Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 201gr | RWS Kegelspitz 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 ReloadSwiss RS 80.
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% | 54,317 psi | 85% | 2864 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 54,273 psi | 85% | 2979 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 82% | 57,246 psi | 90% | 3035 fps | 100% |
| ADI AR 2213 | <<locked>> | 82% | 53,954 psi | 85% | 2969 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 57,508 psi | 90% | 3015 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 54,070 psi | 85% | 3091 fps | 99.4% |
| ADI AR 2225 | <<locked>> | 94% | 57,479 psi | 90% | 3041 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 54,607 psi | 86% | 2963 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,739 psi | 89% | 2920 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 57,696 psi | 90% | 3002 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 56,376 psi | 88% | 3068 fps | 99.4% |
| Alliant Reloder-50 | <<locked>> | 96% | 56,637 psi | 89% | 3064 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,696 psi | 90% | 2989 fps | 99.5% |
| Bofors RP15 | <<locked>> | 84% | 54,186 psi | 85% | 2956 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 57,566 psi | 90% | 3031 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 54,607 psi | 86% | 2963 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 54,868 psi | 86% | 2976 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 56,202 psi | 88% | 2956 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 55,187 psi | 86% | 2940 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 57,682 psi | 90% | 3100 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,189 psi | 60% | 1913 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 56,188 psi | 88% | 2930 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 56,594 psi | 89% | 3015 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,940 psi | 86% | 2890 fps | 96.7% |
| IMR 8133 Enduron | <<locked>> | 96% | 56,347 psi | 88% | 3031 fps | 100% |
| Lovex D100 | <<locked>> | 92% | 56,202 psi | 88% | 2943 fps | 96% |
| Lovex S071 | <<locked>> | 88% | 56,608 psi | 89% | 2897 fps | 100% |
| Norma 217 | <<locked>> | 94% | 54,215 psi | 85% | 2992 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 53,998 psi | 85% | 2979 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 56,550 psi | 89% | 2966 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,218 psi | 61% | 1955 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 54,273 psi | 85% | 3025 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 57,464 psi | 90% | 3064 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 92% | 56,202 psi | 88% | 2943 fps | 96% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,840 psi | 88% | 2982 fps | 98.7% |
| Vihtavuori N165 | <<locked>> | 84% | 55,056 psi | 86% | 2890 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 54,447 psi | 85% | 2930 fps | 98% |
| Vihtavuori N565 | <<locked>> | 86% | 55,550 psi | 87% | 2986 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 53,824 psi | 84% | 3002 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 90% | 55,376 psi | 87% | 3074 fps | 99% |
| Winchester StaBALL HD | <<locked>> | 82% | 54,215 psi | 85% | 2959 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 54,462 psi | 85% | 2894 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% | 50,763 psi | 80% | 2808 fps | 100% |
| Accurate 8700 | <<locked>> | 92% | 40,408 psi | 63% | 2717 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 80% | 53,388 psi | 84% | 2976 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 50,299 psi | 79% | 2907 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 80% | 37,840 psi | 59% | 2657 fps | 98.4% |
| ADI AR 2218 | 103.2 gr | 86% | 40,234 psi | 63% | 2795 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 35,114 psi | 55% | 2631 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 51,053 psi | 80% | 2904 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,835 psi | 78% | 2818 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 44,048 psi | 69% | 2782 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 82% | 38,798 psi | 61% | 2720 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 88% | 42,119 psi | 66% | 2785 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,384 psi | 74% | 2812 fps | 98% |
| Bofors RP15 | <<locked>> | 80% | 47,630 psi | 75% | 2844 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 41,031 psi | 64% | 2733 fps | 99.1% |
| Bofors RP5 | <<locked>> | 80% | 51,053 psi | 80% | 2904 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 41,191 psi | 65% | 2733 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 80% | 52,518 psi | 82% | 2897 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,590 psi | 81% | 2881 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 80% | 43,207 psi | 68% | 2854 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,718 psi | 45% | 1713 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,794 psi | 83% | 2874 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 80% | 49,153 psi | 77% | 2890 fps | 99.8% |
| IMR 7977 Enduron | <<locked>> | 84% | 48,254 psi | 76% | 2772 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 80% | 32,779 psi | 51% | 2549 fps | 96.5% |
| Lovex D100 | <<locked>> | 90% | 52,257 psi | 82% | 2877 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 43,888 psi | 69% | 2690 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,388 psi | 52% | 2579 fps | 98.7% |
| Ramshot Grand | <<locked>> | 80% | 50,227 psi | 79% | 2913 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 45,223 psi | 71% | 2779 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,573 psi | 46% | 1752 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 43,004 psi | 67% | 2831 fps | 100% |
| ReloadSwiss RS 80 | 97.8 gr | 80% | 39,581 psi | 62% | 2726 fps | 97.6% |
| Shooters World 50 BMG | <<locked>> | 90% | 52,257 psi | 82% | 2877 fps | 95% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 42,482 psi | 67% | 2736 fps | 95.5% |
| Vihtavuori N165 | <<locked>> | 80% | 48,182 psi | 76% | 2779 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 44,469 psi | 70% | 2743 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 80% | 45,440 psi | 71% | 2805 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 80% | 40,567 psi | 64% | 2743 fps | 97.4% |
| Vihtavuori N570 | 96.4 gr | 82% | 41,553 psi | 65% | 2799 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 50,386 psi | 79% | 2904 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,879 psi | 80% | 2838 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 Kegelspitz. Hodgdon Retumbo delivers the highest muzzle velocity at 3,100 fps; across all powders the maximum-charge window runs from 1,913 fps to 3,100 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 1:14.0 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, ReloadSwiss RS 80 rank at the top here: for .30-378 Weath. Mag. with the .308 | 201gr | RWS Kegelspitz 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.