Load Specifications
Load data in caliber .338-378 Weath. Mag. with .338 | 210gr | Fox Classic Hunter bullet and 71 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 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>> | 92% | 53,969 psi | 85% | 2986 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 54,926 psi | 86% | 3015 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 56,869 psi | 89% | 3150 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 90% | 56,188 psi | 88% | 3084 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 54,041 psi | 85% | 3087 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,996 psi | 81% | 3048 fps | 99.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,615 psi | 73% | 3005 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,188 psi | 88% | 3077 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,261 psi | 90% | 3087 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,622 psi | 87% | 3071 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 54,201 psi | 85% | 3084 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,506 psi | 87% | 3051 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,129 psi | 86% | 3117 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,086 psi | 88% | 3143 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,622 psi | 87% | 3045 fps | 97% |
| Bofors RP15 | <<locked>> | 96% | 57,014 psi | 89% | 3127 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,694 psi | 86% | 3117 fps | 99.5% |
| Bofors RP5 | <<locked>> | 92% | 54,201 psi | 85% | 3084 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 57,000 psi | 89% | 3018 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,566 psi | 90% | 3136 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 84% | 56,710 psi | 89% | 3077 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 55,521 psi | 87% | 3031 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 92% | 57,696 psi | 90% | 3087 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,521 psi | 89% | 3068 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,449 psi | 88% | 2995 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 53,998 psi | 85% | 3196 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,609 psi | 90% | 3117 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,072 psi | 58% | 1932 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,434 psi | 87% | 3005 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 54,984 psi | 86% | 2989 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 55,405 psi | 87% | 3009 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 54,781 psi | 86% | 3009 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 94% | 55,898 psi | 88% | 3130 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 41,872 psi | 66% | 2897 fps | 97.1% |
| Lovex S065 | <<locked>> | 84% | 55,579 psi | 87% | 2986 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,508 psi | 90% | 3038 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,158 psi | 86% | 3002 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,608 psi | 89% | 3068 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 42,061 psi | 66% | 2923 fps | 99% |
| Norma MRP | <<locked>> | 90% | 54,012 psi | 85% | 3104 fps | 100% |
| Norma URP | <<locked>> | 86% | 57,174 psi | 90% | 3058 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,811 psi | 89% | 3150 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 86% | 56,173 psi | 88% | 3064 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,129 psi | 86% | 3074 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,971 psi | 60% | 1978 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,172 psi | 86% | 3041 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,740 psi | 90% | 3130 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,911 psi | 86% | 3189 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,012 psi | 85% | 3136 fps | 98.6% |
| Rottweil R 904 | <<locked>> | 90% | 57,130 psi | 90% | 3051 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 90% | 55,216 psi | 87% | 3061 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 84% | 57,000 psi | 89% | 3018 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,579 psi | 87% | 2986 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,508 psi | 90% | 3038 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 54,839 psi | 86% | 2940 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 54,795 psi | 86% | 3054 fps | 99.7% |
| Somchem S361 | <<locked>> | 88% | 54,998 psi | 86% | 2982 fps | 98.6% |
| Somchem S365 | <<locked>> | 86% | 54,128 psi | 85% | 3002 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,535 psi | 87% | 3028 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 55,622 psi | 87% | 2923 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,245 psi | 87% | 2995 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,288 psi | 87% | 3009 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 54,346 psi | 85% | 2995 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,450 psi | 90% | 3077 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 53,780 psi | 84% | 3100 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 96% | 53,882 psi | 84% | 3077 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,737 psi | 86% | 3140 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,897 psi | 86% | 2946 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,855 psi | 89% | 3077 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 53,751 psi | 84% | 3133 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,579 psi | 87% | 3025 fps | 99.7% |
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% | 35,462 psi | 56% | 2635 fps | 98.2% |
| Accurate 4350 | <<locked>> | 80% | 47,718 psi | 75% | 2904 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 42,395 psi | 66% | 2877 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 80% | 39,827 psi | 62% | 2776 fps | 97% |
