Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 155gr | Norma Kalahari bullet and 58 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, 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>> | 88% | 55,274 psi | 87% | 3212 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 57,116 psi | 90% | 3383 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 86% | 54,244 psi | 85% | 3317 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 86% | 56,637 psi | 89% | 3314 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 54,911 psi | 86% | 3317 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 98% | 57,653 psi | 90% | 3356 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,230 psi | 85% | 3392 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,391 psi | 88% | 3376 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 56,811 psi | 89% | 3307 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,565 psi | 89% | 3304 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,188 psi | 88% | 3297 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,390 psi | 87% | 3314 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,188 psi | 90% | 3281 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 57,580 psi | 90% | 3356 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,027 psi | 85% | 3310 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 55,869 psi | 88% | 3379 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,869 psi | 88% | 3274 fps | 97.4% |
| Bofors RP15 | <<locked>> | 90% | 54,766 psi | 86% | 3301 fps | 99.7% |
| Bofors RP30 | <<locked>> | 96% | 57,334 psi | 90% | 3366 fps | 99.7% |
| Bofors RP5 | <<locked>> | 88% | 55,390 psi | 87% | 3314 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 94% | 55,172 psi | 86% | 3314 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 86% | 54,215 psi | 85% | 3248 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,840 psi | 89% | 3294 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,753 psi | 89% | 3215 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,478 psi | 89% | 3448 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,623 psi | 59% | 2146 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,114 psi | 86% | 3225 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 55,753 psi | 87% | 3228 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 54,766 psi | 86% | 3228 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 90% | 57,276 psi | 90% | 3366 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,561 psi | 81% | 3281 fps | 99.1% |
| Lovex S070 | <<locked>> | 82% | 57,319 psi | 90% | 3258 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 57,130 psi | 90% | 3241 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,492 psi | 89% | 3287 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 52,504 psi | 82% | 3307 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,477 psi | 87% | 3333 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,305 psi | 90% | 3278 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,331 psi | 85% | 3320 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 82% | 56,492 psi | 89% | 3287 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,232 psi | 90% | 3314 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,508 psi | 60% | 2195 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 57,725 psi | 90% | 3435 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 57,174 psi | 90% | 3389 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 86% | 57,116 psi | 90% | 3278 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 86% | 55,796 psi | 87% | 3287 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 82% | 57,319 psi | 90% | 3258 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,390 psi | 87% | 3281 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 54,984 psi | 86% | 3199 fps | 98.8% |
| Somchem S365 | <<locked>> | 82% | 55,027 psi | 86% | 3222 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,231 psi | 88% | 3255 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,202 psi | 88% | 3235 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 55,390 psi | 87% | 3258 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 54,969 psi | 86% | 3333 fps | 99% |
| Vihtavuori N565 | <<locked>> | 92% | 55,927 psi | 88% | 3320 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 96% | 57,508 psi | 90% | 3389 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 96% | 54,636 psi | 86% | 3379 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 90% | 57,232 psi | 90% | 3376 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,173 psi | 88% | 3248 fps | 99.8% |
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% | 42,177 psi | 66% | 2969 fps | 99.5% |
| Accurate High Country | <<locked>> | 80% | 46,166 psi | 72% | 3169 fps | 97.8% |
| Accurate MAGPRO | <<locked>> | 80% | 43,729 psi | 69% | 3097 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 46,137 psi | 72% | 3114 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 80% | 41,437 psi | 65% | 3038 fps | 96.4% |
| ADI AR 2217 | <<locked>> | 86% | 37,884 psi | 59% | 2943 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 98% | 50,328 psi | 79% | 3310 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 82% | 30,298 psi | 47% | 2762 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,514 psi | 73% | 3114 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,924 psi | 83% | 3245 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,079 psi | 72% | 3104 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,163 psi | 66% | 3048 fps | 97.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,828 psi | 64% | 2992 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,302 psi | 55% | 2907 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,369 psi | 73% | 3173 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 47,921 psi | 75% | 3222 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 49,008 psi | 77% | 3140 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 39,189 psi | 61% | 2972 fps | 96.8% |
| Bofors RP30 | <<locked>> | 84% | 37,840 psi | 59% | 2959 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 42,163 psi | 66% | 3048 fps | 97.8% |
| Hodgdon H1000 | <<locked>> | 82% | 36,013 psi | 56% | 2894 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 80% | 44,092 psi | 69% | 3045 fps | 96.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,294 psi | 68% | 3025 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,748 psi | 78% | 3104 fps | 100% |
| Hodgdon Retumbo | 91.1 gr | 80% | 34,490 psi | 54% | 2936 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,137 psi | 44% | 1923 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,779 psi | 81% | 3166 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 52,286 psi | 82% | 3173 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,107 psi | 71% | 3038 fps | 97% |
| IMR 7828 SSC | <<locked>> | 80% | 40,132 psi | 63% | 3015 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 92% | 39,015 psi | 61% | 3005 fps | 96% |
| Lovex S070 | <<locked>> | 80% | 53,853 psi | 84% | 3202 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,289 psi | 57% | 2831 fps | 98.4% |
| Norma 204 | <<locked>> | 80% | 52,663 psi | 83% | 3219 fps | 99.4% |
| Norma 217 | <<locked>> | 86% | 31,879 psi | 50% | 2828 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 44,730 psi | 70% | 3127 fps | 99.3% |
| Norma URP | <<locked>> | 80% | 53,737 psi | 84% | 3219 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,059 psi | 63% | 3025 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 80% | 52,692 psi | 83% | 3222 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,100 psi | 57% | 2887 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,877 psi | 45% | 1969 fps | 100% |
| ReloadSwiss RS 76 | 97.5 gr | 80% | 33,823 psi | 53% | 2907 fps | 97% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 41,989 psi | 66% | 3084 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 46,963 psi | 74% | 3084 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 80% | 45,629 psi | 72% | 3094 fps | 98.6% |
| Shooters World SW4350 | <<locked>> | 80% | 53,853 psi | 84% | 3202 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,281 psi | 71% | 3091 fps | 98.6% |
| Somchem S361 | <<locked>> | 80% | 48,051 psi | 75% | 3071 fps | 97.6% |
| Somchem S365 | <<locked>> | 80% | 51,474 psi | 81% | 3166 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,151 psi | 72% | 3068 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 80% | 40,234 psi | 63% | 2927 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 45,368 psi | 71% | 3077 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,411 psi | 70% | 3117 fps | 96.7% |
| Vihtavuori N565 | <<locked>> | 82% | 39,610 psi | 62% | 2979 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 88% | 43,004 psi | 67% | 3097 fps | 95.2% |
| Vihtavuori N570 | 111.1 gr | 94% | 50,894 psi | 80% | 3307 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,740 psi | 61% | 3041 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,525 psi | 67% | 2989 fps | 97.9% |
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 58 powders for .30-378 Weath. Mag. loaded with the .308 | 155gr | Norma Kalahari. Hodgdon Retumbo delivers the highest muzzle velocity at 3,448 fps; across all powders the maximum-charge window runs from 2,146 fps to 3,448 fps. ADI AR 2218 gives the best case fill at 100 %, and 58 of the 58 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 155.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .30-378 Weath. Mag. with the .308 | 155gr | Norma Kalahari 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.