Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 155gr | Nosler Custom Competition bullet and 56 powders. The key underlying parameters are shown in the table above.
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% | 56,449 psi | 88% | 3232 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 54,389 psi | 85% | 3333 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 86% | 55,492 psi | 87% | 3340 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 86% | 57,638 psi | 90% | 3330 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 88% | 56,086 psi | 88% | 3340 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 96% | 54,853 psi | 86% | 3310 fps | 99.6% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,666 psi | 87% | 3425 fps | 97.5% |
| ADI AR 2225 | <<locked>> | 98% | 53,911 psi | 84% | 3333 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,580 psi | 90% | 3320 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,130 psi | 90% | 3317 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,550 psi | 89% | 3337 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 54,621 psi | 86% | 3241 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,056 psi | 86% | 3317 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,274 psi | 87% | 3330 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,334 psi | 90% | 3402 fps | 97.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 52,982 psi | 83% | 3310 fps | 96.2% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,855 psi | 89% | 3294 fps | 97.7% |
| Bofors RP15 | <<locked>> | 90% | 55,898 psi | 88% | 3323 fps | 99.8% |
| Bofors RP30 | <<locked>> | 94% | 54,781 psi | 86% | 3323 fps | 99.6% |
| Bofors RP5 | <<locked>> | 88% | 56,550 psi | 89% | 3337 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 94% | 56,420 psi | 88% | 3337 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 55,114 psi | 86% | 3264 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 86% | 54,186 psi | 85% | 3251 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 54,114 psi | 85% | 3176 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 53,969 psi | 85% | 3399 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,565 psi | 59% | 2152 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,130 psi | 88% | 3245 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,826 psi | 89% | 3248 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,666 psi | 87% | 3248 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 88% | 54,520 psi | 85% | 3320 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,968 psi | 83% | 3304 fps | 99.4% |
| Lovex S071 | <<locked>> | 92% | 54,665 psi | 86% | 3202 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,464 psi | 90% | 3307 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 53,983 psi | 85% | 3330 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,681 psi | 89% | 3356 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 55,782 psi | 87% | 3346 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 82% | 57,493 psi | 90% | 3304 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 54,317 psi | 85% | 3264 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,580 psi | 60% | 2201 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 54,926 psi | 86% | 3386 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,346 psi | 85% | 3337 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 84% | 54,534 psi | 85% | 3232 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 86% | 57,014 psi | 89% | 3307 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,623 psi | 89% | 3307 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 55,927 psi | 88% | 3219 fps | 99% |
| Somchem S365 | <<locked>> | 82% | 56,217 psi | 88% | 3241 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,334 psi | 90% | 3274 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,290 psi | 90% | 3255 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,753 psi | 89% | 3271 fps | 96% |
| Vihtavuori N555 | <<locked>> | 86% | 56,492 psi | 89% | 3274 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,101 psi | 88% | 3353 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 92% | 57,159 psi | 90% | 3340 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 94% | 54,853 psi | 86% | 3343 fps | 98.4% |
| Vihtavuori N570 | <<locked>> | 96% | 56,246 psi | 88% | 3412 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 54,491 psi | 85% | 3330 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,217 psi | 90% | 3268 fps | 99.9% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 43,018 psi | 67% | 2989 fps | 99.6% |
| Accurate High Country | <<locked>> | 80% | 47,210 psi | 74% | 3192 fps | 98.1% |
| Accurate MAGPRO | <<locked>> | 80% | 44,672 psi | 70% | 3120 fps | 96.3% |
| ADI AR 2209 | <<locked>> | 80% | 47,007 psi | 74% | 3130 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 42,264 psi | 66% | 3061 fps | 96.7% |
| ADI AR 2217 | <<locked>> | 86% | 38,667 psi | 61% | 2966 fps | 96% |
| ADI AR 2218 | <<locked>> | 96% | 47,921 psi | 75% | 3255 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 82% | 30,908 psi | 48% | 2785 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,940 psi | 85% | 3261 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,905 psi | 74% | 3123 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,018 psi | 67% | 3068 fps | 98.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,727 psi | 65% | 3009 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,100 psi | 57% | 2927 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,442 psi | 74% | 3192 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 49,182 psi | 77% | 3248 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 98% | 49,037 psi | 77% | 3228 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 46,746 psi | 73% | 3094 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 40,016 psi | 63% | 2995 fps | 97.2% |
| Bofors RP30 | <<locked>> | 82% | 36,100 psi | 57% | 2910 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 43,018 psi | 67% | 3068 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 82% | 36,709 psi | 58% | 2913 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 80% | 44,889 psi | 70% | 3064 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,092 psi | 69% | 3045 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,734 psi | 80% | 3120 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 35,244 psi | 55% | 2963 fps | 96.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,253 psi | 44% | 1932 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,620 psi | 82% | 3182 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 53,200 psi | 83% | 3189 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,847 psi | 72% | 3058 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 80% | 40,988 psi | 64% | 3038 fps | 96.4% |
| IMR 8133 Enduron | <<locked>> | 90% | 37,405 psi | 59% | 2963 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 37,014 psi | 58% | 2848 fps | 98.6% |
| Norma 204 | <<locked>> | 80% | 53,635 psi | 84% | 3241 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 32,721 psi | 51% | 2851 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 45,716 psi | 72% | 3146 fps | 99.5% |
| Ramshot Grand | <<locked>> | 80% | 41,060 psi | 64% | 3048 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 80% | 53,722 psi | 84% | 3241 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,014 psi | 58% | 2910 fps | 97.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,979 psi | 45% | 1978 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,606 psi | 54% | 2930 fps | 97.4% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 43,105 psi | 68% | 3107 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 47,790 psi | 75% | 3104 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 80% | 46,499 psi | 73% | 3110 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,151 psi | 72% | 3107 fps | 98.8% |
| Somchem S361 | <<locked>> | 80% | 48,892 psi | 77% | 3087 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 52,489 psi | 82% | 3182 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,963 psi | 74% | 3084 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 80% | 41,031 psi | 64% | 2946 fps | 98.1% |
| Vihtavuori N170 | <<locked>> | 92% | 53,011 psi | 83% | 3202 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 46,325 psi | 73% | 3097 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,382 psi | 71% | 3140 fps | 97.1% |
| Vihtavuori N565 | <<locked>> | 82% | 40,509 psi | 63% | 2999 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 88% | 44,150 psi | 69% | 3127 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 92% | 48,573 psi | 76% | 3258 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,943 psi | 63% | 3064 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,308 psi | 68% | 3005 fps | 98.2% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 62 powders for .30-378 Weath. Mag. loaded with the .308 | 155gr | Nosler Custom Competition. ADI AR 2218 delivers the highest muzzle velocity at 3,425 fps; across all powders the maximum-charge window runs from 2,152 fps to 3,425 fps. Accurate 8700 gives the best case fill at 100 %, and 62 of the 62 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 1:14.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, 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. As outliers, Accurate 8700, IMR 7977 Enduron, Lovex D100 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.