Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 165gr | Barnes X FN bullet and 52 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Vihtavuori N570 and Hodgdon Retumbo.
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% | 55,347 psi | 87% | 3120 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,806 psi | 78% | 3117 fps | 96% |
| Accurate High Country | <<locked>> | 82% | 56,463 psi | 88% | 3278 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 84% | 57,479 psi | 90% | 3284 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 82% | 55,056 psi | 86% | 3196 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 57,580 psi | 90% | 3278 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 94% | 56,782 psi | 89% | 3251 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 98% | 57,421 psi | 90% | 3376 fps | 98.5% |
| ADI AR 2225 | <<locked>> | 96% | 56,391 psi | 88% | 3284 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 55,361 psi | 87% | 3192 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,839 psi | 86% | 3186 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,810 psi | 86% | 3215 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,768 psi | 89% | 3176 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,101 psi | 89% | 3251 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 57,711 psi | 90% | 3271 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,825 psi | 87% | 3294 fps | 97.9% |
| Alliant Reloder-50 | <<locked>> | 98% | 56,565 psi | 89% | 3294 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 57,595 psi | 90% | 3222 fps | 98.4% |
| Bofors RP15 | <<locked>> | 86% | 54,389 psi | 85% | 3205 fps | 99.9% |
| Bofors RP30 | <<locked>> | 92% | 57,435 psi | 90% | 3278 fps | 99.9% |
| Bofors RP5 | <<locked>> | 84% | 54,810 psi | 86% | 3215 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 90% | 54,331 psi | 85% | 3212 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 84% | 56,434 psi | 88% | 3199 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,492 psi | 87% | 3186 fps | 99.3% |
| Hodgdon Retumbo | <<locked>> | 90% | 56,463 psi | 88% | 3353 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,043 psi | 60% | 2093 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,536 psi | 89% | 3173 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 86% | 56,101 psi | 88% | 3258 fps | 99.7% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,811 psi | 87% | 3268 fps | 99.8% |
| Lovex S071 | <<locked>> | 90% | 57,392 psi | 90% | 3153 fps | 100% |
| Norma 217 | <<locked>> | 98% | 57,203 psi | 90% | 3294 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,897 psi | 86% | 3232 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 57,580 psi | 90% | 3284 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 88% | 56,449 psi | 88% | 3209 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,189 psi | 61% | 2142 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 57,406 psi | 90% | 3333 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 57,188 psi | 90% | 3304 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 82% | 55,550 psi | 87% | 3163 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 82% | 54,926 psi | 86% | 3182 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 52,011 psi | 82% | 3136 fps | 96.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,549 psi | 85% | 3176 fps | 99.9% |
| Somchem S361 | <<locked>> | 82% | 57,116 psi | 90% | 3153 fps | 99.5% |
| Somchem S385 | <<locked>> | 82% | 55,535 psi | 87% | 3150 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,288 psi | 87% | 3133 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 55,013 psi | 86% | 3156 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 82% | 55,448 psi | 87% | 3156 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 54,114 psi | 85% | 3225 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 88% | 55,883 psi | 88% | 3232 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 92% | 57,319 psi | 90% | 3301 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 92% | 54,911 psi | 86% | 3301 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 86% | 57,493 psi | 90% | 3278 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,882 psi | 86% | 3143 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% | 48,878 psi | 77% | 3012 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 46,441 psi | 73% | 3051 fps | 95% |
| Accurate High Country | <<locked>> | 80% | 52,837 psi | 83% | 3212 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 80% | 50,183 psi | 79% | 3150 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 80% | 51,750 psi | 81% | 3136 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 47,152 psi | 74% | 3081 fps | 98.5% |
| ADI AR 2217 | <<locked>> | 80% | 35,911 psi | 56% | 2812 fps | 95.7% |
| ADI AR 2218 | 112 gr | 92% | 46,528 psi | 73% | 3146 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 33,504 psi | 53% | 2792 fps | 97.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 52,141 psi | 82% | 3136 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,663 psi | 81% | 3127 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 48,211 psi | 76% | 3091 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 47,065 psi | 74% | 3018 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 41,220 psi | 65% | 2966 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 53,737 psi | 84% | 3209 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 45,005 psi | 71% | 3077 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 94% | 49,095 psi | 77% | 3153 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,759 psi | 70% | 2972 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 45,078 psi | 71% | 3022 fps | 98.9% |
| Bofors RP30 | <<locked>> | 80% | 39,030 psi | 61% | 2904 fps | 97% |
| Bofors RP5 | <<locked>> | 80% | 48,211 psi | 76% | 3091 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 80% | 38,870 psi | 61% | 2890 fps | 97.5% |
| Hodgdon H4831 | <<locked>> | 80% | 49,603 psi | 78% | 3074 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,747 psi | 76% | 3058 fps | 98.3% |
| Hodgdon Retumbo | 92 gr | 80% | 40,335 psi | 63% | 3022 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,674 psi | 45% | 1877 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,082 psi | 78% | 3058 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 80% | 46,006 psi | 72% | 3064 fps | 98.4% |
| IMR 8133 Enduron | <<locked>> | 84% | 35,534 psi | 56% | 2831 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 42,554 psi | 67% | 2887 fps | 99.8% |
| Norma 217 | <<locked>> | 80% | 31,705 psi | 50% | 2743 fps | 96.2% |
| Norma MRP | <<locked>> | 80% | 51,285 psi | 80% | 3166 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,514 psi | 73% | 3084 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 80% | 42,453 psi | 67% | 2953 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,501 psi | 46% | 1923 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,943 psi | 63% | 2999 fps | 99.5% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 39,958 psi | 63% | 2953 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 52,272 psi | 82% | 3104 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 80% | 51,605 psi | 81% | 3123 fps | 99.8% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 48,834 psi | 77% | 3074 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 51,256 psi | 80% | 3117 fps | 99.7% |
| Somchem S361 | <<locked>> | 80% | 53,447 psi | 84% | 3087 fps | 99.1% |
| Somchem S385 | <<locked>> | 80% | 52,214 psi | 82% | 3094 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,847 psi | 72% | 2963 fps | 99.4% |
| Vihtavuori N170 | <<locked>> | 88% | 51,561 psi | 81% | 3094 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 52,156 psi | 82% | 3107 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,589 psi | 79% | 3159 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 80% | 43,163 psi | 68% | 2979 fps | 97.4% |
| Vihtavuori N568 | <<locked>> | 82% | 40,828 psi | 64% | 2966 fps | 95.4% |
| Vihtavuori N570 | 105 gr | 88% | 47,819 psi | 75% | 3159 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,354 psi | 73% | 3097 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 48,095 psi | 75% | 3018 fps | 99.4% |
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 52 powders for .30-378 Weath. Mag. loaded with the .308 | 165gr | Barnes X FN. ADI AR 2218 delivers the highest muzzle velocity at 3,376 fps; across all powders the maximum-charge window runs from 2,093 fps to 3,376 fps. Accurate 8700 gives the best case fill at 100 %, and 52 of the 52 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 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, 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. ADI AR 2218, Vihtavuori N570, Hodgdon Retumbo rank at the top here: for .30-378 Weath. Mag. with the .308 | 165gr | Barnes X FN 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.