Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 159gr | Hasler ARIETE bullet and 61 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>> | 90% | 57,653 psi | 90% | 3222 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 55,825 psi | 87% | 3330 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 88% | 57,000 psi | 89% | 3340 fps | 99% |
| ADI AR 2209 | <<locked>> | 86% | 55,448 psi | 87% | 3264 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 53,780 psi | 84% | 3271 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 98% | 56,275 psi | 88% | 3304 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,837 psi | 83% | 3340 fps | 96.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,998 psi | 86% | 3327 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,550 psi | 87% | 3255 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,158 psi | 86% | 3255 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 54,114 psi | 85% | 3264 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,854 psi | 88% | 3232 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,202 psi | 88% | 3307 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,565 psi | 89% | 3323 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 54,288 psi | 85% | 3323 fps | 97.1% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 54,926 psi | 86% | 3228 fps | 97.4% |
| Bofors RP15 | <<locked>> | 92% | 57,217 psi | 90% | 3317 fps | 99.9% |
| Bofors RP30 | <<locked>> | 96% | 55,927 psi | 88% | 3314 fps | 99.7% |
| Bofors RP5 | <<locked>> | 88% | 54,114 psi | 85% | 3264 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 94% | 53,940 psi | 85% | 3264 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 88% | 56,956 psi | 89% | 3268 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,738 psi | 87% | 3245 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,724 psi | 87% | 3173 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,085 psi | 86% | 3396 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,492 psi | 59% | 2116 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 54,244 psi | 85% | 3182 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 54,607 psi | 86% | 3182 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,421 psi | 90% | 3248 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 90% | 55,927 psi | 88% | 3317 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,980 psi | 78% | 3222 fps | 99% |
| Lovex S070 | <<locked>> | 82% | 56,246 psi | 88% | 3212 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 55,550 psi | 87% | 3189 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,477 psi | 87% | 3241 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 51,024 psi | 80% | 3251 fps | 100% |
| Norma MRP | <<locked>> | 86% | 54,157 psi | 85% | 3281 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,231 psi | 88% | 3232 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 57,261 psi | 90% | 3343 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 55,376 psi | 87% | 3238 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 55,680 psi | 87% | 3258 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,363 psi | 60% | 2165 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,348 psi | 90% | 3307 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 56,188 psi | 88% | 3383 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,637 psi | 87% | 3337 fps | 99% |
| Rottweil R 904 | <<locked>> | 86% | 56,144 psi | 88% | 3232 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 86% | 54,650 psi | 86% | 3238 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 82% | 56,246 psi | 88% | 3212 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,826 psi | 89% | 3163 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 54,259 psi | 85% | 3235 fps | 99.8% |
| Somchem S361 | <<locked>> | 86% | 57,725 psi | 90% | 3219 fps | 99.3% |
| Somchem S365 | <<locked>> | 84% | 57,638 psi | 90% | 3232 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,027 psi | 86% | 3205 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,027 psi | 86% | 3189 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 82% | 57,101 psi | 89% | 3225 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,711 psi | 90% | 3261 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 57,638 psi | 90% | 3350 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 92% | 54,433 psi | 85% | 3268 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 96% | 56,014 psi | 88% | 3340 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 98% | 57,377 psi | 90% | 3409 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,493 psi | 90% | 3163 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 55,738 psi | 87% | 3323 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,969 psi | 86% | 3202 fps | 99.8% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 40,741 psi | 64% | 2913 fps | 99.4% |
| Accurate High Country | <<locked>> | 80% | 44,889 psi | 70% | 3114 fps | 97.6% |
| Accurate MAGPRO | <<locked>> | 80% | 42,496 psi | 67% | 3045 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 45,150 psi | 71% | 3068 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 80% | 40,335 psi | 63% | 2986 fps | 96.2% |
| ADI AR 2217 | <<locked>> | 86% | 36,811 psi | 58% | 2890 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 98% | 49,095 psi | 77% | 3255 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 84% | 31,212 psi | 49% | 2776 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,866 psi | 81% | 3196 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,107 psi | 71% | 3058 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,930 psi | 64% | 2992 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,610 psi | 62% | 2940 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,171 psi | 54% | 2851 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,962 psi | 70% | 3117 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 50,241 psi | 79% | 3245 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 48,153 psi | 75% | 3097 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 38,029 psi | 60% | 2920 fps | 96.6% |
| Bofors RP30 | <<locked>> | 84% | 36,506 psi | 57% | 2900 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 40,930 psi | 64% | 2992 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 82% | 34,911 psi | 55% | 2841 fps | 95.1% |
| Hodgdon H4831 | <<locked>> | 80% | 42,989 psi | 67% | 2992 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,177 psi | 66% | 2976 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,747 psi | 76% | 3058 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 33,388 psi | 52% | 2881 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,978 psi | 44% | 1896 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,850 psi | 80% | 3120 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 51,111 psi | 80% | 3127 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,222 psi | 69% | 2992 fps | 97% |
| IMR 7828 SSC | <<locked>> | 80% | 39,088 psi | 61% | 2966 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 92% | 37,637 psi | 59% | 2946 fps | 95.7% |
| Lovex S070 | <<locked>> | 80% | 52,721 psi | 83% | 3153 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,824 psi | 55% | 2769 fps | 98.1% |
| Norma 204 | <<locked>> | 80% | 51,706 psi | 81% | 3176 fps | 99.4% |
| Norma 217 | <<locked>> | 88% | 32,837 psi | 51% | 2835 fps | 96% |
| Norma MRP | <<locked>> | 80% | 43,424 psi | 68% | 3071 fps | 99.2% |
| Norma URP | <<locked>> | 80% | 52,634 psi | 82% | 3173 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,986 psi | 61% | 2976 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 80% | 51,721 psi | 81% | 3176 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,853 psi | 55% | 2831 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,689 psi | 45% | 1939 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,229 psi | 83% | 3241 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 32,605 psi | 51% | 2848 fps | 96.6% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 40,480 psi | 63% | 3022 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 46,006 psi | 72% | 3038 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 80% | 44,498 psi | 70% | 3045 fps | 98.6% |
| Shooters World SW4350 | <<locked>> | 80% | 52,721 psi | 83% | 3153 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,214 psi | 83% | 3104 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,193 psi | 69% | 3038 fps | 98.5% |
| Somchem S361 | <<locked>> | 80% | 47,036 psi | 74% | 3025 fps | 97.5% |
| Somchem S365 | <<locked>> | 80% | 50,256 psi | 79% | 3117 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,860 psi | 70% | 3015 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 80% | 39,160 psi | 61% | 2877 fps | 97.7% |
| Vihtavuori N550 | <<locked>> | 80% | 53,388 psi | 84% | 3163 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,990 psi | 69% | 3022 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,250 psi | 68% | 3064 fps | 96.6% |
| Vihtavuori N565 | <<locked>> | 82% | 38,261 psi | 60% | 2920 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 88% | 41,698 psi | 65% | 3045 fps | 95% |
| Vihtavuori N570 | <<locked>> | 94% | 49,356 psi | 77% | 3251 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,766 psi | 84% | 3107 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,420 psi | 59% | 2986 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,350 psi | 65% | 2936 fps | 97.8% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 68 powders for .30-378 Weath. Mag. loaded with the .308 | 159gr | Hasler ARIETE. Vihtavuori N570 delivers the highest muzzle velocity at 3,409 fps; across all powders the maximum-charge window runs from 2,116 fps to 3,409 fps. Accurate 8700 gives the best case fill at 100 %, and 68 of the 68 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 159.0 gr projectile in 0.308" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, ADI AR 2225 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.