Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 190gr | TWENTY-NINE ERTP bullet and 54 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ADI AR 2218 and Vihtavuori N570.
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>> | 86% | 56,608 psi | 89% | 2966 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 47,558 psi | 75% | 2927 fps | 96.6% |
| Accurate High Country | <<locked>> | 82% | 54,621 psi | 86% | 3074 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 84% | 55,579 psi | 87% | 3081 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 84% | 57,464 psi | 90% | 3054 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 56,260 psi | 88% | 3077 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 55,347 psi | 87% | 3058 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 55,680 psi | 87% | 3186 fps | 99.1% |
| ADI AR 2225 | <<locked>> | 96% | 54,636 psi | 86% | 3081 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 57,653 psi | 90% | 3054 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 57,653 psi | 90% | 3054 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,043 psi | 89% | 3045 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,768 psi | 89% | 3071 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,071 psi | 86% | 2972 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,448 psi | 87% | 3051 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,593 psi | 87% | 3061 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 57,667 psi | 90% | 3163 fps | 99% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 57,580 psi | 90% | 3153 fps | 98.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,420 psi | 88% | 3035 fps | 98.9% |
| Bofors RP15 | <<locked>> | 88% | 56,144 psi | 88% | 3061 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 55,317 psi | 87% | 3071 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 56,768 psi | 89% | 3071 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 56,797 psi | 89% | 3077 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 55,056 psi | 86% | 3005 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 54,056 psi | 85% | 2989 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 90% | 54,839 psi | 86% | 3143 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,869 psi | 59% | 1939 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,274 psi | 87% | 2982 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 86% | 54,824 psi | 86% | 3061 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 92% | 57,493 psi | 90% | 2986 fps | 96.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 57,450 psi | 90% | 3123 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 54,868 psi | 86% | 2943 fps | 100% |
| Norma 217 | <<locked>> | 98% | 54,839 psi | 86% | 3084 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,811 psi | 89% | 3084 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,072 psi | 88% | 3084 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 54,389 psi | 85% | 3005 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,885 psi | 61% | 1985 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,564 psi | 87% | 3130 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 54,839 psi | 86% | 3097 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 54,201 psi | 85% | 2966 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 84% | 56,898 psi | 89% | 3038 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 49,719 psi | 78% | 2943 fps | 96.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,521 psi | 89% | 3031 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 55,506 psi | 87% | 2959 fps | 99.8% |
| Somchem S385 | <<locked>> | 84% | 57,217 psi | 90% | 3002 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 57,246 psi | 90% | 2989 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,565 psi | 89% | 3025 fps | 97.6% |
| Vihtavuori N555 | <<locked>> | 84% | 56,811 psi | 89% | 2999 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 56,173 psi | 88% | 3091 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 90% | 57,493 psi | 90% | 3087 fps | 100% |
| Vihtavuori N568 | <<locked>> | 92% | 55,245 psi | 87% | 3097 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 94% | 56,637 psi | 89% | 3166 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 86% | 55,521 psi | 87% | 3064 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 57,101 psi | 89% | 3005 fps | 100% |
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% | 46,253 psi | 72% | 2802 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 44,266 psi | 69% | 2861 fps | 95.6% |
| Accurate High Country | <<locked>> | 80% | 51,024 psi | 80% | 3009 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 80% | 48,341 psi | 76% | 2949 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 80% | 50,386 psi | 79% | 2940 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 45,629 psi | 72% | 2890 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 80% | 34,026 psi | 53% | 2621 fps | 96.3% |
| ADI AR 2218 | 102.8 gr | 90% | 41,568 psi | 65% | 2887 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 31,372 psi | 49% | 2592 fps | 98.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 50,575 psi | 79% | 2936 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 50,575 psi | 79% | 2936 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,096 psi | 79% | 2930 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,398 psi | 73% | 2890 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,194 psi | 71% | 2815 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,334 psi | 62% | 2766 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,634 psi | 81% | 2999 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 42,757 psi | 67% | 2881 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 92% | 42,670 psi | 67% | 2871 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,540 psi | 68% | 2795 fps | 96.2% |
| Bofors RP15 | <<locked>> | 80% | 43,178 psi | 68% | 2825 fps | 99.3% |
| Bofors RP30 | <<locked>> | 80% | 36,709 psi | 58% | 2700 fps | 97.4% |
| Bofors RP5 | <<locked>> | 80% | 46,398 psi | 73% | 2890 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 80% | 37,057 psi | 58% | 2700 fps | 98% |
| Hodgdon H4831 | <<locked>> | 80% | 48,008 psi | 75% | 2881 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,253 psi | 74% | 2867 fps | 98.9% |
| Hodgdon Retumbo | 86.2 gr | 80% | 38,421 psi | 60% | 2822 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,485 psi | 45% | 1736 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,776 psi | 76% | 2867 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 80% | 44,396 psi | 70% | 2871 fps | 98.9% |
| IMR 7977 Enduron | <<locked>> | 90% | 53,911 psi | 84% | 2927 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 84% | 33,272 psi | 52% | 2635 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 39,987 psi | 63% | 2680 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 29,167 psi | 46% | 2533 fps | 96.3% |
| Norma MRP | <<locked>> | 80% | 49,501 psi | 78% | 2966 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 44,817 psi | 70% | 2887 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 80% | 40,422 psi | 63% | 2756 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,312 psi | 46% | 1781 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,898 psi | 59% | 2799 fps | 99.8% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 37,478 psi | 59% | 2749 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 50,850 psi | 80% | 2910 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 49,922 psi | 78% | 2923 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 46,383 psi | 73% | 2881 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,574 psi | 78% | 2917 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 51,924 psi | 81% | 2900 fps | 99.5% |
| Somchem S385 | <<locked>> | 80% | 50,270 psi | 79% | 2894 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 43,990 psi | 69% | 2769 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 86% | 46,238 psi | 72% | 2838 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 49,966 psi | 78% | 2897 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,008 psi | 77% | 2963 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 80% | 40,973 psi | 64% | 2779 fps | 97.9% |
| Vihtavuori N568 | <<locked>> | 82% | 38,696 psi | 61% | 2769 fps | 95.9% |
| Vihtavuori N570 | 96.2 gr | 86% | 42,525 psi | 67% | 2890 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 44,222 psi | 69% | 2887 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,456 psi | 73% | 2825 fps | 99.7% |
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 54 powders for .30-378 Weath. Mag. loaded with the .308 | 190gr | TWENTY-NINE ERTP. ADI AR 2218 delivers the highest muzzle velocity at 3,186 fps; across all powders the maximum-charge window runs from 1,939 fps to 3,186 fps. Accurate 8700 gives the best case fill at 100 %, and 54 of the 54 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 190.0 gr projectile in 0.308" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Alliant Reloder-50, 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, ADI AR 2218, Vihtavuori N570 rank at the top here: for .30-378 Weath. Mag. with the .308 | 190gr | TWENTY-NINE ERTP 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.