Load Specifications
Load data in caliber .338-378 Weath. Mag. with .338 | 220gr | Reichenberg HDB Universal 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 IMR 7828 SSC.
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% | 57,087 psi | 89% | 2976 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 54,027 psi | 85% | 2946 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 56,144 psi | 88% | 3084 fps | 99% |
| ADI AR 2209 | <<locked>> | 88% | 55,317 psi | 87% | 3015 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 92% | 57,145 psi | 90% | 3084 fps | 99.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,288 psi | 87% | 3048 fps | 99.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,574 psi | 78% | 3009 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,492 psi | 87% | 3005 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 54,781 psi | 86% | 3002 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 57,261 psi | 90% | 3074 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 55,027 psi | 86% | 2982 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 54,955 psi | 86% | 3054 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 55,608 psi | 87% | 3074 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 52,315 psi | 82% | 3064 fps | 97% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 54,607 psi | 86% | 2982 fps | 97.5% |
| Bofors RP15 | <<locked>> | 94% | 56,420 psi | 88% | 3061 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 54,491 psi | 85% | 3058 fps | 99.7% |
| Bofors RP5 | <<locked>> | 92% | 57,261 psi | 90% | 3074 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 55,898 psi | 88% | 2949 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 56,884 psi | 89% | 3074 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 55,724 psi | 87% | 3005 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 56,666 psi | 89% | 3018 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 55,492 psi | 87% | 2999 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,463 psi | 87% | 2923 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 57,595 psi | 90% | 3196 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 56,478 psi | 89% | 3041 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,260 psi | 58% | 1900 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 54,331 psi | 85% | 2936 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,392 psi | 90% | 2969 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 54,462 psi | 85% | 2936 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 57,217 psi | 90% | 2995 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 92% | 55,172 psi | 86% | 3061 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,962 psi | 70% | 2910 fps | 98.4% |
| Lovex S065 | <<locked>> | 82% | 54,650 psi | 86% | 2913 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,376 psi | 88% | 2966 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 54,723 psi | 86% | 2940 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,477 psi | 87% | 2995 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 45,527 psi | 71% | 2936 fps | 99.8% |
| Norma MRP | <<locked>> | 90% | 57,421 psi | 90% | 3097 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,173 psi | 88% | 2982 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 56,144 psi | 88% | 3084 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 55,230 psi | 87% | 2992 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 54,578 psi | 86% | 3009 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,189 psi | 60% | 1946 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 54,375 psi | 85% | 2969 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,855 psi | 89% | 3058 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 54,505 psi | 85% | 3123 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 53,679 psi | 84% | 3077 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 88% | 56,115 psi | 88% | 2982 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 88% | 54,418 psi | 85% | 2992 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 55,898 psi | 88% | 2949 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 54,650 psi | 86% | 2913 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,376 psi | 88% | 2966 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,290 psi | 90% | 2920 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,682 psi | 90% | 3045 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 57,725 psi | 90% | 2972 fps | 99.3% |
| Somchem S365 | <<locked>> | 86% | 57,246 psi | 90% | 2982 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 54,708 psi | 86% | 2959 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 54,230 psi | 85% | 2920 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 54,607 psi | 86% | 2943 fps | 100% |
| Vihtavuori N170 | <<locked>> | 98% | 57,246 psi | 90% | 3015 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 84% | 56,985 psi | 89% | 2976 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,971 psi | 89% | 3009 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 57,058 psi | 89% | 3097 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 96% | 57,174 psi | 90% | 3077 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 98% | 54,476 psi | 85% | 3081 fps | 98.6% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 55,550 psi | 87% | 3143 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,696 psi | 90% | 2923 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,869 psi | 88% | 3005 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 53,809 psi | 84% | 3068 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 54,592 psi | 86% | 2956 fps | 99.8% |
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% | 37,623 psi | 59% | 2635 fps | 99.1% |
