Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 146.6gr | Sax KDG-S bullet and 69 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 Vihtavuori N560.
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>> | 90% | 55,376 psi | 87% | 3291 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,680 psi | 87% | 3323 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 57,493 psi | 90% | 3465 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 88% | 54,476 psi | 85% | 3392 fps | 98% |
| ADI AR 2209 | <<locked>> | 88% | 57,217 psi | 90% | 3396 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 90% | 55,448 psi | 87% | 3402 fps | 99% |
| ADI AR 2217 | <<locked>> | 98% | 53,969 psi | 85% | 3366 fps | 99.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,446 psi | 82% | 3386 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 57,319 psi | 90% | 3392 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,130 psi | 90% | 3396 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,637 psi | 89% | 3383 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,709 psi | 87% | 3396 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,319 psi | 90% | 3363 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,566 psi | 90% | 3435 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 54,027 psi | 85% | 3389 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,956 psi | 88% | 3448 fps | 96.8% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,536 psi | 89% | 3353 fps | 97% |
| Bofors RP15 | <<locked>> | 92% | 54,897 psi | 86% | 3379 fps | 99.5% |
| Bofors RP30 | <<locked>> | 98% | 57,363 psi | 90% | 3442 fps | 99.6% |
| Bofors RP5 | <<locked>> | 90% | 55,709 psi | 87% | 3396 fps | 99.7% |
| Bofors RP7 | <<locked>> | 82% | 57,232 psi | 90% | 3330 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 96% | 55,579 psi | 87% | 3392 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 82% | 57,551 psi | 90% | 3389 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,853 psi | 86% | 3330 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,566 psi | 90% | 3379 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,290 psi | 90% | 3304 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,492 psi | 89% | 3524 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,289 psi | 58% | 2195 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 55,956 psi | 88% | 3314 fps | 99.9% |
| IMR 4831 | <<locked>> | 84% | 56,260 psi | 88% | 3317 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,434 psi | 87% | 3314 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 92% | 57,537 psi | 90% | 3448 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,630 psi | 75% | 3271 fps | 98% |
| Lovex S065 | <<locked>> | 82% | 55,941 psi | 88% | 3291 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 54,302 psi | 85% | 3284 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,927 psi | 89% | 3314 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,261 psi | 90% | 3376 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 48,254 psi | 76% | 3301 fps | 99.6% |
| Norma MRP | <<locked>> | 88% | 55,840 psi | 88% | 3419 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,172 psi | 85% | 3307 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 54,694 psi | 86% | 3399 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 84% | 57,072 psi | 89% | 3373 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 57,609 psi | 90% | 3392 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,101 psi | 60% | 2247 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,217 psi | 88% | 3350 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,897 psi | 86% | 3379 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 53,534 psi | 84% | 3442 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 57,246 psi | 90% | 3465 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 86% | 54,201 psi | 85% | 3297 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 88% | 56,333 psi | 88% | 3373 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 82% | 57,232 psi | 90% | 3330 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,941 psi | 88% | 3291 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 54,302 psi | 85% | 3284 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 54,955 psi | 86% | 3235 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,927 psi | 88% | 3366 fps | 99.7% |
| Somchem S361 | <<locked>> | 86% | 55,709 psi | 87% | 3281 fps | 98.6% |
| Somchem S365 | <<locked>> | 84% | 55,390 psi | 87% | 3310 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,637 psi | 89% | 3333 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 82% | 55,724 psi | 87% | 3297 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,695 psi | 89% | 3317 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 82% | 55,158 psi | 86% | 3301 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,332 psi | 87% | 3333 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,405 psi | 87% | 3412 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 94% | 55,883 psi | 88% | 3389 fps | 98.9% |
| Vihtavuori N568 | <<locked>> | 98% | 57,638 psi | 90% | 3465 fps | 98.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,550 psi | 87% | 3241 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,711 psi | 90% | 3392 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,072 psi | 89% | 3455 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,753 psi | 89% | 3333 fps | 99.7% |
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% | 38,986 psi | 61% | 2963 fps | 98.6% |
| Accurate 4350 | <<locked>> | 80% | 52,011 psi | 82% | 3261 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 42,917 psi | 67% | 3163 fps | 96.3% |
