 psi | 88% | 3251 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 57,087 psi | 89% | 3264 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 55,434 psi | 87% | 3232 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 96% | 57,551 psi | 90% | 3304 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 96% | 54,810 psi | 86% | 3212 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 54,360 psi | 85% | 3274 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 55,303 psi | 87% | 3304 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 56,507 psi | 89% | 3284 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,227 psi | 79% | 3199 fps | 98.1% |
| Bofors RP5 | <<locked>> | 96% | 57,551 psi | 90% | 3304 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 57,319 psi | 90% | 3189 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,316 psi | 84% | 3222 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 86% | 56,724 psi | 89% | 3245 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 55,753 psi | 87% | 3202 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 94% | 57,638 psi | 90% | 3241 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 94% | 56,434 psi | 88% | 3222 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 56,188 psi | 88% | 3163 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,142 psi | 83% | 3340 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 84% | 53,432 psi | 84% | 3215 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,738 psi | 58% | 2054 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,564 psi | 87% | 3173 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,361 psi | 87% | 3159 fps | 99.7% |
| IMR 4831 | <<locked>> | 88% | 55,274 psi | 87% | 3179 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 54,781 psi | 86% | 3163 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 96% | 55,405 psi | 87% | 3284 fps | 98.5% |
| Lovex S065 | <<locked>> | 86% | 55,825 psi | 87% | 3156 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 57,508 psi | 90% | 3205 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,679 psi | 86% | 3156 fps | 100% |
| Norma 204 | <<locked>> | 88% | 56,623 psi | 89% | 3232 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 38,130 psi | 60% | 2976 fps | 96.8% |
| Norma MRP | <<locked>> | 94% | 57,537 psi | 90% | 3327 fps | 99.9% |
| Norma URP | <<locked>> | 88% | 56,985 psi | 89% | 3225 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 56,130 psi | 88% | 3304 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 56,014 psi | 88% | 3232 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 54,563 psi | 86% | 3225 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,565 psi | 59% | 2100 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,565 psi | 89% | 3251 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,868 psi | 86% | 3209 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 57,493 psi | 90% | 3301 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 54,201 psi | 85% | 3340 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 48,921 psi | 77% | 3199 fps | 96.4% |
| Rottweil R 903 | <<locked>> | 82% | 54,766 psi | 86% | 3133 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 57,145 psi | 90% | 3212 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 92% | 54,839 psi | 86% | 3219 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 86% | 57,319 psi | 90% | 3189 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,825 psi | 87% | 3156 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 57,508 psi | 90% | 3205 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 56,608 psi | 89% | 3199 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 54,853 psi | 86% | 3005 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,085 psi | 86% | 3104 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 54,404 psi | 85% | 3212 fps | 99.1% |
| Somchem S355 | <<locked>> | 82% | 54,534 psi | 85% | 3130 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,129 psi | 86% | 3136 fps | 97.7% |
| Somchem S365 | <<locked>> | 90% | 57,566 psi | 90% | 3228 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 55,434 psi | 87% | 3189 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 84% | 55,927 psi | 88% | 3100 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,129 psi | 86% | 3159 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,056 psi | 86% | 3163 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 86% | 54,418 psi | 85% | 3166 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 56,884 psi | 89% | 3241 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 57,334 psi | 90% | 3320 fps | 98.4% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 57,058 psi | 89% | 3291 fps | 98.6% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,940 psi | 86% | 3114 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 56,869 psi | 89% | 3248 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 98% | 56,797 psi | 89% | 3360 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 55,564 psi | 87% | 3182 fps | 99.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 32,518 psi | 51% | 2700 fps | 95.9% |
| Accurate 4350 | <<locked>> | 80% | 44,121 psi | 69% | 2995 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 90% | 48,631 psi | 76% | 3156 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 52,591 psi | 82% | 3097 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 39,610 psi | 62% | 2917 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 88% | 43,526 psi | 68% | 3035 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 96% | 41,901 psi | 66% | 2982 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 94% | 34,940 psi | 55% | 2864 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,693 psi | 84% | 3123 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,598 psi | 67% | 3012 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,327 psi | 77% | 3140 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 39,566 psi | 62% | 2910 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 84% | 37,797 psi | 59% | 2907 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,459 psi | 49% | 2740 fps | 98.9% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,343 psi | 49% | 2756 fps | 96.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 34,418 psi | 54% | 2877 fps | 98.1% |