| Accurate 4350 | <<locked>> | 80% | 50,372 psi | 79% | 2887 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 42,003 psi | 66% | 2818 fps | 96% |
| ADI AR 2209 | <<locked>> | 80% | 42,018 psi | 66% | 2772 fps | 98.2% |
| ADI AR 2213 | <<locked>> | 80% | 37,449 psi | 59% | 2700 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 88% | 36,361 psi | 57% | 2671 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 84% | 28,732 psi | 45% | 2503 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,414 psi | 76% | 2897 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,003 psi | 66% | 2766 fps | 98.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,840 psi | 59% | 2710 fps | 97.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,492 psi | 57% | 2661 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,473 psi | 49% | 2579 fps | 98.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,712 psi | 64% | 2818 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 48,370 psi | 76% | 2992 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 45,150 psi | 71% | 2802 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 35,143 psi | 55% | 2641 fps | 96% |
| Bofors RP30 | <<locked>> | 86% | 35,694 psi | 56% | 2680 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 37,840 psi | 59% | 2710 fps | 97.2% |
| Bofors RP7 | <<locked>> | 80% | 52,373 psi | 82% | 2890 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 34,606 psi | 54% | 2628 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 52,112 psi | 82% | 2946 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 40,016 psi | 63% | 2707 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 39,305 psi | 62% | 2694 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,455 psi | 71% | 2769 fps | 100% |
| Hodgdon Retumbo | 94 gr | 82% | 32,909 psi | 52% | 2667 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 52,417 psi | 82% | 2979 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,876 psi | 44% | 1699 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,790 psi | 75% | 2825 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,824 psi | 84% | 2917 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,747 psi | 75% | 2831 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,495 psi | 65% | 2707 fps | 96.5% |
| IMR 7828 SSC | 91.6 gr | 80% | 36,100 psi | 57% | 2677 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 94% | 36,434 psi | 57% | 2720 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 51,198 psi | 80% | 2861 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,588 psi | 78% | 2858 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 32,198 psi | 50% | 2503 fps | 97.7% |
| Norma 204 | <<locked>> | 80% | 48,298 psi | 76% | 2874 fps | 99.2% |
| Norma 217 | <<locked>> | 88% | 29,660 psi | 46% | 2556 fps | 95% |
| Norma MRP | <<locked>> | 80% | 39,958 psi | 63% | 2782 fps | 98.9% |
| Norma URP | <<locked>> | 80% | 49,226 psi | 77% | 2874 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 35,766 psi | 56% | 2680 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 48,225 psi | 76% | 2877 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 31,879 psi | 50% | 2559 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,529 psi | 45% | 1742 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,662 psi | 79% | 2913 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,139 psi | 77% | 2940 fps | 100% |
| ReloadSwiss RS 76 | 98.1 gr | 80% | 29,718 psi | 47% | 2562 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 39,160 psi | 61% | 2795 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 43,134 psi | 68% | 2749 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 80% | 41,379 psi | 65% | 2753 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 80% | 52,373 psi | 82% | 2890 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,198 psi | 80% | 2861 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,588 psi | 78% | 2858 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,154 psi | 79% | 2812 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,046 psi | 64% | 2746 fps | 98.1% |
| Somchem S361 | <<locked>> | 80% | 44,034 psi | 69% | 2736 fps | 97% |
| Somchem S365 | <<locked>> | 80% | 46,543 psi | 73% | 2825 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,858 psi | 66% | 2730 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 80% | 50,705 psi | 79% | 2864 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,332 psi | 57% | 2602 fps | 97.3% |
| Vihtavuori N170 | <<locked>> | 96% | 53,345 psi | 84% | 2949 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 50,024 psi | 78% | 2871 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,712 psi | 64% | 2740 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 39,958 psi | 63% | 2772 fps | 96% |
| Vihtavuori N565 | <<locked>> | 84% | 37,652 psi | 59% | 2703 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 90% | 40,538 psi | 64% | 2812 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 96% | 47,834 psi | 75% | 3002 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,995 psi | 78% | 2818 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,257 psi | 82% | 2946 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,373 psi | 52% | 2697 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,392 psi | 60% | 2657 fps | 97.3% |
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 | 220gr | Reichenberg HDB Universal. Hodgdon Retumbo delivers the highest muzzle velocity at 3,196 fps; across all powders the maximum-charge window runs from 1,900 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 220.0 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-33 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, IMR 7828 SSC rank at the top here: for .338-378 Weath. Mag. with the .338 | 220gr | Reichenberg HDB Universal 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.