Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 165gr | Barnes X BT bullet and 48 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ADI AR 2218 and Vihtavuori N570.
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>> | 84% | 54,389 psi | 85% | 3107 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 56,217 psi | 88% | 3264 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 82% | 54,070 psi | 85% | 3176 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 56,463 psi | 88% | 3258 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 94% | 55,405 psi | 87% | 3232 fps | 99.8% |
| ADI AR 2218 | <<locked>> | 98% | 56,159 psi | 88% | 3353 fps | 98.1% |
| ADI AR 2225 | <<locked>> | 96% | 54,839 psi | 86% | 3261 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,479 psi | 90% | 3228 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 57,305 psi | 90% | 3258 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,622 psi | 87% | 3163 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,941 psi | 88% | 3238 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 56,376 psi | 88% | 3251 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 54,273 psi | 85% | 3268 fps | 97.5% |
| Alliant Reloder-50 | <<locked>> | 98% | 54,868 psi | 86% | 3268 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,463 psi | 88% | 3199 fps | 98.1% |
| Bofors RP15 | <<locked>> | 88% | 56,739 psi | 89% | 3245 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 55,999 psi | 88% | 3255 fps | 99.8% |
| Bofors RP5 | <<locked>> | 86% | 57,305 psi | 90% | 3258 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 56,942 psi | 89% | 3255 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 55,405 psi | 87% | 3179 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 84% | 54,447 psi | 85% | 3163 fps | 99.1% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,071 psi | 86% | 3330 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,014 psi | 60% | 2087 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,709 psi | 87% | 3156 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 86% | 54,984 psi | 86% | 3238 fps | 99.6% |
| IMR 8133 Enduron | <<locked>> | 98% | 54,476 psi | 85% | 3245 fps | 99.7% |
| Lovex S071 | <<locked>> | 90% | 56,275 psi | 88% | 3133 fps | 100% |
| Norma 217 | <<locked>> | 98% | 55,753 psi | 87% | 3271 fps | 100% |
| Norma MRP | <<locked>> | 84% | 57,537 psi | 90% | 3274 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,347 psi | 88% | 3264 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 88% | 55,071 psi | 86% | 3189 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,030 psi | 61% | 2133 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,898 psi | 88% | 3314 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 55,695 psi | 87% | 3281 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 82% | 54,650 psi | 86% | 3143 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 84% | 57,537 psi | 90% | 3225 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 57,145 psi | 90% | 3222 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,043 psi | 88% | 3133 fps | 99.3% |
| Somchem S385 | <<locked>> | 82% | 54,505 psi | 85% | 3133 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,288 psi | 85% | 3117 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 57,406 psi | 90% | 3196 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 82% | 54,375 psi | 85% | 3143 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 56,753 psi | 89% | 3274 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 88% | 54,708 psi | 86% | 3209 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 92% | 56,028 psi | 88% | 3278 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 94% | 57,261 psi | 90% | 3346 fps | 97.8% |
| Winchester StaBALL HD | <<locked>> | 86% | 56,115 psi | 88% | 3261 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 57,537 psi | 90% | 3182 fps | 100% |
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% | 47,906 psi | 75% | 2995 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 49,095 psi | 77% | 3127 fps | 98% |
| ADI AR 2209 | <<locked>> | 80% | 50,749 psi | 80% | 3117 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 46,209 psi | 72% | 3064 fps | 98.3% |
| ADI AR 2217 | <<locked>> | 80% | 35,143 psi | 55% | 2789 fps | 95.2% |
| ADI AR 2218 | 110 gr | 92% | 45,498 psi | 71% | 3123 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 32,764 psi | 51% | 2769 fps | 97.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,720 psi | 79% | 3110 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,268 psi | 74% | 3071 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,035 psi | 72% | 3002 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,248 psi | 63% | 2946 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 52,518 psi | 82% | 3192 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 47,123 psi | 74% | 3127 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 94% | 47,747 psi | 75% | 3127 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,135 psi | 69% | 2953 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 44,121 psi | 69% | 3005 fps | 98.7% |
| Bofors RP30 | <<locked>> | 80% | 38,101 psi | 60% | 2884 fps | 96.6% |
| Bofors RP5 | <<locked>> | 80% | 47,268 psi | 74% | 3071 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 80% | 38,072 psi | 60% | 2874 fps | 97.1% |
| Hodgdon H4831 | <<locked>> | 80% | 48,588 psi | 76% | 3054 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,863 psi | 75% | 3041 fps | 98.1% |
| Hodgdon Retumbo | 90.3 gr | 80% | 39,407 psi | 62% | 2999 fps | 98.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,718 psi | 45% | 1873 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,269 psi | 77% | 3038 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 80% | 45,078 psi | 71% | 3048 fps | 98.1% |
| IMR 8133 Enduron | <<locked>> | 84% | 34,679 psi | 54% | 2812 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 41,742 psi | 65% | 2867 fps | 99.7% |
| Norma 217 | <<locked>> | 80% | 30,908 psi | 48% | 2723 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 50,256 psi | 79% | 3146 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 45,484 psi | 71% | 3061 fps | 98.5% |
| Ramshot Magnum | <<locked>> | 80% | 41,553 psi | 65% | 2936 fps | 99% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,428 psi | 46% | 1916 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,986 psi | 61% | 2976 fps | 99.3% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 38,899 psi | 61% | 2930 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 51,358 psi | 80% | 3084 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 50,662 psi | 79% | 3104 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,299 psi | 79% | 3100 fps | 99.6% |
| Somchem S361 | <<locked>> | 80% | 52,605 psi | 82% | 3074 fps | 98.9% |
| Somchem S385 | <<locked>> | 80% | 51,300 psi | 80% | 3077 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 45,020 psi | 71% | 2946 fps | 99.3% |
| Vihtavuori N170 | <<locked>> | 90% | 53,853 psi | 84% | 3133 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 51,126 psi | 80% | 3087 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,676 psi | 78% | 3143 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 80% | 42,322 psi | 66% | 2959 fps | 97.1% |
| Vihtavuori N568 | <<locked>> | 84% | 42,699 psi | 67% | 3012 fps | 95.9% |
| Vihtavuori N570 | 103.1 gr | 88% | 46,615 psi | 73% | 3133 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,165 psi | 71% | 3081 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,253 psi | 74% | 3002 fps | 99.3% |
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 48 powders for .30-378 Weath. Mag. loaded with the .308 | 165gr | Barnes X BT. ADI AR 2218 delivers the highest muzzle velocity at 3,353 fps; across all powders the maximum-charge window runs from 2,087 fps to 3,353 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 48 of the 48 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14 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, ADI AR 2218, Vihtavuori N570 rank at the top here: for .30-378 Weath. Mag. with the .308 | 165gr | Barnes X BT 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.