Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 200gr | MAKER 200 Grain .308 Expanding Subsonic Blackout Bullets bullet and 53 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Hodgdon Retumbo and ReloadSwiss RS 76.
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>> | 84% | 54,984 psi | 86% | 2884 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 50,749 psi | 80% | 2930 fps | 98% |
| Accurate High Country | <<locked>> | 82% | 57,261 psi | 90% | 3051 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 54,346 psi | 85% | 2999 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 82% | 56,231 psi | 88% | 2972 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 55,085 psi | 86% | 2995 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 54,534 psi | 85% | 2982 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 54,926 psi | 86% | 3114 fps | 99.4% |
| ADI AR 2225 | <<locked>> | 94% | 53,969 psi | 85% | 3002 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 56,405 psi | 88% | 2972 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,840 psi | 88% | 2963 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 55,550 psi | 87% | 2989 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 57,508 psi | 90% | 2940 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 54,563 psi | 86% | 2969 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 56,797 psi | 89% | 3084 fps | 99.3% |
| Alliant Reloder-50 | <<locked>> | 98% | 56,782 psi | 89% | 3077 fps | 99% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 55,274 psi | 87% | 2959 fps | 99.2% |
| Bofors RP15 | <<locked>> | 86% | 54,955 psi | 86% | 2979 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 54,404 psi | 85% | 2992 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 55,550 psi | 87% | 2989 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 55,767 psi | 87% | 2999 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 57,508 psi | 90% | 2986 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 84% | 56,449 psi | 88% | 2966 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 54,302 psi | 85% | 3064 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,971 psi | 60% | 1906 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 57,522 psi | 90% | 2959 fps | 100% |
| IMR 7828 SSC | <<locked>> | 86% | 57,595 psi | 90% | 3041 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 56,144 psi | 88% | 2917 fps | 96.7% |
| IMR 8133 Enduron | <<locked>> | 98% | 56,608 psi | 89% | 3045 fps | 100% |
| Lovex D100 | <<locked>> | 94% | 57,101 psi | 89% | 2966 fps | 96% |
| Lovex S071 | <<locked>> | 90% | 57,072 psi | 89% | 2913 fps | 100% |
| Norma 217 | <<locked>> | 96% | 54,404 psi | 85% | 3009 fps | 100% |
| Norma MRP | <<locked>> | 82% | 55,651 psi | 87% | 2999 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 54,998 psi | 86% | 3002 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 57,363 psi | 90% | 2986 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,972 psi | 61% | 1952 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 54,781 psi | 86% | 3045 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 53,882 psi | 84% | 3015 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 56,420 psi | 88% | 2943 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 55,637 psi | 87% | 2956 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 94% | 57,101 psi | 89% | 2966 fps | 96% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 52,547 psi | 82% | 2936 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 55,274 psi | 87% | 2953 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 55,651 psi | 87% | 2920 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,999 psi | 88% | 2913 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 55,230 psi | 87% | 2949 fps | 98% |
| Vihtavuori N555 | <<locked>> | 82% | 55,376 psi | 87% | 2913 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 54,998 psi | 86% | 3009 fps | 100% |
| Vihtavuori N565 | <<locked>> | 88% | 56,231 psi | 88% | 3005 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 54,360 psi | 85% | 3022 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 92% | 55,970 psi | 88% | 3091 fps | 99% |
| Winchester StaBALL HD | <<locked>> | 84% | 54,723 psi | 86% | 2979 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 55,637 psi | 87% | 2920 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% | 48,008 psi | 75% | 2772 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 40,451 psi | 63% | 2726 fps | 95.1% |
| Accurate High Country | <<locked>> | 80% | 53,359 psi | 84% | 2989 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 50,517 psi | 79% | 2933 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 80% | 52,547 psi | 82% | 2917 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 47,761 psi | 75% | 2867 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 80% | 35,505 psi | 56% | 2612 fps | 97.6% |
| ADI AR 2218 | 103.2 gr | 88% | 40,611 psi | 64% | 2815 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 32,706 psi | 51% | 2579 fps | 99.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 52,794 psi | 83% | 2913 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,272 psi | 82% | 2907 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 48,385 psi | 76% | 2867 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 47,065 psi | 74% | 2782 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 41,336 psi | 65% | 2743 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 84% | 38,841 psi | 61% | 2730 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 90% | 41,800 psi | 66% | 2792 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,426 psi | 71% | 2779 fps | 97.4% |
| Bofors RP15 | <<locked>> | 80% | 45,034 psi | 71% | 2805 fps | 99.8% |
| Bofors RP30 | <<locked>> | 80% | 38,464 psi | 60% | 2687 fps | 98.4% |
| Bofors RP5 | <<locked>> | 80% | 48,385 psi | 76% | 2867 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 38,711 psi | 61% | 2687 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 80% | 50,096 psi | 79% | 2864 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,168 psi | 77% | 2844 fps | 99.5% |
| Hodgdon Retumbo | 88.5 gr | 80% | 40,408 psi | 63% | 2805 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,529 psi | 45% | 1706 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,604 psi | 79% | 2844 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 80% | 46,514 psi | 73% | 2854 fps | 99.6% |
| IMR 7977 Enduron | <<locked>> | 86% | 49,211 psi | 77% | 2795 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 80% | 30,168 psi | 47% | 2490 fps | 95% |
| Lovex D100 | <<locked>> | 92% | 53,214 psi | 83% | 2900 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 41,292 psi | 65% | 2651 fps | 100% |
| Norma 217 | <<locked>> | 80% | 30,603 psi | 48% | 2516 fps | 97.6% |
| Norma MRP | <<locked>> | 80% | 51,808 psi | 81% | 2940 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 47,239 psi | 74% | 2871 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 80% | 42,409 psi | 66% | 2736 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,225 psi | 46% | 1745 fps | 100% |
| ReloadSwiss RS 76 | 94.8 gr | 80% | 40,045 psi | 63% | 2785 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 36,593 psi | 57% | 2667 fps | 96.4% |
| Rottweil R 904 | <<locked>> | 80% | 52,823 psi | 83% | 2884 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 80% | 52,011 psi | 82% | 2897 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 92% | 53,214 psi | 83% | 2900 fps | 95% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 42,511 psi | 67% | 2746 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 51,663 psi | 81% | 2894 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 52,127 psi | 82% | 2864 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,861 psi | 72% | 2746 fps | 100% |
| Vihtavuori N170 | <<locked>> | 84% | 44,933 psi | 70% | 2759 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 51,793 psi | 81% | 2861 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 51,256 psi | 80% | 2943 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 80% | 42,699 psi | 67% | 2759 fps | 98.8% |
| Vihtavuori N568 | <<locked>> | 80% | 37,782 psi | 59% | 2690 fps | 96.3% |
| Vihtavuori N570 | <<locked>> | 84% | 41,727 psi | 65% | 2812 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,920 psi | 74% | 2861 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 48,428 psi | 76% | 2805 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 53 powders for .30-378 Weath. Mag. loaded with the .308 | 200gr | MAKER 200 Grain .308 Expanding Subsonic Blackout Bullets. ADI AR 2218 delivers the highest muzzle velocity at 3,114 fps; across all powders the maximum-charge window runs from 1,906 fps to 3,114 fps. Accurate 8700 gives the best case fill at 100 %, and 53 of the 53 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 200.0 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. ADI AR 2218, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .30-378 Weath. Mag. with the .308 | 200gr | MAKER 200 Grain .308 Expanding Subsonic Blackout Bullets 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.