Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 156gr | Reichenbeg HDB Ogival bullet and 61 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>> | 88% | 54,056 psi | 85% | 3192 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 56,159 psi | 88% | 3363 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 88% | 57,217 psi | 90% | 3366 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 86% | 55,695 psi | 87% | 3294 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 54,085 psi | 85% | 3301 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 98% | 56,782 psi | 89% | 3337 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 53,229 psi | 83% | 3369 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,434 psi | 87% | 3353 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 55,999 psi | 88% | 3291 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,782 psi | 87% | 3287 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,376 psi | 87% | 3281 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 54,462 psi | 85% | 3294 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 56,217 psi | 88% | 3261 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,608 psi | 89% | 3337 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 57,029 psi | 89% | 3353 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 54,737 psi | 86% | 3353 fps | 97.1% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,216 psi | 87% | 3258 fps | 97.4% |
| Bofors RP15 | <<locked>> | 92% | 57,508 psi | 90% | 3346 fps | 99.9% |
| Bofors RP30 | <<locked>> | 96% | 56,275 psi | 88% | 3343 fps | 99.7% |
| Bofors RP5 | <<locked>> | 88% | 54,462 psi | 85% | 3294 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 94% | 54,302 psi | 85% | 3294 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 88% | 57,246 psi | 90% | 3297 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,072 psi | 88% | 3274 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,898 psi | 88% | 3199 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,521 psi | 87% | 3425 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,449 psi | 59% | 2139 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 54,389 psi | 85% | 3209 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 54,795 psi | 86% | 3209 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,580 psi | 90% | 3274 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 90% | 56,405 psi | 88% | 3350 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,473 psi | 79% | 3251 fps | 99% |
| Lovex S070 | <<locked>> | 82% | 56,405 psi | 88% | 3241 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 55,912 psi | 88% | 3219 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,695 psi | 87% | 3271 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 51,314 psi | 80% | 3281 fps | 100% |
| Norma MRP | <<locked>> | 86% | 54,491 psi | 85% | 3310 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,449 psi | 88% | 3261 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 53,374 psi | 84% | 3297 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 82% | 55,637 psi | 87% | 3268 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,217 psi | 88% | 3291 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,305 psi | 60% | 2188 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,566 psi | 90% | 3337 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 56,840 psi | 89% | 3415 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,970 psi | 88% | 3363 fps | 99% |
| Rottweil R 904 | <<locked>> | 86% | 56,391 psi | 88% | 3261 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 86% | 54,897 psi | 86% | 3268 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 82% | 56,405 psi | 88% | 3241 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,971 psi | 89% | 3192 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 54,505 psi | 85% | 3261 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 54,157 psi | 85% | 3182 fps | 98.8% |
| Somchem S365 | <<locked>> | 82% | 54,027 psi | 85% | 3202 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,245 psi | 87% | 3235 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,317 psi | 87% | 3219 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 82% | 57,392 psi | 90% | 3255 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 54,273 psi | 85% | 3232 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 54,027 psi | 85% | 3310 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 92% | 54,824 psi | 86% | 3297 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 96% | 56,434 psi | 88% | 3366 fps | 98.6% |
| Vihtavuori N570 | <<locked>> | 96% | 53,577 psi | 84% | 3360 fps | 96.4% |
| Winchester StaBALL HD | <<locked>> | 90% | 56,014 psi | 88% | 3350 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,274 psi | 87% | 3232 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% | 40,944 psi | 64% | 2940 fps | 99.3% |
| Accurate High Country | <<locked>> | 80% | 45,179 psi | 71% | 3143 fps | 97.6% |
| Accurate MAGPRO | <<locked>> | 80% | 42,728 psi | 67% | 3071 fps | 95.6% |
