Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Hornady InterLock RN bullet and 52 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.
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Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 84% | 55,245 psi | 87% | 3022 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 51,010 psi | 80% | 3048 fps | 97.3% |
| Accurate High Country | <<locked>> | 82% | 57,392 psi | 90% | 3189 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 54,360 psi | 85% | 3130 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 82% | 56,072 psi | 88% | 3110 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 54,955 psi | 86% | 3130 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 54,476 psi | 85% | 3114 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 54,897 psi | 86% | 3238 fps | 98.8% |
| ADI AR 2225 | <<locked>> | 94% | 53,998 psi | 85% | 3136 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 56,246 psi | 88% | 3107 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,695 psi | 87% | 3097 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 55,535 psi | 87% | 3123 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 57,595 psi | 90% | 3081 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 54,592 psi | 86% | 3104 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 57,087 psi | 89% | 3215 fps | 98.8% |
| Alliant Reloder-50 | <<locked>> | 98% | 57,363 psi | 90% | 3209 fps | 98.5% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 55,216 psi | 87% | 3087 fps | 98.7% |
| Bofors RP15 | <<locked>> | 86% | 55,085 psi | 86% | 3114 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 54,534 psi | 85% | 3127 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 55,535 psi | 87% | 3123 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 55,709 psi | 87% | 3130 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 57,348 psi | 90% | 3117 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 56,391 psi | 88% | 3100 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 54,085 psi | 85% | 3199 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,000 psi | 60% | 2021 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 57,392 psi | 90% | 3091 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 86% | 57,464 psi | 90% | 3176 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 56,173 psi | 88% | 3041 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 56,855 psi | 89% | 3179 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 57,334 psi | 90% | 3051 fps | 100% |
| Norma 217 | <<locked>> | 96% | 54,621 psi | 86% | 3143 fps | 100% |
| Norma MRP | <<locked>> | 82% | 55,782 psi | 87% | 3136 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 54,853 psi | 86% | 3133 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 57,464 psi | 90% | 3120 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,957 psi | 61% | 2064 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 54,984 psi | 86% | 3179 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 54,172 psi | 85% | 3150 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 82% | 56,391 psi | 88% | 3077 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 55,608 psi | 87% | 3091 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 52,794 psi | 83% | 3058 fps | 97.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 55,245 psi | 87% | 3087 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 57,682 psi | 90% | 3064 fps | 99.8% |
| Somchem S385 | <<locked>> | 82% | 55,941 psi | 88% | 3058 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 56,072 psi | 88% | 3048 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 55,390 psi | 87% | 3074 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 82% | 55,651 psi | 87% | 3058 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 55,071 psi | 86% | 3143 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 56,536 psi | 89% | 3140 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 54,549 psi | 85% | 3153 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 92% | 56,086 psi | 88% | 3222 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 84% | 54,708 psi | 86% | 3120 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 55,709 psi | 87% | 3054 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% | 48,356 psi | 76% | 2907 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 43,888 psi | 69% | 2910 fps | 95.2% |
| Accurate High Country | <<locked>> | 80% | 53,374 psi | 84% | 3120 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 80% | 50,749 psi | 80% | 3064 fps | 99% |
| ADI AR 2209 | <<locked>> | 80% | 52,460 psi | 82% | 3048 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 47,747 psi | 75% | 2995 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 80% | 35,708 psi | 56% | 2723 fps | 96.7% |
| ADI AR 2218 | 111.2 gr | 90% | 43,932 psi | 69% | 3002 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 33,054 psi | 52% | 2694 fps | 98.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 52,692 psi | 83% | 3048 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,199 psi | 82% | 3038 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 48,515 psi | 76% | 2995 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 47,297 psi | 74% | 2917 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 41,452 psi | 65% | 2867 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 42,250 psi | 66% | 2923 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 92% | 45,774 psi | 72% | 2986 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,426 psi | 71% | 2900 fps | 96.6% |
| Bofors RP15 | <<locked>> | 80% | 45,208 psi | 71% | 2933 fps | 99.4% |
| Bofors RP30 | <<locked>> | 80% | 38,696 psi | 61% | 2805 fps | 97.7% |
| Bofors RP5 | <<locked>> | 80% | 48,515 psi | 76% | 2995 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 38,885 psi | 61% | 2805 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 80% | 50,096 psi | 79% | 2989 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,226 psi | 77% | 2972 fps | 99% |
| Hodgdon Retumbo | 93.3 gr | 80% | 40,538 psi | 64% | 2930 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,572 psi | 45% | 1811 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,546 psi | 79% | 2972 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 80% | 46,586 psi | 73% | 2979 fps | 99.1% |
| IMR 7977 Enduron | <<locked>> | 88% | 52,663 psi | 83% | 2979 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 82% | 32,895 psi | 52% | 2671 fps | 95.2% |
| Lovex S071 | <<locked>> | 80% | 41,771 psi | 65% | 2782 fps | 100% |
| Norma 217 | <<locked>> | 80% | 31,024 psi | 49% | 2635 fps | 96.7% |
| Norma MRP | <<locked>> | 80% | 51,866 psi | 81% | 3071 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 47,253 psi | 74% | 2999 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 80% | 42,743 psi | 67% | 2864 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,370 psi | 46% | 1854 fps | 100% |
| ReloadSwiss RS 76 | 99.9 gr | 80% | 40,248 psi | 63% | 2907 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 37,028 psi | 58% | 2785 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 52,837 psi | 83% | 3018 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 52,025 psi | 82% | 3028 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 46,006 psi | 72% | 2930 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 51,677 psi | 81% | 3028 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 54,070 psi | 85% | 3009 fps | 99.6% |
| Somchem S385 | <<locked>> | 80% | 52,301 psi | 82% | 2999 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,963 psi | 72% | 2874 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 48,414 psi | 76% | 2946 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 52,112 psi | 82% | 2999 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 51,256 psi | 80% | 3074 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 80% | 42,946 psi | 67% | 2884 fps | 98.1% |
| Vihtavuori N568 | <<locked>> | 80% | 38,000 psi | 60% | 2805 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 86% | 45,136 psi | 71% | 3005 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 47,021 psi | 74% | 2995 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 48,457 psi | 76% | 2930 fps | 99.8% |
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 52 powders for .30-378 Weath. Mag. loaded with the .308 | 180gr | Hornady InterLock RN. ADI AR 2218 delivers the highest muzzle velocity at 3,238 fps; across all powders the maximum-charge window runs from 2,021 fps to 3,238 fps. Accurate 8700 gives the best case fill at 100 %, and 52 of the 52 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 180.0 gr projectile in 0.308" calls for a 1:16.5 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, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .30-378 Weath. Mag. with the .308 | 180gr | Hornady InterLock RN 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.