Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 220gr | Rhino Solid Shank bullet and 42 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>> | 82% | 56,347 psi | 88% | 2772 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 56,826 psi | 89% | 2910 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 82% | 56,115 psi | 88% | 2884 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 56,028 psi | 88% | 2877 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 56,594 psi | 89% | 3022 fps | 99.9% |
| ADI AR 2225 | <<locked>> | 92% | 56,159 psi | 88% | 2904 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 56,710 psi | 89% | 2877 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,158 psi | 86% | 2776 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 56,318 psi | 88% | 2861 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 54,723 psi | 86% | 2930 fps | 99.6% |
| Alliant Reloder-50 | <<locked>> | 94% | 55,114 psi | 86% | 2930 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 55,869 psi | 88% | 2851 fps | 99.7% |
| Bofors RP15 | <<locked>> | 84% | 56,289 psi | 88% | 2871 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 56,188 psi | 88% | 2894 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 56,710 psi | 89% | 2877 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 57,305 psi | 90% | 2890 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 57,217 psi | 90% | 2854 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 56,405 psi | 88% | 2959 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,261 psi | 60% | 1827 fps | 100% |
| Hodgdon US 869 | <<locked>> | 98% | 57,261 psi | 90% | 2910 fps | 96.6% |
| IMR 7828 SSC | <<locked>> | 82% | 54,926 psi | 86% | 2871 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 56,637 psi | 89% | 2812 fps | 97.8% |
| IMR 8133 Enduron | <<locked>> | 94% | 55,114 psi | 86% | 2894 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 54,215 psi | 85% | 2808 fps | 96.4% |
| Lovex S071 | <<locked>> | 86% | 55,013 psi | 86% | 2756 fps | 100% |
| Norma 217 | <<locked>> | 94% | 56,869 psi | 89% | 2913 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 56,376 psi | 88% | 2894 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 56,086 psi | 88% | 2946 fps | 96.6% |
| Ramshot Magnum | <<locked>> | 84% | 54,795 psi | 86% | 2822 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,349 psi | 62% | 1867 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 56,855 psi | 89% | 2940 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 55,767 psi | 87% | 2923 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 54,215 psi | 85% | 2808 fps | 96.4% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 54,360 psi | 85% | 2851 fps | 99% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 51,648 psi | 81% | 2828 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 84% | 56,942 psi | 89% | 2799 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 56,318 psi | 88% | 2851 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 84% | 54,143 psi | 85% | 2844 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 56,246 psi | 88% | 2927 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 53,896 psi | 84% | 2933 fps | 99.3% |
| Winchester StaBALL HD | <<locked>> | 82% | 56,826 psi | 89% | 2871 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 56,347 psi | 88% | 2805 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 52,736 psi | 83% | 2723 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 39,407 psi | 62% | 2598 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 80% | 52,243 psi | 82% | 2825 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 39,450 psi | 62% | 2589 fps | 99.4% |
| ADI AR 2218 | <<locked>> | 82% | 36,361 psi | 57% | 2602 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 36,898 psi | 58% | 2569 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 52,953 psi | 83% | 2818 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 51,779 psi | 81% | 2726 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 45,919 psi | 72% | 2700 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 37,797 psi | 59% | 2598 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 84% | 38,334 psi | 60% | 2602 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,139 psi | 77% | 2736 fps | 99% |
| Bofors RP15 | <<locked>> | 80% | 49,371 psi | 77% | 2759 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 42,946 psi | 67% | 2664 fps | 99.7% |
| Bofors RP5 | <<locked>> | 80% | 52,953 psi | 83% | 2818 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,047 psi | 67% | 2657 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 53,374 psi | 84% | 2795 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 45,498 psi | 71% | 2782 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,776 psi | 45% | 1631 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 53,461 psi | 84% | 2848 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 80% | 51,271 psi | 80% | 2812 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 46,746 psi | 73% | 2641 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 80% | 34,432 psi | 54% | 2497 fps | 98% |
| Lovex D100 | <<locked>> | 88% | 50,633 psi | 79% | 2746 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 45,571 psi | 71% | 2608 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,186 psi | 55% | 2523 fps | 99.6% |
| Ramshot Grand | <<locked>> | 80% | 52,373 psi | 82% | 2835 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 52,301 psi | 82% | 2884 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 80% | 47,210 psi | 74% | 2703 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,675 psi | 47% | 1670 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 45,339 psi | 71% | 2759 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 41,481 psi | 65% | 2667 fps | 98.8% |
| Shooters World 50 BMG | <<locked>> | 88% | 50,633 psi | 79% | 2746 fps | 95.6% |
| SNPE Vectan SP 13 | <<locked>> | 88% | 38,740 psi | 61% | 2559 fps | 95.2% |
| Vihtavuori 20N29 | <<locked>> | 96% | 44,788 psi | 70% | 2703 fps | 95.5% |
| Vihtavuori N165 | <<locked>> | 80% | 50,024 psi | 78% | 2697 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,134 psi | 68% | 2612 fps | 96.1% |
| Vihtavuori N565 | <<locked>> | 80% | 47,369 psi | 74% | 2733 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 80% | 42,409 psi | 66% | 2680 fps | 98.6% |
| Vihtavuori N570 | <<locked>> | 80% | 40,567 psi | 64% | 2674 fps | 96.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 52,794 psi | 83% | 2815 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 52,721 psi | 83% | 2753 fps | 100% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 44 powders for .30-378 Weath. Mag. loaded with the .308 | 220gr | Rhino Solid Shank. ADI AR 2218 delivers the highest muzzle velocity at 3,022 fps; across all powders the maximum-charge window runs from 1,827 fps to 3,022 fps. Accurate 8700 gives the best case fill at 100 %, and 44 of the 44 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 220.0 gr projectile in 0.308" calls for a 1:12.0 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. As outliers, Hodgdon 50BMG 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.