Load Specifications
Load data in caliber .338-378 Weath. Mag. with .338 | 200gr | Barnes Solid bullet and 74 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate High Country, Hodgdon Retumbo and Winchester StaBALL HD.
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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 57,609 psi | 90% | 3097 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 54,795 psi | 86% | 3077 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 55,317 psi | 87% | 3196 fps | 99% |
| Accurate MAGPRO | <<locked>> | 92% | 56,289 psi | 88% | 3199 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 90% | 55,767 psi | 87% | 3136 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 94% | 57,450 psi | 90% | 3202 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,648 psi | 81% | 3094 fps | 98.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,238 psi | 72% | 3054 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 55,898 psi | 88% | 3133 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,637 psi | 87% | 3136 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,884 psi | 89% | 3146 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,230 psi | 87% | 3123 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 94% | 57,537 psi | 90% | 3199 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,085 psi | 86% | 3107 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 54,679 psi | 86% | 3173 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 55,535 psi | 87% | 3199 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,274 psi | 87% | 3094 fps | 96.5% |
| Bofors RP15 | <<locked>> | 96% | 56,536 psi | 89% | 3179 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,331 psi | 85% | 3169 fps | 99.2% |
| Bofors RP5 | <<locked>> | 94% | 57,537 psi | 90% | 3199 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 56,898 psi | 89% | 3077 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,043 psi | 89% | 3186 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 84% | 56,434 psi | 88% | 3133 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 55,245 psi | 87% | 3087 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 57,217 psi | 90% | 3136 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,014 psi | 88% | 3117 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,028 psi | 88% | 3054 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 57,232 psi | 90% | 3310 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,101 psi | 89% | 3169 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,130 psi | 58% | 1978 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,158 psi | 86% | 3061 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 82% | 54,665 psi | 86% | 3045 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 55,114 psi | 86% | 3064 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 54,491 psi | 85% | 3058 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 94% | 55,317 psi | 87% | 3179 fps | 99% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 41,785 psi | 65% | 2949 fps | 96.5% |
| Lovex S065 | <<locked>> | 84% | 55,579 psi | 87% | 3045 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,246 psi | 90% | 3094 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,056 psi | 86% | 3058 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,246 psi | 88% | 3120 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 41,945 psi | 66% | 2976 fps | 98.6% |
| Norma MRP | <<locked>> | 92% | 57,580 psi | 90% | 3219 fps | 100% |
| Norma URP | <<locked>> | 86% | 56,811 psi | 89% | 3114 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,086 psi | 88% | 3199 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 55,840 psi | 88% | 3120 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 54,621 psi | 86% | 3123 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,043 psi | 60% | 2028 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,984 psi | 86% | 3100 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,188 psi | 90% | 3186 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,317 psi | 85% | 3241 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,403 psi | 84% | 3186 fps | 98.1% |
| Rottweil R 904 | <<locked>> | 90% | 56,811 psi | 89% | 3104 fps | 99% |
| Rottweil R 905 | <<locked>> | 90% | 54,737 psi | 86% | 3114 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 84% | 56,898 psi | 89% | 3077 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,579 psi | 87% | 3045 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,246 psi | 90% | 3094 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,725 psi | 90% | 2933 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 54,650 psi | 86% | 2992 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 54,302 psi | 85% | 3107 fps | 99.5% |
| Somchem S361 | <<locked>> | 88% | 54,708 psi | 86% | 3031 fps | 98.2% |
| Somchem S365 | <<locked>> | 88% | 57,580 psi | 90% | 3114 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,303 psi | 87% | 3081 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 55,622 psi | 87% | 2982 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 54,868 psi | 86% | 3048 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 54,955 psi | 86% | 3061 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 84% | 54,201 psi | 85% | 3054 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,217 psi | 90% | 3136 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,276 psi | 90% | 3219 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 98% | 57,450 psi | 90% | 3196 fps | 99.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,389 psi | 85% | 3192 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,534 psi | 85% | 3002 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,579 psi | 89% | 3136 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 57,363 psi | 90% | 3251 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,172 psi | 86% | 3074 fps | 99.5% |
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% | 35,781 psi | 56% | 2690 fps | 97.9% |
| Accurate 4350 | <<locked>> | 80% | 47,776 psi | 75% | 2963 fps | 100% |
| Accurate High Country | 94.4 gr | 80% | 38,769 psi | 61% | 2861 fps | 95% |