| ADI AR 2213 | <<locked>> | 82% | 38,000 psi | 60% | 2762 fps | 95% |
| ADI AR 2217 | <<locked>> | 92% | 39,392 psi | 62% | 2789 fps | 96% |
| ADI AR 2225 | <<locked>> | 88% | 30,951 psi | 49% | 2615 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,992 psi | 72% | 2913 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,403 psi | 84% | 3031 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,871 psi | 62% | 2772 fps | 97.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 35,650 psi | 56% | 2707 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,229 psi | 54% | 2664 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,660 psi | 46% | 2572 fps | 96.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,942 psi | 59% | 2815 fps | 99.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 49,008 psi | 77% | 2927 fps | 95.4% |
| Bofors RP15 | <<locked>> | 82% | 35,418 psi | 56% | 2697 fps | 95.5% |
| Bofors RP30 | <<locked>> | 88% | 35,882 psi | 56% | 2736 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 35,650 psi | 56% | 2707 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 50,125 psi | 79% | 2907 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 88% | 37,579 psi | 59% | 2749 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 49,501 psi | 78% | 2956 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 52,054 psi | 82% | 2976 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 82% | 40,625 psi | 64% | 2769 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 82% | 39,900 psi | 63% | 2753 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,221 psi | 68% | 2785 fps | 100% |
| Hodgdon Retumbo | 94.8 gr | 84% | 33,214 psi | 52% | 2720 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 49,647 psi | 78% | 2989 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,789 psi | 44% | 1732 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,643 psi | 72% | 2838 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,619 psi | 81% | 2933 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 45,353 psi | 71% | 2844 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 39,595 psi | 62% | 2713 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 84% | 39,276 psi | 62% | 2805 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 96% | 36,448 psi | 57% | 2769 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 48,979 psi | 77% | 2877 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 47,340 psi | 74% | 2871 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 30,356 psi | 48% | 2503 fps | 96.4% |
| Norma 204 | <<locked>> | 80% | 45,876 psi | 72% | 2881 fps | 98.4% |
| Norma 217 | <<locked>> | 92% | 31,763 psi | 50% | 2664 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 37,463 psi | 59% | 2779 fps | 97.8% |
| Norma URP | <<locked>> | 80% | 46,789 psi | 73% | 2887 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 39,044 psi | 61% | 2812 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 45,745 psi | 72% | 2887 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 32,155 psi | 50% | 2608 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,311 psi | 44% | 1772 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,906 psi | 75% | 2923 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,325 psi | 73% | 2949 fps | 100% |
| ReloadSwiss RS 76 | 101.5 gr | 84% | 32,401 psi | 51% | 2694 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 42,598 psi | 67% | 2923 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 41,075 psi | 64% | 2753 fps | 96.3% |
| Rottweil R 905 | <<locked>> | 80% | 39,146 psi | 61% | 2756 fps | 97% |
| Rottweil R 907 | <<locked>> | 80% | 50,125 psi | 79% | 2907 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,979 psi | 77% | 2877 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 47,340 psi | 74% | 2871 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,051 psi | 75% | 2825 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,812 psi | 61% | 2749 fps | 96.9% |
| Somchem S361 | <<locked>> | 80% | 41,930 psi | 66% | 2743 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 43,932 psi | 69% | 2841 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,682 psi | 62% | 2736 fps | 97.9% |
| Vihtavuori N150 | <<locked>> | 80% | 52,156 psi | 82% | 2874 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,298 psi | 76% | 2884 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,360 psi | 54% | 2602 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 47,543 psi | 75% | 2884 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,319 psi | 60% | 2743 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 40,364 psi | 63% | 2835 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 88% | 40,727 psi | 64% | 2825 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 94% | 43,903 psi | 69% | 2936 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,558 psi | 75% | 2838 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,632 psi | 78% | 2959 fps | 99.8% |
| Winchester StaBALL HD | 92.7 gr | 80% | 30,530 psi | 48% | 2687 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,230 psi | 57% | 2654 fps | 95.9% |
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 71 powders for .338-378 Weath. Mag. loaded with the .338 | 210gr | Fox Classic Hunter. Hodgdon Retumbo delivers the highest muzzle velocity at 3,196 fps; across all powders the maximum-charge window runs from 1,932 fps to 3,196 fps. ADI AR 2217 gives the best case fill at 100 %, and 71 of the 71 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 210.0 gr projectile in 0.338" calls for a 1:12.5 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. Hodgdon Retumbo, ReloadSwiss RS 76, Winchester StaBALL HD rank at the top here: for .338-378 Weath. Mag. with the .338 | 210gr | 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.