Load Specifications
Load data in caliber .30-378 Weath. Mag. with .311 | 190gr | Winchester Silvertip bullet and 40 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-33.
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.
A valid access license is required to use the Personalized Load Calculator.
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% | 54,244 psi | 85% | 2936 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 54,389 psi | 85% | 3045 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 82% | 57,334 psi | 90% | 3110 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 84% | 57,740 psi | 90% | 3104 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 57,508 psi | 90% | 3091 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 54,157 psi | 85% | 3159 fps | 99.1% |
| ADI AR 2225 | <<locked>> | 94% | 57,638 psi | 90% | 3114 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 54,462 psi | 85% | 3035 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,652 psi | 89% | 2992 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 53,882 psi | 84% | 3018 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 56,333 psi | 88% | 3136 fps | 99.1% |
| Alliant Reloder-50 | <<locked>> | 96% | 56,855 psi | 89% | 3133 fps | 98.8% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,711 psi | 90% | 3064 fps | 99.4% |
| Bofors RP15 | <<locked>> | 84% | 54,230 psi | 85% | 3031 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 57,653 psi | 90% | 3107 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 54,462 psi | 85% | 3035 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 54,868 psi | 86% | 3048 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 56,173 psi | 88% | 3031 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 82% | 55,071 psi | 86% | 3012 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 88% | 57,682 psi | 90% | 3179 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,189 psi | 60% | 1975 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 56,130 psi | 88% | 3002 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 84% | 56,507 psi | 89% | 3087 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,853 psi | 86% | 2959 fps | 96.3% |
| IMR 8133 Enduron | <<locked>> | 96% | 56,507 psi | 89% | 3104 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 56,463 psi | 88% | 2969 fps | 100% |
| Norma 217 | <<locked>> | 94% | 54,317 psi | 85% | 3064 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 53,911 psi | 84% | 3048 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 56,565 psi | 89% | 3035 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,175 psi | 61% | 2021 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 54,346 psi | 85% | 3097 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 57,551 psi | 90% | 3136 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,970 psi | 88% | 3051 fps | 98.4% |
| Vihtavuori N165 | <<locked>> | 84% | 54,868 psi | 86% | 2959 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 54,389 psi | 85% | 2995 fps | 97.6% |
| Vihtavuori N565 | <<locked>> | 86% | 55,579 psi | 87% | 3058 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 53,911 psi | 84% | 3071 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 90% | 55,492 psi | 87% | 3143 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 82% | 54,157 psi | 85% | 3031 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 54,433 psi | 85% | 2966 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% | 50,807 psi | 80% | 2881 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 43,468 psi | 68% | 2841 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 80% | 53,432 psi | 84% | 3045 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 50,270 psi | 79% | 2979 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 80% | 37,710 psi | 59% | 2717 fps | 98% |
| ADI AR 2218 | 107.3 gr | 86% | 40,335 psi | 63% | 2854 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 80% | 35,128 psi | 55% | 2690 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 51,053 psi | 80% | 2976 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,690 psi | 78% | 2887 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,976 psi | 69% | 2848 fps | 100% |
| Alliant Reloder-33 | 106.7 gr | 84% | 41,887 psi | 66% | 2851 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 88% | 42,206 psi | 66% | 2848 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,485 psi | 74% | 2881 fps | 97.7% |
| Bofors RP15 | <<locked>> | 80% | 47,442 psi | 74% | 2910 fps | 99.9% |
| Bofors RP30 | <<locked>> | 80% | 41,060 psi | 64% | 2799 fps | 98.8% |
| Bofors RP5 | <<locked>> | 80% | 51,053 psi | 80% | 2976 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 41,191 psi | 65% | 2795 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 80% | 52,460 psi | 82% | 2966 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,576 psi | 81% | 2953 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 80% | 43,221 psi | 68% | 2923 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,703 psi | 45% | 1768 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,721 psi | 83% | 2946 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 80% | 49,168 psi | 77% | 2963 fps | 99.7% |
| IMR 7977 Enduron | <<locked>> | 86% | 51,474 psi | 81% | 2900 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 80% | 32,648 psi | 51% | 2602 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 43,859 psi | 69% | 2759 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,228 psi | 52% | 2631 fps | 98.2% |
| Ramshot Grand | <<locked>> | 80% | 50,111 psi | 79% | 2982 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 45,295 psi | 71% | 2848 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,530 psi | 46% | 1811 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 43,004 psi | 67% | 2897 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 39,508 psi | 62% | 2785 fps | 97.1% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 42,612 psi | 67% | 2799 fps | 95% |
| Vihtavuori N165 | <<locked>> | 80% | 48,211 psi | 76% | 2851 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 44,469 psi | 70% | 2805 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 80% | 45,368 psi | 71% | 2867 fps | 99.1% |
| Vihtavuori N568 | <<locked>> | 80% | 40,393 psi | 63% | 2802 fps | 96.8% |
| Vihtavuori N570 | 100.2 gr | 82% | 41,539 psi | 65% | 2858 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 50,270 psi | 79% | 2972 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,821 psi | 80% | 2907 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 40 powders for .30-378 Weath. Mag. loaded with the .311 | 190gr | Winchester Silvertip. Hodgdon Retumbo delivers the highest muzzle velocity at 3,179 fps; across all powders the maximum-charge window runs from 1,975 fps to 3,179 fps. Accurate 8700 gives the best case fill at 100 %, and 40 of the 40 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 190.0 gr projectile in 0.311" calls for a 1:6.0 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, Alliant Reloder-33 rank at the top here: for .30-378 Weath. Mag. with the .311 | 190gr | Winchester Silvertip 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.