Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 135gr | Atomic 29 FNHP 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% | 54,273 psi | 85% | 3373 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 54,534 psi | 85% | 3412 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 56,188 psi | 88% | 3543 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 90% | 57,580 psi | 90% | 3547 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 88% | 56,101 psi | 88% | 3484 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 90% | 54,404 psi | 85% | 3484 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 56,710 psi | 89% | 3510 fps | 99.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,314 psi | 80% | 3458 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 56,362 psi | 88% | 3478 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,941 psi | 88% | 3484 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 55,709 psi | 87% | 3468 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 90% | 54,679 psi | 86% | 3478 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,115 psi | 88% | 3451 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,289 psi | 88% | 3517 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,058 psi | 89% | 3543 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,695 psi | 87% | 3432 fps | 96.3% |
| Bofors RP15 | <<locked>> | 94% | 57,653 psi | 90% | 3527 fps | 99.5% |
| Bofors RP30 | <<locked>> | 98% | 56,144 psi | 88% | 3517 fps | 99.1% |
| Bofors RP5 | <<locked>> | 90% | 54,679 psi | 86% | 3478 fps | 99.3% |
| Bofors RP7 | <<locked>> | 82% | 56,362 psi | 88% | 3419 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 96% | 54,302 psi | 85% | 3471 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 82% | 56,318 psi | 88% | 3474 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 57,624 psi | 90% | 3481 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,623 psi | 89% | 3465 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 56,086 psi | 88% | 3396 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 55,071 psi | 86% | 3602 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 82% | 57,653 psi | 90% | 3514 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,217 psi | 58% | 2290 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 54,882 psi | 86% | 3399 fps | 99.7% |
| IMR 4831 | <<locked>> | 84% | 55,085 psi | 86% | 3406 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 54,491 psi | 85% | 3396 fps | 98% |
| IMR 7828 SSC | <<locked>> | 92% | 56,347 psi | 88% | 3527 fps | 98.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,514 psi | 73% | 3333 fps | 97.1% |
| Lovex S065 | <<locked>> | 82% | 54,926 psi | 86% | 3379 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,971 psi | 89% | 3435 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 55,767 psi | 87% | 3399 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,246 psi | 88% | 3461 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 46,992 psi | 74% | 3363 fps | 99% |
| Norma MRP | <<locked>> | 88% | 54,520 psi | 85% | 3497 fps | 99.8% |
| Norma URP | <<locked>> | 84% | 56,826 psi | 89% | 3458 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 57,667 psi | 90% | 3553 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 84% | 56,028 psi | 88% | 3461 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,318 psi | 88% | 3468 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,971 psi | 60% | 2339 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 55,027 psi | 86% | 3435 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 53,722 psi | 84% | 3465 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 56,565 psi | 89% | 3593 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,956 psi | 88% | 3533 fps | 98.1% |
| Rottweil R 904 | <<locked>> | 88% | 56,840 psi | 89% | 3448 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 88% | 55,216 psi | 87% | 3455 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 82% | 56,362 psi | 88% | 3419 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 54,926 psi | 86% | 3379 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,971 psi | 89% | 3435 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 54,041 psi | 85% | 3320 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 54,810 psi | 86% | 3448 fps | 99.3% |
| Somchem S361 | <<locked>> | 86% | 54,853 psi | 86% | 3363 fps | 97.9% |
| Somchem S365 | <<locked>> | 84% | 54,099 psi | 85% | 3399 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 55,666 psi | 87% | 3422 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 82% | 54,679 psi | 86% | 3386 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 55,535 psi | 87% | 3399 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 82% | 54,027 psi | 85% | 3386 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 54,056 psi | 85% | 3419 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 54,157 psi | 85% | 3488 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 94% | 54,810 psi | 86% | 3471 fps | 98.3% |
| Vihtavuori N568 | <<locked>> | 98% | 56,420 psi | 88% | 3537 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 54,491 psi | 85% | 3327 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 56,463 psi | 88% | 3478 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 92% | 55,622 psi | 87% | 3540 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 55,738 psi | 87% | 3415 fps | 99.3% |
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% | 38,029 psi | 60% | 3031 fps | 97.8% |
| Accurate 4350 | <<locked>> | 80% | 50,850 psi | 80% | 3343 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 41,945 psi | 66% | 3232 fps | 95.2% |
