Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 165gr | Brenneke TOG bullet and 51 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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>> | 86% | 54,824 psi | 86% | 3127 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 56,695 psi | 89% | 3294 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 84% | 53,838 psi | 84% | 3232 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 84% | 55,883 psi | 88% | 3219 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 54,476 psi | 85% | 3232 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 96% | 57,406 psi | 90% | 3271 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 98% | 53,983 psi | 85% | 3323 fps | 97.8% |
| ADI AR 2225 | <<locked>> | 98% | 56,391 psi | 88% | 3294 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 56,028 psi | 88% | 3215 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,477 psi | 87% | 3205 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,027 psi | 86% | 3228 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,840 psi | 89% | 3192 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,392 psi | 90% | 3268 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 57,725 psi | 90% | 3284 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 55,796 psi | 87% | 3301 fps | 97.9% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,738 psi | 87% | 3287 fps | 97.4% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,100 psi | 86% | 3186 fps | 97.9% |
| Bofors RP15 | <<locked>> | 88% | 54,418 psi | 85% | 3215 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 57,305 psi | 90% | 3284 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 55,027 psi | 86% | 3228 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 54,824 psi | 86% | 3228 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 57,203 psi | 90% | 3225 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,188 psi | 88% | 3205 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,173 psi | 88% | 3123 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 56,550 psi | 89% | 3360 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,753 psi | 59% | 2093 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,450 psi | 90% | 3202 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 88% | 56,710 psi | 89% | 3278 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,347 psi | 87% | 3268 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 56,623 psi | 89% | 3156 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,753 psi | 89% | 3294 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,085 psi | 86% | 3245 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 53,998 psi | 85% | 3235 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 90% | 56,753 psi | 89% | 3225 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,682 psi | 61% | 2139 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 53,388 psi | 84% | 3278 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,101 psi | 89% | 3310 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 84% | 56,202 psi | 88% | 3186 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 84% | 55,303 psi | 87% | 3202 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,926 psi | 86% | 3196 fps | 99.9% |
| Somchem S361 | <<locked>> | 82% | 53,998 psi | 85% | 3110 fps | 99.1% |
| Somchem S385 | <<locked>> | 84% | 55,506 psi | 87% | 3163 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,651 psi | 87% | 3153 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 54,897 psi | 86% | 3166 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 84% | 54,955 psi | 86% | 3166 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,476 psi | 85% | 3245 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 90% | 55,695 psi | 87% | 3238 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 94% | 57,377 psi | 90% | 3310 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 94% | 54,650 psi | 86% | 3304 fps | 97.3% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,508 psi | 90% | 3287 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,361 psi | 87% | 3159 fps | 99.9% |
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% | 44,715 psi | 70% | 2946 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 49,226 psi | 77% | 3153 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 80% | 46,630 psi | 73% | 3087 fps | 97.4% |
| ADI AR 2209 | <<locked>> | 80% | 48,733 psi | 76% | 3091 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 43,990 psi | 69% | 3025 fps | 97.8% |
| ADI AR 2217 | <<locked>> | 82% | 35,172 psi | 55% | 2802 fps | 95.2% |
| ADI AR 2218 | <<locked>> | 94% | 46,470 psi | 73% | 3156 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 30,168 psi | 47% | 2697 fps | 96.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,081 psi | 77% | 3091 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,617 psi | 76% | 3081 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,773 psi | 70% | 3031 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,497 psi | 68% | 2966 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,753 psi | 59% | 2897 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,734 psi | 78% | 3153 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 47,892 psi | 75% | 3150 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 96% | 47,761 psi | 75% | 3133 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 45,179 psi | 71% | 2992 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 41,655 psi | 65% | 2959 fps | 98.2% |
| Bofors RP30 | <<locked>> | 80% | 35,259 psi | 55% | 2818 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 44,773 psi | 70% | 3031 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 80% | 35,679 psi | 56% | 2818 fps | 96.2% |
| Hodgdon H4831 | <<locked>> | 80% | 46,557 psi | 73% | 3025 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,730 psi | 72% | 3009 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,504 psi | 82% | 3068 fps | 100% |
| Hodgdon Retumbo | 92.1 gr | 80% | 36,869 psi | 58% | 2940 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,369 psi | 44% | 1877 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,369 psi | 74% | 3015 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 80% | 42,757 psi | 67% | 3005 fps | 97.6% |
| IMR 8133 Enduron | <<locked>> | 88% | 36,637 psi | 57% | 2874 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 38,508 psi | 60% | 2812 fps | 99.3% |
| Norma 217 | <<locked>> | 82% | 29,950 psi | 47% | 2700 fps | 95% |
| Norma MRP | <<locked>> | 80% | 47,718 psi | 75% | 3110 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 43,047 psi | 67% | 3018 fps | 98% |
| Ramshot Magnum | <<locked>> | 80% | 38,841 psi | 61% | 2884 fps | 98.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,124 psi | 46% | 1923 fps | 100% |
| ReloadSwiss RS 76 | 98.6 gr | 80% | 36,332 psi | 57% | 2910 fps | 98.7% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 38,943 psi | 61% | 2936 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 49,400 psi | 77% | 3061 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 80% | 48,283 psi | 76% | 3071 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,935 psi | 75% | 3068 fps | 99.4% |
| Somchem S361 | <<locked>> | 80% | 50,546 psi | 79% | 3048 fps | 98.6% |
| Somchem S385 | <<locked>> | 80% | 48,675 psi | 76% | 3041 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 42,598 psi | 67% | 2907 fps | 98.9% |
| Vihtavuori N170 | <<locked>> | 90% | 51,401 psi | 81% | 3100 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 48,138 psi | 75% | 3048 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,297 psi | 74% | 3104 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 80% | 39,421 psi | 62% | 2904 fps | 96.2% |
| Vihtavuori N568 | <<locked>> | 86% | 43,004 psi | 67% | 3028 fps | 96% |
| Vihtavuori N570 | 107.6 gr | 90% | 47,340 psi | 74% | 3159 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,235 psi | 66% | 3028 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,962 psi | 70% | 2966 fps | 98.9% |
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 51 powders for .30-378 Weath. Mag. loaded with the .308 | 165gr | Brenneke TOG. Hodgdon Retumbo delivers the highest muzzle velocity at 3,360 fps; across all powders the maximum-charge window runs from 2,093 fps to 3,360 fps. Alliant Reloder-50 gives the best case fill at 100 %, and 51 of the 51 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-50, Hodgdon TrailBoss, IMR 8133 Enduron 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .30-378 Weath. Mag. with the .308 | 165gr | Brenneke TOG 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.