| Bofors RP15 | <<locked>> | 88% | 40,132 psi | 63% | 2959 fps | 95.8% |
| Bofors RP30 | <<locked>> | 94% | 40,495 psi | 63% | 2995 fps | 95.4% |
| Bofors RP5 | <<locked>> | 84% | 37,797 psi | 59% | 2907 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 47,253 psi | 74% | 3012 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 92% | 40,045 psi | 63% | 2943 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 46,079 psi | 72% | 3054 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 80% | 48,704 psi | 76% | 3071 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 88% | 46,688 psi | 73% | 3045 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 88% | 45,730 psi | 72% | 3025 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,030 psi | 63% | 2884 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 37,594 psi | 59% | 2982 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 45,818 psi | 72% | 3074 fps | 98.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,456 psi | 43% | 1841 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,699 psi | 67% | 2930 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,791 psi | 76% | 3045 fps | 99.1% |
| IMR 4831 | <<locked>> | 80% | 42,221 psi | 66% | 2943 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 45,136 psi | 71% | 2979 fps | 95.5% |
| IMR 7828 SSC | 101.4 gr | 88% | 41,814 psi | 66% | 3009 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 46,137 psi | 72% | 2982 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 44,440 psi | 70% | 2969 fps | 98.6% |
| Lovex S071 | <<locked>> | 84% | 31,923 psi | 50% | 2684 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 42,699 psi | 67% | 2966 fps | 96.4% |
| Norma 217 | <<locked>> | 98% | 35,636 psi | 56% | 2910 fps | 95.7% |
| Norma MRP | 95.7 gr | 80% | 34,243 psi | 54% | 2841 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 43,613 psi | 68% | 2992 fps | 99.7% |
| Ramshot Grand | <<locked>> | 88% | 41,539 psi | 65% | 3012 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 42,467 psi | 67% | 2979 fps | 98.7% |
| Ramshot Magnum | <<locked>> | 88% | 36,999 psi | 58% | 2874 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,021 psi | 44% | 1883 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,489 psi | 82% | 3192 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,266 psi | 69% | 3018 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,685 psi | 67% | 3035 fps | 99.6% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 34,447 psi | 54% | 2881 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 45,179 psi | 71% | 3123 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 51,285 psi | 80% | 3077 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 43,932 psi | 69% | 2963 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 82% | 38,783 psi | 61% | 2894 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 47,253 psi | 74% | 3012 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,137 psi | 72% | 2982 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 44,440 psi | 70% | 2969 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,837 psi | 83% | 3140 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,576 psi | 81% | 2956 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,049 psi | 71% | 2923 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 38,450 psi | 60% | 2887 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 51,213 psi | 80% | 3074 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 44,918 psi | 70% | 2946 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 40,350 psi | 63% | 2936 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,695 psi | 57% | 2808 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 49,066 psi | 77% | 2992 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,962 psi | 70% | 2982 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 36,434 psi | 57% | 2792 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 44,367 psi | 70% | 2982 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 35,230 psi | 55% | 2825 fps | 98.8% |
| Vihtavuori N560 | <<locked>> | 88% | 46,195 psi | 72% | 3110 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 92% | 42,989 psi | 67% | 3018 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,295 psi | 69% | 2940 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,209 psi | 72% | 3054 fps | 98.8% |
| Winchester StaBALL HD | 94.7 gr | 80% | 27,789 psi | 44% | 2730 fps | 98.7% |
| Winchester Supreme 780 | <<locked>> | 84% | 38,754 psi | 61% | 2858 fps | 95.4% |
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 75 powders for .338-378 Weath. Mag. loaded with the .338 | 185gr | Fox Classic Hunter. Winchester StaBALL HD delivers the highest muzzle velocity at 3,360 fps; across all powders the maximum-charge window runs from 2,054 fps to 3,360 fps. ADI AR 2217 gives the best case fill at 100 %, and 75 of the 75 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 185.0 gr projectile in 0.338" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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. Winchester StaBALL HD, IMR 7828 SSC, Norma MRP rank at the top here: for .338-378 Weath. Mag. with the .338 | 185gr | Fox Classic Hunter 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.