Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | Sellier & Bellot SPCE bullet and 55 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 ReloadSwiss RS 80.
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% | 56,014 psi | 88% | 3268 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 53,969 psi | 85% | 3366 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 86% | 54,998 psi | 86% | 3369 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 86% | 57,116 psi | 90% | 3366 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 55,622 psi | 87% | 3373 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 96% | 54,404 psi | 85% | 3340 fps | 99.4% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,274 psi | 87% | 3448 fps | 97.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 57,348 psi | 90% | 3432 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 57,435 psi | 90% | 3360 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,174 psi | 90% | 3356 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,811 psi | 89% | 3350 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,086 psi | 88% | 3369 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 88% | 54,230 psi | 85% | 3278 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 54,462 psi | 85% | 3346 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,752 psi | 86% | 3363 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,898 psi | 89% | 3432 fps | 97.4% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,478 psi | 89% | 3323 fps | 97.4% |
| Bofors RP15 | <<locked>> | 90% | 55,448 psi | 87% | 3356 fps | 99.7% |
| Bofors RP30 | <<locked>> | 94% | 54,302 psi | 85% | 3353 fps | 99.4% |
| Bofors RP5 | <<locked>> | 88% | 56,086 psi | 88% | 3369 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 94% | 55,941 psi | 88% | 3366 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 86% | 54,752 psi | 86% | 3301 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,522 psi | 90% | 3346 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,305 psi | 90% | 3268 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 57,377 psi | 90% | 3501 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,623 psi | 59% | 2188 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,724 psi | 87% | 3278 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,434 psi | 88% | 3284 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,201 psi | 87% | 3278 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 88% | 54,056 psi | 85% | 3353 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,446 psi | 82% | 3330 fps | 99.1% |
| Lovex S071 | <<locked>> | 92% | 54,244 psi | 85% | 3238 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,014 psi | 89% | 3340 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 53,563 psi | 84% | 3360 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,333 psi | 88% | 3389 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 55,158 psi | 86% | 3376 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 82% | 57,000 psi | 89% | 3337 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 53,853 psi | 84% | 3294 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,479 psi | 60% | 2238 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 54,462 psi | 85% | 3415 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 53,838 psi | 84% | 3366 fps | 98.5% |
| Rottweil R 904 | <<locked>> | 84% | 54,172 psi | 85% | 3268 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 86% | 56,492 psi | 89% | 3343 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,086 psi | 88% | 3337 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 55,535 psi | 87% | 3248 fps | 98.8% |
| Somchem S365 | <<locked>> | 82% | 55,767 psi | 87% | 3278 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,971 psi | 89% | 3307 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,985 psi | 89% | 3291 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 56,014 psi | 88% | 3307 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,767 psi | 87% | 3386 fps | 99% |
| Vihtavuori N565 | <<locked>> | 92% | 56,724 psi | 89% | 3373 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 94% | 54,462 psi | 85% | 3373 fps | 98.1% |
| Vihtavuori N570 | <<locked>> | 96% | 55,564 psi | 87% | 3438 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 54,056 psi | 85% | 3366 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,956 psi | 89% | 3304 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% | 42,699 psi | 67% | 3018 fps | 99.5% |
| Accurate High Country | <<locked>> | 80% | 46,746 psi | 73% | 3219 fps | 97.8% |
| Accurate MAGPRO | <<locked>> | 80% | 44,338 psi | 69% | 3150 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 46,659 psi | 73% | 3163 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 80% | 41,945 psi | 66% | 3087 fps | 96.3% |
| ADI AR 2217 | <<locked>> | 86% | 38,406 psi | 60% | 2992 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 98% | 51,213 psi | 80% | 3366 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 82% | 30,618 psi | 48% | 2802 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 47,036 psi | 74% | 3166 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,461 psi | 84% | 3294 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,601 psi | 73% | 3153 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,670 psi | 67% | 3097 fps | 97.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,292 psi | 65% | 3038 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,781 psi | 56% | 2953 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,050 psi | 74% | 3222 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 48,718 psi | 76% | 3271 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 49,443 psi | 77% | 3189 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 39,711 psi | 62% | 3022 fps | 96.8% |
| Bofors RP30 | <<locked>> | 84% | 38,348 psi | 60% | 3005 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 42,670 psi | 67% | 3097 fps | 97.8% |
| Hodgdon H1000 | <<locked>> | 82% | 36,361 psi | 57% | 2936 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 80% | 44,512 psi | 70% | 3091 fps | 96.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,729 psi | 69% | 3074 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,285 psi | 79% | 3156 fps | 100% |
| Hodgdon Retumbo | 94 gr | 80% | 34,925 psi | 55% | 2982 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,195 psi | 44% | 1965 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,315 psi | 82% | 3219 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 52,866 psi | 83% | 3225 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,600 psi | 71% | 3087 fps | 97% |
| IMR 7828 SSC | <<locked>> | 80% | 40,625 psi | 64% | 3064 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 92% | 39,726 psi | 62% | 3054 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 36,680 psi | 57% | 2877 fps | 98.3% |
| Norma 204 | <<locked>> | 80% | 53,229 psi | 83% | 3271 fps | 99.4% |
| Norma 217 | <<locked>> | 86% | 32,416 psi | 51% | 2871 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 45,310 psi | 71% | 3176 fps | 99.3% |
| Ramshot Grand | <<locked>> | 80% | 40,640 psi | 64% | 3074 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 80% | 53,316 psi | 84% | 3274 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,709 psi | 58% | 2936 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,906 psi | 45% | 2011 fps | 100% |
| ReloadSwiss RS 76 | 100.6 gr | 80% | 34,316 psi | 54% | 2949 fps | 96.9% |
| ReloadSwiss RS 80 | 111.5 gr | 88% | 42,685 psi | 67% | 3130 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 47,500 psi | 74% | 3136 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 80% | 46,180 psi | 72% | 3143 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,832 psi | 72% | 3136 fps | 98.5% |
| Somchem S361 | <<locked>> | 80% | 48,617 psi | 76% | 3120 fps | 97.6% |
| Somchem S365 | <<locked>> | 80% | 52,127 psi | 82% | 3219 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,630 psi | 73% | 3117 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 80% | 40,712 psi | 64% | 2972 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 80% | 45,876 psi | 72% | 3127 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,991 psi | 71% | 3166 fps | 96.7% |
| Vihtavuori N565 | <<locked>> | 82% | 40,089 psi | 63% | 3022 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 88% | 43,642 psi | 68% | 3146 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 94% | 51,706 psi | 81% | 3360 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,465 psi | 62% | 3091 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,960 psi | 67% | 3035 fps | 97.9% |
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 55 powders for .30-378 Weath. Mag. loaded with the .308 | 150gr | Sellier & Bellot SPCE. Hodgdon Retumbo delivers the highest muzzle velocity at 3,501 fps; across all powders the maximum-charge window runs from 2,188 fps to 3,501 fps. ADI AR 2218 gives the best case fill at 100 %, and 55 of the 55 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 150.0 gr projectile in 0.308" calls for a 1:16.0 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. Hodgdon Retumbo, ReloadSwiss RS 76, ReloadSwiss RS 80 rank at the top here: for .30-378 Weath. Mag. with the .308 | 150gr | Sellier & Bellot SPCE 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.