Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | NorthFork Bonded Core bullet and 50 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ADI AR 2218 and Vihtavuori N570.
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>> | 86% | 56,869 psi | 89% | 3045 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 48,240 psi | 76% | 3002 fps | 96.4% |
| Accurate MAGPRO | <<locked>> | 84% | 55,941 psi | 88% | 3156 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 82% | 54,186 psi | 85% | 3077 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 56,637 psi | 89% | 3156 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 55,666 psi | 87% | 3133 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 56,304 psi | 88% | 3264 fps | 98.9% |
| ADI AR 2225 | <<locked>> | 96% | 55,114 psi | 86% | 3156 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,421 psi | 90% | 3123 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 57,130 psi | 90% | 3146 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,288 psi | 87% | 3048 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,999 psi | 88% | 3127 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,941 psi | 88% | 3136 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 54,186 psi | 85% | 3166 fps | 98.2% |
| Alliant Reloder-50 | <<locked>> | 98% | 54,157 psi | 85% | 3156 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,855 psi | 89% | 3114 fps | 98.8% |
| Bofors RP15 | <<locked>> | 88% | 56,492 psi | 89% | 3136 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 55,724 psi | 87% | 3146 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 57,130 psi | 90% | 3146 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 57,319 psi | 90% | 3156 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 55,332 psi | 87% | 3081 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 84% | 54,346 psi | 85% | 3064 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,405 psi | 87% | 3225 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,884 psi | 59% | 2005 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,651 psi | 87% | 3058 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 86% | 55,201 psi | 87% | 3140 fps | 99.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 54,172 psi | 85% | 3136 fps | 99.9% |
| Lovex S071 | <<locked>> | 90% | 55,201 psi | 87% | 3018 fps | 100% |
| Norma 217 | <<locked>> | 98% | 55,521 psi | 87% | 3159 fps | 100% |
| Norma MRP | <<locked>> | 84% | 57,363 psi | 90% | 3166 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,492 psi | 89% | 3163 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 54,911 psi | 86% | 3084 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,856 psi | 61% | 2051 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 56,231 psi | 88% | 3209 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 55,463 psi | 87% | 3173 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 82% | 54,607 psi | 86% | 3045 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 57,334 psi | 90% | 3117 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 50,227 psi | 79% | 3015 fps | 96.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,956 psi | 89% | 3114 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 55,767 psi | 87% | 3031 fps | 99.7% |
| Somchem S385 | <<locked>> | 84% | 57,537 psi | 90% | 3081 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 57,696 psi | 90% | 3071 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,942 psi | 89% | 3097 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 84% | 57,174 psi | 90% | 3081 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 56,666 psi | 89% | 3169 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 54,056 psi | 85% | 3100 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 92% | 55,869 psi | 88% | 3176 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 94% | 57,334 psi | 90% | 3245 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 86% | 56,057 psi | 88% | 3143 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 57,392 psi | 90% | 3081 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% | 46,514 psi | 73% | 2874 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 44,715 psi | 70% | 2930 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 80% | 48,646 psi | 76% | 3025 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 80% | 50,560 psi | 79% | 3015 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 45,905 psi | 72% | 2959 fps | 98.9% |
| ADI AR 2217 | <<locked>> | 80% | 34,200 psi | 54% | 2684 fps | 95.9% |
| ADI AR 2218 | 109.7 gr | 92% | 45,121 psi | 71% | 3031 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 31,589 psi | 50% | 2654 fps | 97.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,401 psi | 79% | 3005 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,673 psi | 73% | 2963 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,455 psi | 71% | 2890 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,537 psi | 62% | 2835 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,953 psi | 81% | 3074 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 43,207 psi | 68% | 2946 fps | 95.4% |
| Alliant Reloder-50 | <<locked>> | 94% | 46,688 psi | 73% | 3012 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,801 psi | 69% | 2864 fps | 95.9% |
| Bofors RP15 | <<locked>> | 80% | 43,366 psi | 68% | 2894 fps | 99.1% |
| Bofors RP30 | <<locked>> | 80% | 36,970 psi | 58% | 2766 fps | 97% |
| Bofors RP5 | <<locked>> | 80% | 46,673 psi | 73% | 2963 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 80% | 37,260 psi | 58% | 2766 fps | 97.7% |
| Hodgdon H4831 | <<locked>> | 80% | 48,356 psi | 76% | 2956 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,471 psi | 74% | 2940 fps | 98.7% |
| Hodgdon Retumbo | 90 gr | 80% | 38,653 psi | 61% | 2890 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,500 psi | 45% | 1798 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,921 psi | 77% | 2940 fps | 99% |
| IMR 7828 SSC | <<locked>> | 80% | 44,672 psi | 70% | 2940 fps | 98.7% |
| IMR 8133 Enduron | <<locked>> | 84% | 33,562 psi | 53% | 2694 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 40,205 psi | 63% | 2749 fps | 99.8% |
| Norma 217 | <<locked>> | 80% | 29,428 psi | 46% | 2592 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 49,748 psi | 78% | 3038 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 45,107 psi | 71% | 2956 fps | 99% |
| Ramshot Magnum | <<locked>> | 80% | 40,756 psi | 64% | 2825 fps | 99.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,182 psi | 46% | 1837 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,116 psi | 60% | 2861 fps | 99.6% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 37,826 psi | 59% | 2812 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 51,184 psi | 80% | 2986 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 80% | 50,111 psi | 79% | 2995 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 46,818 psi | 73% | 2949 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,763 psi | 78% | 2992 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 52,301 psi | 82% | 2972 fps | 99.3% |
| Somchem S385 | <<locked>> | 80% | 50,517 psi | 79% | 2966 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,251 psi | 69% | 2838 fps | 99.6% |
| Vihtavuori N170 | <<locked>> | 88% | 49,879 psi | 78% | 2972 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 50,212 psi | 79% | 2969 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,240 psi | 77% | 3035 fps | 99% |
| Vihtavuori N565 | <<locked>> | 80% | 41,234 psi | 65% | 2848 fps | 97.6% |
| Vihtavuori N568 | <<locked>> | 82% | 38,914 psi | 61% | 2831 fps | 95.5% |
| Vihtavuori N570 | 102.8 gr | 88% | 46,195 psi | 72% | 3031 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 44,585 psi | 70% | 2959 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,760 psi | 73% | 2900 fps | 99.6% |
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 50 powders for .30-378 Weath. Mag. loaded with the .308 | 180gr | NorthFork Bonded Core. ADI AR 2218 delivers the highest muzzle velocity at 3,264 fps; across all powders the maximum-charge window runs from 2,005 fps to 3,264 fps. Accurate 8700 gives the best case fill at 100 %, and 50 of the 50 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:12.5 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. Hodgdon Retumbo, ADI AR 2218, Vihtavuori N570 rank at the top here: for .30-378 Weath. Mag. with the .308 | 180gr | NorthFork Bonded Core 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.