| Accurate MAGPRO | <<locked>> | 86% | 45,469 psi | 71% | 2995 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 39,726 psi | 62% | 2825 fps | 96.5% |
| ADI AR 2213 | <<locked>> | 84% | 40,741 psi | 64% | 2877 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 92% | 39,334 psi | 62% | 2835 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 88% | 31,125 psi | 49% | 2664 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 40,147 psi | 63% | 2828 fps | 96.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,571 psi | 71% | 2966 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,924 psi | 83% | 3087 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,784 psi | 62% | 2822 fps | 96.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 35,679 psi | 56% | 2756 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,287 psi | 54% | 2720 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,834 psi | 47% | 2621 fps | 96.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,942 psi | 59% | 2871 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 51,909 psi | 81% | 3031 fps | 95.6% |
| Bofors RP15 | <<locked>> | 82% | 35,534 psi | 56% | 2753 fps | 95% |
| Bofors RP30 | <<locked>> | 90% | 38,450 psi | 60% | 2851 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 35,679 psi | 56% | 2756 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 50,038 psi | 78% | 2963 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 37,579 psi | 59% | 2795 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 49,400 psi | 77% | 3012 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 51,793 psi | 81% | 3028 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 84% | 43,526 psi | 68% | 2884 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 42,728 psi | 67% | 2867 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,989 psi | 67% | 2838 fps | 100% |
| Hodgdon Retumbo | 97.8 gr | 86% | 35,578 psi | 56% | 2838 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 49,226 psi | 77% | 3038 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,833 psi | 44% | 1775 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,498 psi | 71% | 2890 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,401 psi | 81% | 2989 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 45,310 psi | 71% | 2900 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 42,235 psi | 66% | 2822 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 84% | 39,117 psi | 61% | 2851 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 98% | 38,957 psi | 61% | 2881 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 48,965 psi | 77% | 2936 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 47,355 psi | 74% | 2923 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 30,792 psi | 48% | 2559 fps | 96% |
| Norma 204 | <<locked>> | 80% | 45,672 psi | 72% | 2930 fps | 97.9% |
| Norma 217 | <<locked>> | 94% | 34,156 psi | 54% | 2782 fps | 96% |
| Norma MRP | <<locked>> | 80% | 37,376 psi | 59% | 2828 fps | 97.3% |
| Norma URP | <<locked>> | 80% | 46,673 psi | 73% | 2946 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 38,870 psi | 61% | 2858 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 45,513 psi | 71% | 2940 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 34,809 psi | 55% | 2730 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,471 psi | 45% | 1818 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,732 psi | 75% | 2979 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,992 psi | 72% | 3002 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 32,532 psi | 51% | 2740 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 42,322 psi | 66% | 2966 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 41,031 psi | 64% | 2805 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 39,117 psi | 61% | 2805 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 80% | 50,038 psi | 78% | 2963 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,965 psi | 77% | 2936 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 47,355 psi | 74% | 2923 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,317 psi | 85% | 2887 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,008 psi | 75% | 2881 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,783 psi | 61% | 2799 fps | 96.4% |
| Somchem S361 | <<locked>> | 80% | 41,843 psi | 66% | 2789 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 43,816 psi | 69% | 2897 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,755 psi | 62% | 2789 fps | 97.5% |
| Vihtavuori N150 | <<locked>> | 80% | 52,069 psi | 82% | 2933 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,109 psi | 75% | 2936 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,447 psi | 54% | 2651 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 47,558 psi | 75% | 2943 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,464 psi | 60% | 2802 fps | 99.7% |
| Vihtavuori N560 | <<locked>> | 84% | 43,308 psi | 68% | 2953 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 88% | 40,741 psi | 64% | 2874 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 96% | 46,920 psi | 74% | 3051 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,398 psi | 74% | 2890 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,530 psi | 78% | 3015 fps | 99.6% |
| Winchester StaBALL HD | 93.4 gr | 80% | 30,545 psi | 48% | 2740 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,347 psi | 57% | 2707 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 74 powders for .338-378 Weath. Mag. loaded with the .338 | 200gr | Barnes Solid. Hodgdon Retumbo delivers the highest muzzle velocity at 3,310 fps; across all powders the maximum-charge window runs from 1,978 fps to 3,310 fps. ADI AR 2217 gives the best case fill at 100 %, and 74 of the 74 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 200.0 gr projectile in 0.338" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Bofors RP30 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. Accurate High Country, Hodgdon Retumbo, Winchester StaBALL HD rank at the top here: for .338-378 Weath. Mag. with the .338 | 200gr | Barnes Solid 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.