Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 181gr | RWS H-Mantel bullet and 52 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Vihtavuori N570 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>> | 84% | 54,172 psi | 85% | 2995 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,443 psi | 77% | 3018 fps | 96.9% |
| Accurate High Country | <<locked>> | 82% | 56,057 psi | 88% | 3159 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 84% | 57,000 psi | 89% | 3169 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 55,100 psi | 86% | 3087 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 57,725 psi | 90% | 3166 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 56,927 psi | 89% | 3146 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 57,740 psi | 90% | 3281 fps | 99.2% |
| ADI AR 2225 | <<locked>> | 96% | 56,391 psi | 88% | 3166 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 55,303 psi | 87% | 3084 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,752 psi | 86% | 3074 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,462 psi | 85% | 3097 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,420 psi | 88% | 3054 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,130 psi | 90% | 3136 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 57,130 psi | 90% | 3146 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,521 psi | 87% | 3182 fps | 98.6% |
| Alliant Reloder-50 | <<locked>> | 98% | 55,622 psi | 87% | 3176 fps | 98.2% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,172 psi | 85% | 3061 fps | 98.5% |
| Bofors RP15 | <<locked>> | 88% | 57,580 psi | 90% | 3150 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 56,956 psi | 89% | 3159 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,462 psi | 85% | 3097 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,346 psi | 85% | 3100 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,347 psi | 88% | 3094 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,347 psi | 87% | 3077 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 90% | 56,666 psi | 89% | 3232 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,927 psi | 59% | 2005 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,420 psi | 88% | 3068 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 86% | 56,173 psi | 88% | 3146 fps | 99.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,448 psi | 87% | 3150 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 56,246 psi | 88% | 3028 fps | 100% |
| Norma 217 | <<locked>> | 98% | 56,840 psi | 89% | 3173 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,462 psi | 85% | 3110 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 57,740 psi | 90% | 3176 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 56,159 psi | 88% | 3097 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,899 psi | 61% | 2051 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 57,609 psi | 90% | 3219 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 56,652 psi | 89% | 3186 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 55,448 psi | 87% | 3054 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 54,607 psi | 86% | 3068 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,372 psi | 81% | 3028 fps | 96.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,244 psi | 85% | 3064 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,666 psi | 89% | 3041 fps | 99.8% |
| Somchem S385 | <<locked>> | 82% | 54,868 psi | 86% | 3035 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,940 psi | 86% | 3022 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,317 psi | 85% | 3048 fps | 97% |
| Vihtavuori N555 | <<locked>> | 82% | 54,418 psi | 85% | 3031 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 57,725 psi | 90% | 3179 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 55,230 psi | 87% | 3114 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 92% | 57,087 psi | 89% | 3189 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 92% | 54,491 psi | 85% | 3189 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 86% | 57,406 psi | 90% | 3153 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,563 psi | 86% | 3028 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% | 47,398 psi | 74% | 2884 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 45,832 psi | 72% | 2946 fps | 95.8% |
| Accurate High Country | <<locked>> | 80% | 52,214 psi | 82% | 3094 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 80% | 49,545 psi | 78% | 3035 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 80% | 51,459 psi | 81% | 3022 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 46,804 psi | 73% | 2972 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 80% | 34,896 psi | 55% | 2697 fps | 96.3% |
| ADI AR 2218 | 108.7 gr | 90% | 42,859 psi | 67% | 2972 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 32,256 psi | 51% | 2667 fps | 98.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 51,735 psi | 81% | 3018 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,242 psi | 80% | 3012 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,572 psi | 75% | 2972 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,238 psi | 72% | 2894 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,451 psi | 63% | 2844 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 53,142 psi | 83% | 3084 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 44,280 psi | 69% | 2966 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 92% | 44,396 psi | 70% | 2956 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,469 psi | 70% | 2871 fps | 96.3% |
| Bofors RP15 | <<locked>> | 80% | 44,237 psi | 69% | 2904 fps | 99.3% |
| Bofors RP30 | <<locked>> | 80% | 37,782 psi | 59% | 2779 fps | 97.4% |
| Bofors RP5 | <<locked>> | 80% | 47,572 psi | 75% | 2972 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 80% | 38,043 psi | 60% | 2779 fps | 98% |
| Hodgdon H4831 | <<locked>> | 80% | 49,182 psi | 77% | 2966 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,312 psi | 76% | 2949 fps | 98.9% |
| Hodgdon Retumbo | 91.2 gr | 80% | 39,552 psi | 62% | 2904 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,543 psi | 45% | 1798 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,690 psi | 78% | 2946 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 80% | 45,556 psi | 71% | 2953 fps | 98.9% |
| IMR 8133 Enduron | <<locked>> | 84% | 34,360 psi | 54% | 2710 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 40,915 psi | 64% | 2759 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 30,124 psi | 47% | 2605 fps | 96.3% |
| Norma MRP | <<locked>> | 80% | 50,720 psi | 79% | 3048 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,224 psi | 72% | 2972 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 80% | 41,597 psi | 65% | 2835 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,356 psi | 46% | 1841 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,073 psi | 61% | 2877 fps | 99.8% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 35,998 psi | 56% | 2756 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 51,909 psi | 81% | 2992 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 51,010 psi | 80% | 3005 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 44,759 psi | 70% | 2897 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,662 psi | 79% | 3002 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 53,055 psi | 83% | 2982 fps | 99.5% |
| Somchem S385 | <<locked>> | 80% | 51,387 psi | 81% | 2976 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,078 psi | 71% | 2848 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 86% | 47,369 psi | 74% | 2917 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 80% | 51,010 psi | 80% | 2976 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,169 psi | 79% | 3045 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 80% | 42,061 psi | 66% | 2858 fps | 97.9% |
| Vihtavuori N568 | <<locked>> | 82% | 39,871 psi | 62% | 2848 fps | 96% |
| Vihtavuori N570 | 101.7 gr | 86% | 43,845 psi | 69% | 2972 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,832 psi | 72% | 2972 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,572 psi | 75% | 2907 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 52 powders for .30-378 Weath. Mag. loaded with the .308 | 181gr | RWS H-Mantel. ADI AR 2218 delivers the highest muzzle velocity at 3,281 fps; across all powders the maximum-charge window runs from 2,005 fps to 3,281 fps. Accurate 8700 gives the best case fill at 100 %, and 52 of the 52 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 181.0 gr projectile in 0.308" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, ReloadSwiss RS 14 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. ADI AR 2218, Vihtavuori N570, Hodgdon Retumbo rank at the top here: for .30-378 Weath. Mag. with the .308 | 181gr | RWS H-Mantel 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.