| Accurate MAGPRO | <<locked>> | 82% | 43,700 psi | 68% | 3166 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 43,366 psi | 68% | 3123 fps | 97.5% |
| ADI AR 2213 | <<locked>> | 82% | 41,640 psi | 65% | 3110 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 90% | 40,582 psi | 64% | 3074 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 86% | 31,952 psi | 50% | 2877 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,743 psi | 69% | 3123 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,864 psi | 78% | 3268 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,337 psi | 68% | 3114 fps | 97.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,218 psi | 61% | 3045 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,826 psi | 59% | 2995 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,590 psi | 51% | 2894 fps | 97.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,699 psi | 67% | 3169 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 51,590 psi | 81% | 3363 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 49,748 psi | 78% | 3222 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 36,347 psi | 57% | 2966 fps | 95% |
| Bofors RP30 | <<locked>> | 88% | 40,118 psi | 63% | 3081 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 39,218 psi | 61% | 3045 fps | 96.4% |
| Bofors RP7 | <<locked>> | 80% | 53,650 psi | 84% | 3264 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 38,551 psi | 60% | 3025 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 53,606 psi | 84% | 3320 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 80% | 41,350 psi | 65% | 3048 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 82% | 43,598 psi | 68% | 3100 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,789 psi | 73% | 3127 fps | 100% |
| Hodgdon Retumbo | 95.7 gr | 84% | 36,637 psi | 57% | 3064 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,934 psi | 44% | 1972 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,110 psi | 77% | 3189 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 49,182 psi | 77% | 3196 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,670 psi | 67% | 3051 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 82% | 40,074 psi | 63% | 3081 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 94% | 38,319 psi | 60% | 3051 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 52,504 psi | 82% | 3232 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,937 psi | 80% | 3222 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 33,228 psi | 52% | 2815 fps | 96.8% |
| Norma 204 | <<locked>> | 80% | 49,734 psi | 78% | 3235 fps | 98.7% |
| Norma 217 | <<locked>> | 90% | 33,431 psi | 52% | 2936 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 41,495 psi | 65% | 3127 fps | 98.3% |
| Norma URP | <<locked>> | 80% | 50,691 psi | 79% | 3245 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 40,089 psi | 63% | 3091 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 49,705 psi | 78% | 3241 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 82% | 35,882 psi | 56% | 2946 fps | 96.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,485 psi | 45% | 2014 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,344 psi | 82% | 3284 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,966 psi | 80% | 3307 fps | 100% |
| ReloadSwiss RS 76 | 100 gr | 82% | 33,446 psi | 52% | 2956 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 44,991 psi | 71% | 3219 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 44,353 psi | 70% | 3097 fps | 96.7% |
| Rottweil R 905 | <<locked>> | 80% | 42,685 psi | 67% | 3097 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 80% | 53,650 psi | 84% | 3264 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,504 psi | 82% | 3232 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,937 psi | 80% | 3222 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,474 psi | 81% | 3173 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,395 psi | 66% | 3094 fps | 97.4% |
| Somchem S361 | <<locked>> | 80% | 45,353 psi | 71% | 3081 fps | 96.4% |
| Somchem S365 | <<locked>> | 80% | 48,153 psi | 75% | 3189 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,207 psi | 68% | 3074 fps | 98.3% |
| Vihtavuori N160 | <<locked>> | 80% | 52,199 psi | 82% | 3238 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,521 psi | 59% | 2927 fps | 96.5% |
| Vihtavuori N550 | <<locked>> | 80% | 51,430 psi | 81% | 3235 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,105 psi | 66% | 3084 fps | 100% |
| Vihtavuori N560 | 94.6 gr | 80% | 41,394 psi | 65% | 3114 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 86% | 42,090 psi | 66% | 3104 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 92% | 46,079 psi | 72% | 3235 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,793 psi | 81% | 3182 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,766 psi | 84% | 3323 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,012 psi | 55% | 3025 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,610 psi | 62% | 2989 fps | 96.5% |
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 69 powders for .30-378 Weath. Mag. loaded with the .308 | 146.6gr | Sax KDG-S. Hodgdon Retumbo delivers the highest muzzle velocity at 3,524 fps; across all powders the maximum-charge window runs from 2,195 fps to 3,524 fps. ADI AR 2225 gives the best case fill at 100 %, and 69 of the 69 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 146.6 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-33, 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, Vihtavuori N560 rank at the top here: for .30-378 Weath. Mag. with the .308 | 146.6gr | Sax KDG-S 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.