Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 165gr | Fox Classic Hunter bullet and 55 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and ReloadSwiss RS 80.
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>> | 88% | 55,680 psi | 87% | 3146 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 54,868 psi | 86% | 3255 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 86% | 57,232 psi | 90% | 3248 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 55,825 psi | 87% | 3261 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 96% | 54,491 psi | 85% | 3228 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,955 psi | 86% | 3343 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 57,188 psi | 90% | 3314 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,406 psi | 90% | 3235 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,739 psi | 89% | 3232 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,159 psi | 88% | 3251 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 54,041 psi | 85% | 3153 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 54,433 psi | 85% | 3228 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,665 psi | 86% | 3241 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,681 psi | 89% | 3320 fps | 98% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 51,953 psi | 81% | 3225 fps | 96.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,507 psi | 89% | 3215 fps | 98.1% |
| Bofors RP15 | <<locked>> | 90% | 55,361 psi | 87% | 3238 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 54,186 psi | 85% | 3238 fps | 99.7% |
| Bofors RP5 | <<locked>> | 88% | 56,159 psi | 88% | 3251 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 55,941 psi | 88% | 3255 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 54,752 psi | 86% | 3186 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,682 psi | 90% | 3235 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,319 psi | 90% | 3143 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 57,580 psi | 90% | 3386 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,492 psi | 59% | 2083 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,796 psi | 87% | 3159 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,362 psi | 88% | 3163 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,245 psi | 87% | 3166 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 88% | 54,041 psi | 85% | 3235 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,214 psi | 82% | 3219 fps | 99.5% |
| Lovex S071 | <<locked>> | 94% | 57,421 psi | 90% | 3173 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,159 psi | 90% | 3222 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 53,214 psi | 83% | 3245 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,130 psi | 88% | 3268 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 55,187 psi | 86% | 3258 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 57,116 psi | 90% | 3219 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 53,650 psi | 84% | 3179 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,493 psi | 60% | 2133 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 54,346 psi | 85% | 3301 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 53,592 psi | 84% | 3255 fps | 99% |
| Rottweil R 904 | <<locked>> | 84% | 54,143 psi | 85% | 3150 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 86% | 56,449 psi | 88% | 3225 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,072 psi | 88% | 3219 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 55,434 psi | 87% | 3136 fps | 99.2% |
| Somchem S365 | <<locked>> | 82% | 55,738 psi | 87% | 3153 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,768 psi | 89% | 3189 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,782 psi | 89% | 3173 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,028 psi | 88% | 3189 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 86% | 55,854 psi | 88% | 3186 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,622 psi | 87% | 3271 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 92% | 56,550 psi | 89% | 3258 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 94% | 54,317 psi | 85% | 3261 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 96% | 55,492 psi | 87% | 3327 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 88% | 53,954 psi | 85% | 3245 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,739 psi | 89% | 3186 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% | 42,148 psi | 66% | 2900 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 80% | 44,106 psi | 69% | 3038 fps | 96.6% |
| ADI AR 2209 | <<locked>> | 80% | 46,557 psi | 73% | 3051 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 80% | 41,814 psi | 66% | 2982 fps | 97.1% |
| ADI AR 2217 | <<locked>> | 84% | 35,607 psi | 56% | 2822 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 96% | 47,326 psi | 74% | 3179 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 82% | 30,298 psi | 47% | 2707 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,650 psi | 84% | 3176 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,456 psi | 73% | 3041 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,482 psi | 67% | 2986 fps | 98.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,176 psi | 65% | 2927 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,462 psi | 56% | 2848 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,717 psi | 73% | 3104 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 48,443 psi | 76% | 3166 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 98% | 47,906 psi | 75% | 3140 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 46,311 psi | 73% | 3018 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 39,378 psi | 62% | 2913 fps | 97.5% |
| Bofors RP30 | <<locked>> | 82% | 35,462 psi | 56% | 2831 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 42,482 psi | 67% | 2986 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 80% | 33,678 psi | 53% | 2769 fps | 95.1% |
| Hodgdon H4831 | <<locked>> | 80% | 44,454 psi | 70% | 2986 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,642 psi | 68% | 2966 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,256 psi | 79% | 3035 fps | 100% |
| Hodgdon Retumbo | 90.1 gr | 80% | 34,650 psi | 54% | 2884 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,137 psi | 44% | 1867 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,214 psi | 82% | 3097 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 52,605 psi | 82% | 3100 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,426 psi | 71% | 2976 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 80% | 40,509 psi | 63% | 2959 fps | 96.8% |
| IMR 8133 Enduron | <<locked>> | 90% | 36,608 psi | 57% | 2877 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 36,187 psi | 57% | 2766 fps | 98.8% |
| Norma 204 | <<locked>> | 80% | 53,185 psi | 83% | 3156 fps | 99.7% |
| Norma 217 | <<locked>> | 86% | 31,981 psi | 50% | 2769 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 45,150 psi | 71% | 3064 fps | 99.6% |
| Ramshot Grand | <<locked>> | 80% | 40,480 psi | 63% | 2969 fps | 97.2% |
| Ramshot Hunter | <<locked>> | 80% | 53,229 psi | 83% | 3153 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,376 psi | 57% | 2828 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,863 psi | 45% | 1913 fps | 100% |
| ReloadSwiss RS 76 | 96.4 gr | 80% | 33,881 psi | 53% | 2848 fps | 97.7% |
| ReloadSwiss RS 80 | 104.5 gr | 86% | 39,117 psi | 61% | 2949 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 47,456 psi | 74% | 3025 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 80% | 45,948 psi | 72% | 3028 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,614 psi | 71% | 3025 fps | 99% |
| Somchem S361 | <<locked>> | 80% | 48,457 psi | 76% | 3012 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 51,909 psi | 81% | 3094 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,398 psi | 73% | 3005 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 80% | 40,437 psi | 63% | 2867 fps | 98.4% |
| Vihtavuori N170 | <<locked>> | 92% | 52,156 psi | 82% | 3120 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 45,658 psi | 72% | 3012 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,889 psi | 70% | 3058 fps | 97.5% |
| Vihtavuori N565 | <<locked>> | 80% | 36,999 psi | 58% | 2848 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 86% | 40,379 psi | 63% | 2972 fps | 95% |
| Vihtavuori N570 | <<locked>> | 92% | 47,776 psi | 75% | 3176 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,276 psi | 62% | 2976 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,830 psi | 67% | 2927 fps | 98.5% |
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 55 powders for .30-378 Weath. Mag. loaded with the .308 | 165gr | Fox Classic Hunter. Hodgdon Retumbo delivers the highest muzzle velocity at 3,386 fps; across all powders the maximum-charge window runs from 2,083 fps to 3,386 fps. ADI AR 2218 gives the best case fill at 100 %, and 55 of the 55 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 165.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-50 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, ReloadSwiss RS 76, ReloadSwiss RS 80 rank at the top here: for .30-378 Weath. Mag. with the .308 | 165gr | Fox Classic Hunter 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.