| Accurate MAGPRO | <<locked>> | 84% | 46,035 psi | 72% | 3310 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 42,409 psi | 66% | 3196 fps | 96.6% |
| ADI AR 2213 | <<locked>> | 84% | 43,656 psi | 68% | 3251 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 92% | 42,641 psi | 67% | 3215 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 88% | 33,460 psi | 52% | 3002 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,786 psi | 67% | 3196 fps | 96.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,863 psi | 77% | 3356 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,395 psi | 66% | 3186 fps | 96.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,232 psi | 60% | 3110 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,898 psi | 58% | 3068 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,778 psi | 50% | 2953 fps | 96.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,510 psi | 65% | 3235 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 52,156 psi | 82% | 3363 fps | 95.3% |
| Bofors RP15 | <<locked>> | 84% | 40,857 psi | 64% | 3176 fps | 96% |
| Bofors RP30 | <<locked>> | 90% | 42,119 psi | 66% | 3219 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 38,232 psi | 60% | 3110 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 52,779 psi | 83% | 3353 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 40,582 psi | 64% | 3166 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 52,562 psi | 82% | 3406 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 84% | 46,673 psi | 73% | 3264 fps | 96% |
| Hodgdon H4831 SC | <<locked>> | 84% | 45,701 psi | 72% | 3241 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,730 psi | 72% | 3209 fps | 100% |
| Hodgdon Retumbo | 101.3 gr | 86% | 38,479 psi | 60% | 3205 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 53,403 psi | 84% | 3438 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,818 psi | 44% | 2057 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,182 psi | 76% | 3271 fps | 98.9% |
| IMR 4831 | <<locked>> | 80% | 48,167 psi | 75% | 3281 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 44,701 psi | 70% | 3189 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 84% | 42,148 psi | 66% | 3225 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 98% | 43,236 psi | 68% | 3261 fps | 96.1% |
| Lovex S065 | <<locked>> | 80% | 51,619 psi | 81% | 3320 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 50,024 psi | 78% | 3307 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 32,460 psi | 51% | 2877 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 48,718 psi | 76% | 3314 fps | 98.1% |
| Norma 217 | <<locked>> | 92% | 34,954 psi | 55% | 3064 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 40,524 psi | 64% | 3192 fps | 97.4% |
| Norma URP | <<locked>> | 80% | 49,661 psi | 78% | 3330 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 42,177 psi | 66% | 3235 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 48,660 psi | 76% | 3323 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 37,782 psi | 59% | 3081 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,427 psi | 45% | 2103 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,271 psi | 80% | 3366 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,792 psi | 78% | 3389 fps | 100% |
| ReloadSwiss RS 76 | 105.9 gr | 84% | 35,288 psi | 55% | 3091 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 47,587 psi | 75% | 3363 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 43,497 psi | 68% | 3173 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 80% | 41,742 psi | 65% | 3169 fps | 96.6% |
| Rottweil R 907 | <<locked>> | 80% | 52,779 psi | 83% | 3353 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,619 psi | 81% | 3320 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 50,024 psi | 78% | 3307 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,604 psi | 79% | 3258 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,408 psi | 65% | 3163 fps | 96.4% |
| Somchem S361 | <<locked>> | 80% | 44,483 psi | 70% | 3153 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 47,021 psi | 74% | 3274 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,221 psi | 66% | 3146 fps | 97.5% |
| Vihtavuori N160 | <<locked>> | 80% | 51,126 psi | 80% | 3323 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,680 psi | 57% | 2992 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 50,459 psi | 79% | 3323 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,147 psi | 64% | 3159 fps | 99.7% |
| Vihtavuori N560 | 100.2 gr | 82% | 43,511 psi | 68% | 3258 fps | 95% |
| Vihtavuori N565 | <<locked>> | 88% | 44,280 psi | 69% | 3245 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 94% | 48,530 psi | 76% | 3379 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,749 psi | 80% | 3268 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,707 psi | 83% | 3406 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,852 psi | 53% | 3084 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,769 psi | 61% | 3054 fps | 95.5% |
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 | 135gr | Atomic 29 FNHP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,602 fps; across all powders the maximum-charge window runs from 2,290 fps to 3,602 fps. ADI AR 2217 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 135.0 gr projectile in 0.308" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, 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, Vihtavuori N560 rank at the top here: for .30-378 Weath. Mag. with the .308 | 135gr | Atomic 29 FNHP 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.