Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 182gr | CutEdge MTAC bullet and 51 powders. The key underlying parameters are shown in the table above.
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% | 54,998 psi | 86% | 3009 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 57,159 psi | 90% | 3176 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 54,186 psi | 85% | 3120 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 84% | 56,449 psi | 88% | 3104 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,013 psi | 86% | 3117 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 54,070 psi | 85% | 3097 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 54,491 psi | 85% | 3222 fps | 98.7% |
| ADI AR 2225 | <<locked>> | 98% | 57,145 psi | 90% | 3179 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,014 psi | 88% | 3094 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,405 psi | 87% | 3114 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,363 psi | 90% | 3071 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 54,230 psi | 85% | 3094 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,128 psi | 85% | 3100 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,304 psi | 88% | 3196 fps | 98.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,825 psi | 87% | 3179 fps | 98.2% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,651 psi | 87% | 3081 fps | 98.6% |
| Bofors RP15 | <<locked>> | 88% | 54,795 psi | 86% | 3100 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 57,711 psi | 90% | 3169 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 55,405 psi | 87% | 3114 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 55,506 psi | 87% | 3120 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 57,682 psi | 90% | 3107 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,652 psi | 89% | 3091 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,550 psi | 89% | 2999 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,363 psi | 90% | 3245 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,782 psi | 59% | 1991 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 54,346 psi | 85% | 3028 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 88% | 57,392 psi | 90% | 3166 fps | 100% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,825 psi | 87% | 3156 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 56,898 psi | 89% | 3035 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,130 psi | 90% | 3176 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,535 psi | 87% | 3127 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,723 psi | 86% | 3123 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 57,276 psi | 90% | 3110 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,725 psi | 61% | 2034 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 54,041 psi | 85% | 3166 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,580 psi | 90% | 3199 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 84% | 56,855 psi | 89% | 3071 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 84% | 55,767 psi | 87% | 3084 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 48,298 psi | 76% | 2969 fps | 96% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,390 psi | 87% | 3077 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,476 psi | 85% | 3002 fps | 99.6% |
| Somchem S385 | <<locked>> | 84% | 55,956 psi | 88% | 3048 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,101 psi | 88% | 3038 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 55,201 psi | 87% | 3058 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 84% | 55,317 psi | 87% | 3045 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,955 psi | 86% | 3130 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 90% | 55,985 psi | 88% | 3123 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 92% | 53,954 psi | 85% | 3136 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 94% | 55,259 psi | 87% | 3202 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 86% | 53,925 psi | 85% | 3104 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,782 psi | 87% | 3045 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 44,788 psi | 70% | 2835 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 49,574 psi | 78% | 3045 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 80% | 46,876 psi | 73% | 2979 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 80% | 49,255 psi | 77% | 2982 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 44,411 psi | 70% | 2923 fps | 98.6% |
| ADI AR 2217 | <<locked>> | 80% | 32,851 psi | 51% | 2641 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 92% | 43,381 psi | 68% | 2982 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 30,110 psi | 47% | 2605 fps | 97.2% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,066 psi | 77% | 2972 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,063 psi | 71% | 2923 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,758 psi | 69% | 2848 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,029 psi | 60% | 2792 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,125 psi | 79% | 3035 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 44,643 psi | 70% | 2972 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 94% | 44,411 psi | 70% | 2956 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 42,670 psi | 67% | 2828 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 41,887 psi | 66% | 2854 fps | 98.9% |
| Bofors RP30 | <<locked>> | 80% | 35,389 psi | 55% | 2720 fps | 96.5% |
| Bofors RP5 | <<locked>> | 80% | 45,063 psi | 71% | 2923 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 80% | 35,810 psi | 56% | 2723 fps | 97.2% |
| Hodgdon H4831 | <<locked>> | 80% | 46,920 psi | 74% | 2920 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,050 psi | 72% | 2904 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,011 psi | 83% | 2949 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 37,072 psi | 58% | 2841 fps | 98.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,268 psi | 44% | 1781 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,761 psi | 75% | 2907 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 80% | 43,120 psi | 68% | 2900 fps | 98.4% |
| IMR 8133 Enduron | <<locked>> | 86% | 34,214 psi | 54% | 2707 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 38,450 psi | 60% | 2703 fps | 99.7% |
| Norma 217 | <<locked>> | 82% | 29,892 psi | 47% | 2602 fps | 96.2% |
| Norma MRP | <<locked>> | 80% | 48,080 psi | 75% | 2995 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 43,453 psi | 68% | 2917 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 80% | 39,088 psi | 61% | 2782 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,037 psi | 46% | 1824 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,506 psi | 57% | 2815 fps | 99.3% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 36,013 psi | 56% | 2759 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 49,777 psi | 78% | 2949 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 80% | 48,646 psi | 76% | 2959 fps | 99.8% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 45,078 psi | 71% | 2907 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,341 psi | 76% | 2956 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 50,836 psi | 80% | 2940 fps | 99.2% |
| Somchem S385 | <<locked>> | 80% | 48,907 psi | 77% | 2930 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 42,873 psi | 67% | 2805 fps | 99.4% |
| Vihtavuori N170 | <<locked>> | 88% | 48,095 psi | 75% | 2930 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 48,312 psi | 76% | 2930 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,688 psi | 75% | 2999 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 80% | 39,508 psi | 62% | 2799 fps | 97.1% |
| Vihtavuori N568 | <<locked>> | 84% | 40,176 psi | 63% | 2854 fps | 96% |
| Vihtavuori N570 | <<locked>> | 88% | 44,280 psi | 69% | 2982 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,627 psi | 67% | 2917 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,281 psi | 71% | 2861 fps | 99.5% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 59 powders for .30-378 Weath. Mag. loaded with the .308 | 182gr | CutEdge MTAC. Hodgdon Retumbo delivers the highest muzzle velocity at 3,245 fps; across all powders the maximum-charge window runs from 1,991 fps to 3,245 fps. Accurate 8700 gives the best case fill at 100 %, and 59 of the 59 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 182.0 gr projectile in 0.308" calls for a 1:11.0 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. As outliers, Hodgdon US 869, Lovex D100, Ramshot LRT burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.