Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 165gr | Frontier PH HPBT bullet and 54 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, 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.
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Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 57,537 psi | 90% | 3169 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 55,492 psi | 87% | 3274 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 86% | 56,449 psi | 88% | 3278 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 84% | 54,839 psi | 86% | 3202 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 88% | 57,203 psi | 90% | 3281 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 96% | 55,970 psi | 88% | 3251 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 56,666 psi | 89% | 3373 fps | 98.2% |
| ADI AR 2225 | <<locked>> | 98% | 54,897 psi | 86% | 3271 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 55,071 psi | 86% | 3199 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 84% | 54,491 psi | 85% | 3189 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,653 psi | 90% | 3274 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,622 psi | 87% | 3173 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,043 psi | 88% | 3251 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,434 psi | 88% | 3264 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 54,201 psi | 85% | 3274 fps | 97.5% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 54,128 psi | 85% | 3261 fps | 97% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,595 psi | 90% | 3232 fps | 98.3% |
| Bofors RP15 | <<locked>> | 90% | 56,884 psi | 89% | 3258 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 55,898 psi | 88% | 3264 fps | 99.8% |
| Bofors RP5 | <<locked>> | 88% | 57,653 psi | 90% | 3274 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 57,624 psi | 90% | 3278 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 56,115 psi | 88% | 3205 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,143 psi | 86% | 3189 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,056 psi | 86% | 3107 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 55,085 psi | 86% | 3340 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,695 psi | 59% | 2087 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,913 psi | 89% | 3176 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,740 psi | 90% | 3179 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,449 psi | 88% | 3182 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 88% | 55,521 psi | 87% | 3261 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,925 psi | 85% | 3245 fps | 99.7% |
| Lovex S071 | <<locked>> | 92% | 55,637 psi | 87% | 3140 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 55,245 psi | 87% | 3274 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,740 psi | 90% | 3291 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,797 psi | 89% | 3284 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 90% | 55,317 psi | 87% | 3202 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,624 psi | 61% | 2133 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 56,260 psi | 88% | 3330 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 55,579 psi | 87% | 3284 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 84% | 55,245 psi | 87% | 3169 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 84% | 54,259 psi | 85% | 3182 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,537 psi | 90% | 3238 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,739 psi | 89% | 3156 fps | 99.4% |
| Somchem S365 | <<locked>> | 82% | 57,188 psi | 90% | 3169 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 54,563 psi | 86% | 3150 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 54,592 psi | 86% | 3133 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 57,595 psi | 90% | 3212 fps | 96.7% |
| Vihtavuori N555 | <<locked>> | 86% | 57,435 psi | 90% | 3205 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,116 psi | 90% | 3291 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 90% | 54,462 psi | 85% | 3219 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 94% | 56,014 psi | 88% | 3287 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 96% | 57,363 psi | 90% | 3356 fps | 97.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 55,898 psi | 88% | 3268 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 54,302 psi | 85% | 3140 fps | 99.9% |
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% | 43,888 psi | 69% | 2930 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 48,182 psi | 76% | 3136 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 80% | 45,658 psi | 72% | 3068 fps | 97.1% |
| ADI AR 2209 | <<locked>> | 80% | 47,877 psi | 75% | 3074 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 43,163 psi | 68% | 3009 fps | 97.5% |
| ADI AR 2217 | <<locked>> | 84% | 36,927 psi | 58% | 2851 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 96% | 48,762 psi | 76% | 3209 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 29,544 psi | 46% | 2680 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 48,225 psi | 76% | 3074 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,776 psi | 75% | 3068 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,932 psi | 69% | 3015 fps | 98.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,583 psi | 67% | 2946 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,927 psi | 58% | 2881 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,472 psi | 76% | 3130 fps | 100% |
| Alliant Reloder-33 | 112.3 gr | 92% | 46,659 psi | 73% | 3127 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 98% | 50,038 psi | 78% | 3182 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,425 psi | 70% | 2972 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 40,828 psi | 64% | 2943 fps | 97.9% |
| Bofors RP30 | <<locked>> | 82% | 36,927 psi | 58% | 2867 fps | 96.1% |
| Bofors RP5 | <<locked>> | 80% | 43,932 psi | 69% | 3015 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 80% | 34,969 psi | 55% | 2802 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 80% | 45,629 psi | 72% | 3005 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,947 psi | 70% | 2992 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,692 psi | 81% | 3054 fps | 100% |
| Hodgdon Retumbo | 90.5 gr | 80% | 36,085 psi | 57% | 2920 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,268 psi | 44% | 1870 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,447 psi | 84% | 3117 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 54,143 psi | 85% | 3120 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,601 psi | 73% | 2999 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 80% | 41,887 psi | 66% | 2989 fps | 97.2% |
| IMR 8133 Enduron | <<locked>> | 88% | 35,636 psi | 56% | 2848 fps | 95.3% |
| Lovex S071 | <<locked>> | 80% | 37,782 psi | 59% | 2795 fps | 99.1% |
| Norma 217 | <<locked>> | 84% | 31,227 psi | 49% | 2743 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 46,702 psi | 73% | 3094 fps | 99.8% |
| Ramshot Grand | <<locked>> | 80% | 42,003 psi | 66% | 2999 fps | 97.7% |
| Ramshot Magnum | <<locked>> | 80% | 37,913 psi | 59% | 2864 fps | 98.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,037 psi | 46% | 1913 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 35,375 psi | 55% | 2890 fps | 98.3% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 40,799 psi | 64% | 2986 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 48,573 psi | 76% | 3045 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 80% | 47,384 psi | 74% | 3054 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,050 psi | 74% | 3051 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 49,748 psi | 78% | 3031 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 53,505 psi | 84% | 3117 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,877 psi | 75% | 3028 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 80% | 41,800 psi | 66% | 2890 fps | 98.7% |
| Vihtavuori N170 | <<locked>> | 92% | 53,838 psi | 84% | 3146 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 47,195 psi | 74% | 3035 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,325 psi | 73% | 3084 fps | 97.8% |
| Vihtavuori N565 | <<locked>> | 80% | 38,508 psi | 60% | 2884 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 86% | 41,974 psi | 66% | 3005 fps | 95.6% |
| Vihtavuori N570 | 108 gr | 92% | 49,559 psi | 78% | 3209 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,046 psi | 64% | 3009 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,063 psi | 69% | 2949 fps | 98.7% |
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 54 powders for .30-378 Weath. Mag. loaded with the .308 | 165gr | Frontier PH HPBT. ADI AR 2218 delivers the highest muzzle velocity at 3,373 fps; across all powders the maximum-charge window runs from 2,087 fps to 3,373 fps. ADI AR 2218 gives the best case fill at 100 %, and 54 of the 54 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 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, Alliant Reloder-50, Hodgdon TrailBoss 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, Vihtavuori N570, Alliant Reloder-33 rank at the top here: for .30-378 Weath. Mag. with the .308 | 165gr | Frontier PH HPBT 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.