Load Specifications
Load data in caliber .30-378 Weath. Mag. with .300 | 220gr | Berry's Spire Point bullet and 41 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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 82% | 57,276 psi | 90% | 2789 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 53,969 psi | 85% | 2867 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 82% | 57,072 psi | 89% | 2897 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 57,145 psi | 90% | 2894 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 53,824 psi | 84% | 2976 fps | 99.8% |
| ADI AR 2225 | <<locked>> | 92% | 57,232 psi | 90% | 2913 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 57,653 psi | 90% | 2890 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 56,144 psi | 88% | 2789 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 57,305 psi | 90% | 2874 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 55,999 psi | 88% | 2946 fps | 99.7% |
| Alliant Reloder-50 | <<locked>> | 94% | 56,376 psi | 88% | 2949 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 56,710 psi | 89% | 2864 fps | 99.8% |
| Bofors RP15 | <<locked>> | 84% | 57,217 psi | 90% | 2884 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 57,087 psi | 89% | 2907 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 57,653 psi | 90% | 2890 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 54,317 psi | 85% | 2848 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 57,464 psi | 90% | 2972 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,290 psi | 60% | 1831 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 54,491 psi | 85% | 2867 fps | 96.1% |
| IMR 7828 SSC | <<locked>> | 82% | 55,912 psi | 88% | 2887 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 57,508 psi | 90% | 2828 fps | 98% |
| IMR 8133 Enduron | <<locked>> | 94% | 56,173 psi | 88% | 2910 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 55,288 psi | 87% | 2828 fps | 96.8% |
| Lovex S071 | <<locked>> | 86% | 55,956 psi | 88% | 2769 fps | 100% |
| Norma 217 | <<locked>> | 92% | 54,230 psi | 85% | 2874 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 57,421 psi | 90% | 2907 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 57,261 psi | 90% | 2966 fps | 96.9% |
| Ramshot Magnum | <<locked>> | 84% | 55,854 psi | 88% | 2838 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,363 psi | 62% | 1873 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 53,954 psi | 85% | 2897 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 56,942 psi | 89% | 2940 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 55,288 psi | 87% | 2828 fps | 96.8% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 55,477 psi | 87% | 2871 fps | 99.2% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 52,707 psi | 83% | 2848 fps | 97.7% |
| Vihtavuori 24N41 | <<locked>> | 94% | 55,085 psi | 86% | 2874 fps | 96.2% |
| Vihtavuori N165 | <<locked>> | 82% | 54,244 psi | 85% | 2762 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 57,334 psi | 90% | 2867 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 84% | 55,013 psi | 86% | 2861 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 57,232 psi | 90% | 2943 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 55,100 psi | 86% | 2953 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 57,188 psi | 90% | 2818 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% | 53,490 psi | 84% | 2733 fps | 100% |
| Accurate 8700 | <<locked>> | 88% | 37,521 psi | 59% | 2556 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 80% | 53,214 psi | 83% | 2838 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 40,306 psi | 63% | 2608 fps | 99.5% |
| ADI AR 2218 | 97.2 gr | 82% | 37,173 psi | 58% | 2625 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 37,637 psi | 59% | 2585 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,911 psi | 84% | 2835 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 52,605 psi | 82% | 2740 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,891 psi | 73% | 2717 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 38,711 psi | 61% | 2618 fps | 96.3% |
| Alliant Reloder-50 | 101.1 gr | 84% | 39,218 psi | 61% | 2621 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,835 psi | 78% | 2749 fps | 99.1% |
| Bofors RP15 | <<locked>> | 80% | 50,299 psi | 79% | 2776 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,714 psi | 69% | 2680 fps | 99.8% |
| Bofors RP5 | <<locked>> | 80% | 53,911 psi | 84% | 2835 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,932 psi | 69% | 2677 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 46,441 psi | 73% | 2799 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,819 psi | 45% | 1637 fps | 100% |
| Hodgdon US 869 | <<locked>> | 94% | 50,763 psi | 80% | 2802 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 80% | 52,098 psi | 82% | 2828 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 80% | 44,541 psi | 70% | 2598 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 80% | 35,143 psi | 55% | 2513 fps | 98.3% |
| Lovex D100 | <<locked>> | 86% | 48,037 psi | 75% | 2703 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 46,383 psi | 73% | 2625 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,969 psi | 56% | 2539 fps | 99.7% |
| Ramshot Grand | <<locked>> | 80% | 53,403 psi | 84% | 2848 fps | 100% |
| Ramshot LRT | <<locked>> | 90% | 49,719 psi | 78% | 2838 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 80% | 48,254 psi | 76% | 2723 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,718 psi | 47% | 1677 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 46,325 psi | 73% | 2776 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 42,438 psi | 67% | 2684 fps | 99% |
| Shooters World 50 BMG | <<locked>> | 86% | 48,037 psi | 75% | 2703 fps | 95% |
| SNPE Vectan SP 13 | <<locked>> | 88% | 39,653 psi | 62% | 2579 fps | 95.7% |
| Vihtavuori 20N29 | <<locked>> | 96% | 45,818 psi | 72% | 2723 fps | 95.9% |
| Vihtavuori 24N41 | <<locked>> | 92% | 51,416 psi | 81% | 2815 fps | 95.3% |
| Vihtavuori N165 | <<locked>> | 80% | 50,720 psi | 79% | 2710 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,903 psi | 69% | 2628 fps | 96.4% |
| Vihtavuori N565 | <<locked>> | 80% | 48,225 psi | 76% | 2749 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 80% | 43,294 psi | 68% | 2697 fps | 98.8% |
| Vihtavuori N570 | 92.9 gr | 80% | 41,437 psi | 65% | 2694 fps | 96.7% |
| Winchester Supreme 780 | <<locked>> | 80% | 53,577 psi | 84% | 2766 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 41 powders for .30-378 Weath. Mag. loaded with the .300 | 220gr | Berry's Spire Point. ADI AR 2218 delivers the highest muzzle velocity at 2,976 fps; across all powders the maximum-charge window runs from 1,831 fps to 2,976 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 41 of the 41 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 1:13.0 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori 20N29 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 .300 | 220gr | Berry's Spire Point 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.