Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 153gr | TWENTY-NINE SILENTIO bullet and 62 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Vihtavuori N570 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% | 54,447 psi | 85% | 3215 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 56,246 psi | 88% | 3383 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 88% | 57,363 psi | 90% | 3389 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 86% | 55,825 psi | 87% | 3317 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 88% | 54,056 psi | 85% | 3323 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 98% | 56,565 psi | 89% | 3356 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 53,287 psi | 84% | 3386 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,303 psi | 87% | 3376 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 56,014 psi | 88% | 3310 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 56,014 psi | 88% | 3310 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,854 psi | 88% | 3310 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,405 psi | 87% | 3301 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 88% | 54,534 psi | 85% | 3320 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 56,304 psi | 88% | 3287 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,478 psi | 89% | 3360 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 57,174 psi | 90% | 3379 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 54,781 psi | 86% | 3373 fps | 96.9% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,027 psi | 86% | 3274 fps | 97.1% |
| Bofors RP15 | <<locked>> | 92% | 57,566 psi | 90% | 3369 fps | 99.9% |
| Bofors RP30 | <<locked>> | 96% | 56,449 psi | 88% | 3369 fps | 99.6% |
| Bofors RP5 | <<locked>> | 88% | 54,534 psi | 85% | 3320 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 94% | 54,157 psi | 85% | 3314 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 88% | 57,246 psi | 90% | 3317 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,057 psi | 88% | 3297 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,927 psi | 88% | 3222 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,521 psi | 87% | 3448 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,565 psi | 59% | 2156 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 54,534 psi | 85% | 3232 fps | 99.9% |
| IMR 4831 | <<locked>> | 82% | 55,114 psi | 86% | 3238 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,566 psi | 90% | 3294 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 90% | 56,202 psi | 88% | 3366 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,531 psi | 79% | 3278 fps | 98.9% |
| Lovex S070 | <<locked>> | 82% | 56,739 psi | 89% | 3268 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,115 psi | 88% | 3245 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,695 psi | 87% | 3291 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 51,401 psi | 81% | 3304 fps | 99.9% |
| Norma MRP | <<locked>> | 86% | 54,607 psi | 86% | 3337 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,637 psi | 89% | 3284 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 57,551 psi | 90% | 3392 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 82% | 55,680 psi | 87% | 3291 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,159 psi | 88% | 3310 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,450 psi | 60% | 2205 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,493 psi | 90% | 3360 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 56,681 psi | 89% | 3435 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 56,043 psi | 88% | 3386 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 86% | 56,347 psi | 88% | 3281 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 86% | 55,114 psi | 86% | 3294 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 82% | 56,739 psi | 89% | 3268 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,261 psi | 90% | 3215 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 54,781 psi | 86% | 3287 fps | 99.7% |
| Somchem S361 | <<locked>> | 84% | 54,273 psi | 85% | 3202 fps | 98.6% |
| Somchem S365 | <<locked>> | 82% | 54,288 psi | 85% | 3232 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,448 psi | 87% | 3258 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,434 psi | 87% | 3241 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 82% | 57,493 psi | 90% | 3281 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 54,505 psi | 85% | 3261 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 54,085 psi | 85% | 3333 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 92% | 55,085 psi | 86% | 3323 fps | 99.1% |
| Vihtavuori N568 | <<locked>> | 96% | 56,463 psi | 88% | 3389 fps | 98.5% |
| Vihtavuori N570 | <<locked>> | 98% | 57,711 psi | 90% | 3455 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 90% | 56,086 psi | 88% | 3379 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,361 psi | 87% | 3251 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% | 41,437 psi | 65% | 2969 fps | 99.3% |
| Accurate High Country | <<locked>> | 80% | 45,353 psi | 71% | 3166 fps | 97.5% |
