Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 175gr | Atomic 29 HP bullet and 53 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Alliant Reloder-33 and Hodgdon Retumbo.
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% | 57,595 psi | 90% | 3097 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 55,854 psi | 88% | 3205 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 86% | 56,927 psi | 89% | 3215 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 84% | 55,187 psi | 86% | 3133 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 57,624 psi | 90% | 3212 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 96% | 56,565 psi | 89% | 3186 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,159 psi | 90% | 3314 fps | 98.8% |
| ADI AR 2225 | <<locked>> | 98% | 55,608 psi | 87% | 3205 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 55,332 psi | 87% | 3130 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 54,766 psi | 86% | 3120 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 54,201 psi | 85% | 3140 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,941 psi | 88% | 3100 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,478 psi | 89% | 3176 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,710 psi | 89% | 3192 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 54,752 psi | 86% | 3215 fps | 98.1% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 54,143 psi | 85% | 3192 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 54,520 psi | 85% | 3107 fps | 98.1% |
| Bofors RP15 | <<locked>> | 90% | 57,290 psi | 90% | 3192 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 56,217 psi | 88% | 3196 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 54,201 psi | 85% | 3140 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 54,041 psi | 85% | 3143 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 56,521 psi | 89% | 3140 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,492 psi | 87% | 3123 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,332 psi | 87% | 3035 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 55,912 psi | 88% | 3274 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,681 psi | 59% | 2028 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,290 psi | 90% | 3104 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,782 psi | 89% | 3117 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 88% | 56,072 psi | 88% | 3192 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,433 psi | 85% | 3182 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 55,695 psi | 87% | 3068 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 55,608 psi | 87% | 3202 fps | 100% |
| Norma MRP | <<locked>> | 84% | 54,230 psi | 85% | 3156 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 57,479 psi | 90% | 3219 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 55,738 psi | 87% | 3136 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,595 psi | 60% | 2073 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 56,855 psi | 89% | 3258 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 55,985 psi | 88% | 3222 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 84% | 55,666 psi | 87% | 3100 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 54,491 psi | 85% | 3110 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,114 psi | 85% | 3107 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 57,101 psi | 89% | 3091 fps | 99.6% |
| Somchem S365 | <<locked>> | 82% | 57,522 psi | 90% | 3097 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 54,679 psi | 86% | 3077 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 54,911 psi | 86% | 3064 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 53,911 psi | 84% | 3081 fps | 96.4% |
| Vihtavuori N555 | <<locked>> | 86% | 57,725 psi | 90% | 3130 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,609 psi | 90% | 3225 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 90% | 54,621 psi | 86% | 3150 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 94% | 56,362 psi | 88% | 3225 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 94% | 53,809 psi | 84% | 3222 fps | 97.5% |
| Winchester StaBALL HD | <<locked>> | 88% | 56,275 psi | 88% | 3192 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 54,636 psi | 86% | 3077 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% | 43,685 psi | 68% | 2858 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 48,298 psi | 76% | 3064 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 80% | 45,759 psi | 72% | 3002 fps | 97.6% |
| ADI AR 2209 | <<locked>> | 80% | 48,138 psi | 75% | 3009 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 43,410 psi | 68% | 2943 fps | 98.1% |
| ADI AR 2217 | <<locked>> | 82% | 34,360 psi | 54% | 2723 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 94% | 45,513 psi | 71% | 3071 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 29,370 psi | 46% | 2618 fps | 96.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 48,457 psi | 76% | 3005 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,008 psi | 75% | 2999 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,077 psi | 69% | 2949 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,786 psi | 67% | 2881 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,985 psi | 58% | 2812 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,660 psi | 76% | 3061 fps | 100% |
| Alliant Reloder-33 | 108.4 gr | 90% | 43,424 psi | 68% | 2989 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 96% | 46,383 psi | 73% | 3041 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,701 psi | 70% | 2917 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 40,872 psi | 64% | 2877 fps | 98.4% |
| Bofors RP30 | <<locked>> | 80% | 34,389 psi | 54% | 2736 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 44,077 psi | 69% | 2949 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 80% | 34,983 psi | 55% | 2743 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 80% | 45,847 psi | 72% | 2943 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,136 psi | 71% | 2927 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,880 psi | 81% | 2982 fps | 100% |
| Hodgdon Retumbo | 89.3 gr | 80% | 36,114 psi | 57% | 2858 fps | 98% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,224 psi | 44% | 1814 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,722 psi | 84% | 3048 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,789 psi | 73% | 2933 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 80% | 42,119 psi | 66% | 2927 fps | 97.8% |
| IMR 8133 Enduron | <<locked>> | 88% | 35,607 psi | 56% | 2785 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 37,521 psi | 59% | 2726 fps | 99.4% |
| Norma 217 | <<locked>> | 82% | 28,906 psi | 45% | 2612 fps | 95% |
| Norma MRP | <<locked>> | 80% | 46,833 psi | 73% | 3022 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 42,308 psi | 66% | 2936 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 80% | 37,927 psi | 59% | 2799 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,979 psi | 45% | 1857 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 35,346 psi | 55% | 2825 fps | 98.8% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 37,797 psi | 59% | 2848 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 48,747 psi | 76% | 2976 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 47,558 psi | 75% | 2986 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,210 psi | 74% | 2982 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 49,879 psi | 78% | 2966 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 53,737 psi | 84% | 3041 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,964 psi | 75% | 2959 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 41,858 psi | 66% | 2828 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 90% | 50,328 psi | 79% | 3015 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 47,181 psi | 74% | 2959 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,470 psi | 73% | 3018 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 80% | 38,435 psi | 60% | 2818 fps | 96.3% |
| Vihtavuori N568 | <<locked>> | 84% | 39,044 psi | 61% | 2871 fps | 95.1% |
| Vihtavuori N570 | 104.2 gr | 90% | 46,267 psi | 73% | 3071 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,336 psi | 65% | 2940 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,208 psi | 69% | 2884 fps | 99.1% |
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 53 powders for .30-378 Weath. Mag. loaded with the .308 | 175gr | Atomic 29 HP. ADI AR 2218 delivers the highest muzzle velocity at 3,314 fps; across all powders the maximum-charge window runs from 2,028 fps to 3,314 fps. ADI AR 2218 gives the best case fill at 100 %, and 53 of the 53 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 175.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, 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. Vihtavuori N570, Alliant Reloder-33, Hodgdon Retumbo rank at the top here: for .30-378 Weath. Mag. with the .308 | 175gr | Atomic 29 HP 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.