Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 201gr | RWS UNI Classic bullet and 42 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 Alliant Reloder-50.
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% | 54,418 psi | 85% | 2867 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 54,302 psi | 85% | 2982 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 82% | 57,363 psi | 90% | 3041 fps | 100% |
| ADI AR 2213 | <<locked>> | 82% | 54,041 psi | 85% | 2972 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 57,566 psi | 90% | 3022 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 54,172 psi | 85% | 3097 fps | 99.4% |
| ADI AR 2225 | <<locked>> | 94% | 57,595 psi | 90% | 3045 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 54,708 psi | 86% | 2966 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,840 psi | 89% | 2923 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 54,114 psi | 85% | 2949 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 56,304 psi | 88% | 3068 fps | 99.4% |
| Alliant Reloder-50 | <<locked>> | 96% | 56,739 psi | 89% | 3068 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,624 psi | 90% | 2992 fps | 99.5% |
| Bofors RP15 | <<locked>> | 84% | 54,288 psi | 85% | 2959 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 57,653 psi | 90% | 3035 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 54,708 psi | 86% | 2966 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 54,984 psi | 86% | 2979 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 56,260 psi | 88% | 2959 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 55,288 psi | 87% | 2946 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 53,795 psi | 84% | 3048 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,145 psi | 60% | 1913 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 56,260 psi | 88% | 2936 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 56,492 psi | 89% | 3018 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 55,013 psi | 86% | 2894 fps | 96.7% |
| IMR 8133 Enduron | <<locked>> | 96% | 56,449 psi | 88% | 3031 fps | 100% |
| Lovex D100 | <<locked>> | 92% | 56,130 psi | 88% | 2946 fps | 96% |
| Lovex S071 | <<locked>> | 88% | 56,521 psi | 89% | 2897 fps | 100% |
| Norma 217 | <<locked>> | 94% | 54,331 psi | 85% | 2995 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 54,114 psi | 85% | 2982 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 56,637 psi | 89% | 2969 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,175 psi | 61% | 1959 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 54,360 psi | 85% | 3028 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 57,566 psi | 90% | 3068 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 92% | 56,130 psi | 88% | 2946 fps | 96% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,927 psi | 88% | 2989 fps | 98.7% |
| Vihtavuori N165 | <<locked>> | 84% | 54,984 psi | 86% | 2890 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 54,375 psi | 85% | 2930 fps | 98% |
| Vihtavuori N565 | <<locked>> | 86% | 55,666 psi | 87% | 2989 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 53,911 psi | 84% | 3005 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 90% | 55,419 psi | 87% | 3074 fps | 99% |
| Winchester StaBALL HD | <<locked>> | 82% | 54,317 psi | 85% | 2963 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 54,563 psi | 86% | 2900 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% | 50,865 psi | 80% | 2812 fps | 100% |
| Accurate 8700 | <<locked>> | 92% | 40,495 psi | 63% | 2720 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 80% | 53,490 psi | 84% | 2979 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 50,401 psi | 79% | 2913 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 80% | 37,797 psi | 59% | 2657 fps | 98.5% |
| ADI AR 2218 | 103.3 gr | 86% | 40,321 psi | 63% | 2802 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 35,172 psi | 55% | 2635 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 51,140 psi | 80% | 2907 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,922 psi | 78% | 2822 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 44,005 psi | 69% | 2782 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 82% | 38,841 psi | 61% | 2723 fps | 95.2% |
| Alliant Reloder-50 | 107.3 gr | 88% | 42,221 psi | 66% | 2792 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,471 psi | 74% | 2815 fps | 98.1% |
| Bofors RP15 | <<locked>> | 80% | 47,572 psi | 75% | 2844 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 41,133 psi | 64% | 2740 fps | 99.1% |
| Bofors RP5 | <<locked>> | 80% | 51,140 psi | 80% | 2907 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 41,278 psi | 65% | 2736 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 80% | 52,591 psi | 82% | 2900 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,663 psi | 81% | 2884 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 80% | 43,294 psi | 68% | 2858 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,689 psi | 45% | 1713 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,750 psi | 83% | 2877 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 80% | 49,269 psi | 77% | 2897 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 84% | 48,327 psi | 76% | 2776 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 80% | 32,851 psi | 51% | 2556 fps | 96.6% |
| Lovex D100 | <<locked>> | 90% | 52,344 psi | 82% | 2884 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 43,947 psi | 69% | 2694 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,344 psi | 52% | 2579 fps | 98.7% |
| Ramshot Grand | <<locked>> | 80% | 50,183 psi | 79% | 2917 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 45,310 psi | 71% | 2785 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,544 psi | 46% | 1755 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 43,120 psi | 68% | 2838 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 39,624 psi | 62% | 2733 fps | 97.6% |
| Shooters World 50 BMG | <<locked>> | 90% | 52,344 psi | 82% | 2884 fps | 95.1% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 42,569 psi | 67% | 2743 fps | 95.6% |
| Vihtavuori N165 | <<locked>> | 80% | 48,254 psi | 76% | 2782 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 44,512 psi | 70% | 2746 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 80% | 45,498 psi | 71% | 2808 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 80% | 40,495 psi | 63% | 2743 fps | 97.4% |
| Vihtavuori N570 | 96.5 gr | 82% | 41,640 psi | 65% | 2802 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 50,502 psi | 79% | 2907 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,937 psi | 80% | 2841 fps | 100% |
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 42 powders for .30-378 Weath. Mag. loaded with the .308 | 201gr | RWS UNI Classic. ADI AR 2218 delivers the highest muzzle velocity at 3,097 fps; across all powders the maximum-charge window runs from 1,913 fps to 3,097 fps. Accurate 8700 gives the best case fill at 100 %, and 42 of the 42 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 201.0 gr projectile in 0.308" calls for a 1:12.5 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, Alliant Reloder-50 rank at the top here: for .30-378 Weath. Mag. with the .308 | 201gr | RWS UNI Classic 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.