| Accurate MAGPRO | <<locked>> | 80% | 42,975 psi | 67% | 3094 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 80% | 45,411 psi | 71% | 3114 fps | 98.4% |
| ADI AR 2213 | <<locked>> | 80% | 40,770 psi | 64% | 3038 fps | 96% |
| ADI AR 2217 | <<locked>> | 86% | 37,246 psi | 58% | 2936 fps | 95% |
| ADI AR 2218 | <<locked>> | 98% | 49,443 psi | 77% | 3304 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 84% | 31,778 psi | 50% | 2825 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,818 psi | 72% | 3114 fps | 98.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,818 psi | 72% | 3114 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,243 psi | 82% | 3251 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,397 psi | 71% | 3107 fps | 98.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,452 psi | 65% | 3048 fps | 97.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,190 psi | 63% | 2995 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,650 psi | 54% | 2907 fps | 98.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,484 psi | 71% | 3173 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 50,633 psi | 79% | 3294 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 48,443 psi | 76% | 3143 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 38,493 psi | 60% | 2972 fps | 96.4% |
| Bofors RP30 | <<locked>> | 84% | 37,101 psi | 58% | 2956 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 41,452 psi | 65% | 3048 fps | 97.5% |
| Hodgdon H1000 | <<locked>> | 84% | 38,014 psi | 60% | 2966 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 80% | 43,381 psi | 68% | 3045 fps | 96.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,627 psi | 67% | 3025 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,110 psi | 77% | 3110 fps | 100% |
| Hodgdon Retumbo | 90.6 gr | 80% | 33,852 psi | 53% | 2930 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,166 psi | 44% | 1936 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,068 psi | 80% | 3169 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 51,517 psi | 81% | 3176 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,483 psi | 70% | 3041 fps | 96.7% |
| IMR 7828 SSC | <<locked>> | 80% | 39,450 psi | 62% | 3015 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 92% | 38,276 psi | 60% | 3002 fps | 95.5% |
| Lovex S070 | <<locked>> | 80% | 53,098 psi | 83% | 3202 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,636 psi | 56% | 2828 fps | 98.1% |
| Norma 204 | <<locked>> | 80% | 52,040 psi | 82% | 3225 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 33,475 psi | 52% | 2894 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 43,932 psi | 69% | 3127 fps | 99.1% |
| Norma URP | <<locked>> | 80% | 52,924 psi | 83% | 3225 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,450 psi | 62% | 3025 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 52,098 psi | 82% | 3228 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,418 psi | 56% | 2884 fps | 96.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,892 psi | 45% | 1982 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,461 psi | 84% | 3294 fps | 100% |
| ReloadSwiss RS 76 | 97 gr | 80% | 33,199 psi | 52% | 2900 fps | 96.4% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 41,031 psi | 64% | 3077 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 46,412 psi | 73% | 3087 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 80% | 44,904 psi | 70% | 3094 fps | 98.4% |
| Shooters World SW4350 | <<locked>> | 80% | 53,098 psi | 83% | 3202 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,548 psi | 84% | 3153 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,556 psi | 70% | 3087 fps | 98.3% |
| Somchem S361 | <<locked>> | 80% | 47,398 psi | 74% | 3071 fps | 97.3% |
| Somchem S365 | <<locked>> | 80% | 50,618 psi | 79% | 3173 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,440 psi | 71% | 3068 fps | 99% |
| Vihtavuori N165 | <<locked>> | 80% | 39,581 psi | 62% | 2927 fps | 97.6% |
| Vihtavuori N550 | <<locked>> | 80% | 53,853 psi | 84% | 3219 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,730 psi | 70% | 3081 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,685 psi | 68% | 3117 fps | 96.4% |
| Vihtavuori N565 | <<locked>> | 82% | 38,899 psi | 61% | 2976 fps | 95% |
| Vihtavuori N568 | <<locked>> | 90% | 45,484 psi | 71% | 3173 fps | 95.9% |
| Vihtavuori N570 | 110.5 gr | 94% | 49,821 psi | 78% | 3304 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,942 psi | 59% | 3041 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,872 psi | 66% | 2989 fps | 97.6% |
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 62 powders for .30-378 Weath. Mag. loaded with the .308 | 153gr | TWENTY-NINE SILENTIO. Vihtavuori N570 delivers the highest muzzle velocity at 3,455 fps; across all powders the maximum-charge window runs from 2,156 fps to 3,455 fps. ADI AR 2218 gives the best case fill at 100 %, and 62 of the 62 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 153.0 gr projectile in 0.308" calls for a 1:12.0 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, Vihtavuori N570, ReloadSwiss RS 76 rank at the top here: for .30-378 Weath. Mag. with the .308 | 153gr | TWENTY-NINE SILENTIO 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.