| ADI AR 2209 | <<locked>> | 80% | 45,353 psi | 71% | 3094 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 40,640 psi | 64% | 3018 fps | 96.2% |
| ADI AR 2217 | <<locked>> | 86% | 36,999 psi | 58% | 2913 fps | 95.2% |
| ADI AR 2218 | <<locked>> | 98% | 49,371 psi | 77% | 3284 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 84% | 31,372 psi | 49% | 2795 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,716 psi | 72% | 3091 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,156 psi | 82% | 3228 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,281 psi | 71% | 3084 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,220 psi | 65% | 3022 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,856 psi | 62% | 2966 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,345 psi | 54% | 2877 fps | 98.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,223 psi | 71% | 3143 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 50,546 psi | 79% | 3271 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 48,356 psi | 76% | 3123 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 38,232 psi | 60% | 2946 fps | 96.5% |
| Bofors RP30 | <<locked>> | 84% | 36,767 psi | 58% | 2927 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 41,220 psi | 65% | 3022 fps | 97.6% |
| Hodgdon H1000 | <<locked>> | 82% | 35,143 psi | 55% | 2867 fps | 95.1% |
| Hodgdon H4831 | <<locked>> | 80% | 43,250 psi | 68% | 3022 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,467 psi | 67% | 3005 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,892 psi | 77% | 3084 fps | 100% |
| Hodgdon Retumbo | 91.2 gr | 80% | 33,533 psi | 53% | 2904 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,094 psi | 44% | 1919 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,039 psi | 80% | 3146 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 51,329 psi | 80% | 3153 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,396 psi | 70% | 3018 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 39,276 psi | 62% | 2992 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 92% | 37,913 psi | 59% | 2972 fps | 95.6% |
| Lovex S070 | <<locked>> | 80% | 52,939 psi | 83% | 3179 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,954 psi | 55% | 2795 fps | 98% |
| Norma 204 | <<locked>> | 80% | 51,851 psi | 81% | 3202 fps | 99.4% |
| Norma 217 | <<locked>> | 88% | 33,025 psi | 52% | 2858 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 43,729 psi | 69% | 3100 fps | 99.2% |
| Norma URP | <<locked>> | 80% | 52,866 psi | 83% | 3202 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,117 psi | 61% | 2999 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 80% | 51,880 psi | 81% | 3202 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,085 psi | 55% | 2858 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,660 psi | 45% | 1962 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,490 psi | 84% | 3271 fps | 100% |
| ReloadSwiss RS 76 | 97.6 gr | 80% | 32,793 psi | 51% | 2871 fps | 96.5% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 40,814 psi | 64% | 3051 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 46,209 psi | 72% | 3068 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 80% | 44,715 psi | 70% | 3071 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 80% | 52,939 psi | 83% | 3179 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,388 psi | 84% | 3133 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,411 psi | 70% | 3064 fps | 98.4% |
| Somchem S361 | <<locked>> | 80% | 47,224 psi | 74% | 3051 fps | 97.5% |
| Somchem S365 | <<locked>> | 80% | 50,488 psi | 79% | 3146 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,179 psi | 71% | 3045 fps | 99.1% |
| Vihtavuori N165 | <<locked>> | 80% | 39,334 psi | 62% | 2904 fps | 97.7% |
| Vihtavuori N550 | <<locked>> | 80% | 53,548 psi | 84% | 3196 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,237 psi | 69% | 3051 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,526 psi | 68% | 3091 fps | 96.5% |
| Vihtavuori N565 | <<locked>> | 82% | 38,479 psi | 60% | 2946 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 90% | 45,252 psi | 71% | 3146 fps | 96.1% |
| Vihtavuori N570 | 111.2 gr | 94% | 49,806 psi | 78% | 3281 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,579 psi | 59% | 3009 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,495 psi | 65% | 2963 fps | 97.7% |
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 61 powders for .30-378 Weath. Mag. loaded with the .308 | 156gr | Reichenbeg HDB Ogival. Hodgdon Retumbo delivers the highest muzzle velocity at 3,425 fps; across all powders the maximum-charge window runs from 2,139 fps to 3,425 fps. ADI AR 2218 gives the best case fill at 100 %, and 61 of the 61 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 156.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Hodgdon TrailBoss 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 | 156gr | Reichenbeg HDB Ogival 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.