Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 155.8gr | Peregrine Glider GRM bullet and 65 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% | 56,695 psi | 89% | 3235 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,014 psi | 89% | 3264 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 54,795 psi | 86% | 3337 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 88% | 55,811 psi | 87% | 3340 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 86% | 54,549 psi | 85% | 3274 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 90% | 56,826 psi | 89% | 3350 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 98% | 55,259 psi | 87% | 3310 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,737 psi | 84% | 3330 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,607 psi | 86% | 3268 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 54,114 psi | 85% | 3258 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,058 psi | 89% | 3340 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 90% | 54,839 psi | 86% | 3245 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 54,955 psi | 86% | 3314 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,434 psi | 87% | 3333 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,348 psi | 90% | 3402 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,624 psi | 90% | 3297 fps | 97.7% |
| Bofors RP15 | <<locked>> | 92% | 56,231 psi | 88% | 3327 fps | 99.8% |
| Bofors RP30 | <<locked>> | 96% | 54,694 psi | 86% | 3320 fps | 99.5% |
| Bofors RP5 | <<locked>> | 90% | 57,058 psi | 89% | 3340 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 96% | 56,913 psi | 89% | 3340 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 88% | 56,057 psi | 88% | 3274 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 88% | 54,868 psi | 86% | 3255 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,824 psi | 86% | 3182 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 53,983 psi | 85% | 3402 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,333 psi | 59% | 2129 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,000 psi | 89% | 3251 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,435 psi | 90% | 3251 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,434 psi | 88% | 3255 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 90% | 54,911 psi | 86% | 3323 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,979 psi | 77% | 3228 fps | 98.7% |
| Lovex S065 | <<locked>> | 82% | 57,014 psi | 89% | 3225 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,434 psi | 87% | 3225 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 54,433 psi | 85% | 3199 fps | 100% |
| Norma 204 | <<locked>> | 82% | 54,578 psi | 86% | 3251 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 49,719 psi | 78% | 3255 fps | 99.9% |
| Norma MRP | <<locked>> | 88% | 57,116 psi | 90% | 3360 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,347 psi | 87% | 3245 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,173 psi | 88% | 3346 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 82% | 54,505 psi | 85% | 3248 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,636 psi | 86% | 3268 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,319 psi | 60% | 2182 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,377 psi | 90% | 3284 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,144 psi | 88% | 3317 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 54,998 psi | 86% | 3389 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 54,331 psi | 85% | 3337 fps | 98.7% |
| Rottweil R 904 | <<locked>> | 86% | 55,288 psi | 87% | 3241 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 88% | 57,493 psi | 90% | 3310 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,014 psi | 89% | 3225 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,434 psi | 87% | 3225 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,057 psi | 88% | 3173 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,087 psi | 89% | 3310 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 56,913 psi | 89% | 3228 fps | 99% |
| Somchem S365 | <<locked>> | 84% | 56,652 psi | 89% | 3245 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 54,172 psi | 85% | 3219 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 82% | 56,942 psi | 89% | 3232 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 54,172 psi | 85% | 3199 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 82% | 56,260 psi | 88% | 3238 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,521 psi | 89% | 3271 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,637 psi | 89% | 3356 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 94% | 57,348 psi | 90% | 3340 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 96% | 54,969 psi | 86% | 3343 fps | 98.3% |
| Vihtavuori N570 | <<locked>> | 98% | 56,057 psi | 88% | 3406 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,652 psi | 89% | 3176 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 54,288 psi | 85% | 3327 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,114 psi | 85% | 3212 fps | 99.7% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 39,972 psi | 63% | 2920 fps | 99.2% |
| Accurate 4350 | <<locked>> | 80% | 53,214 psi | 83% | 3202 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 44,019 psi | 69% | 3117 fps | 97.2% |
| Accurate MAGPRO | <<locked>> | 80% | 41,640 psi | 65% | 3048 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 44,367 psi | 70% | 3071 fps | 98.2% |
| ADI AR 2213 | <<locked>> | 80% | 39,595 psi | 62% | 2992 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 88% | 38,740 psi | 61% | 2963 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 84% | 30,574 psi | 48% | 2772 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,952 psi | 80% | 3205 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,338 psi | 69% | 3064 fps | 98.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,147 psi | 63% | 2995 fps | 97.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,812 psi | 61% | 2946 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,475 psi | 52% | 2854 fps | 98.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,859 psi | 69% | 3120 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 49,037 psi | 77% | 3245 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,369 psi | 74% | 3100 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 37,289 psi | 58% | 2923 fps | 96.1% |
| Bofors RP30 | <<locked>> | 86% | 38,392 psi | 60% | 2972 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 40,147 psi | 63% | 2995 fps | 97.2% |
| Hodgdon H1000 | <<locked>> | 84% | 36,753 psi | 58% | 2913 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 80% | 42,250 psi | 66% | 3002 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,452 psi | 65% | 2979 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,950 psi | 75% | 3071 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 82% | 35,070 psi | 55% | 2956 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,934 psi | 44% | 1909 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,082 psi | 78% | 3130 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 50,270 psi | 79% | 3136 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,540 psi | 68% | 2999 fps | 96.6% |
| IMR 7828 SSC | <<locked>> | 80% | 38,334 psi | 60% | 2966 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 92% | 36,796 psi | 58% | 2946 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 53,432 psi | 84% | 3169 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,938 psi | 81% | 3163 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,127 psi | 53% | 2776 fps | 97.7% |
| Norma 204 | <<locked>> | 80% | 50,894 psi | 80% | 3182 fps | 99.2% |
| Norma 217 | <<locked>> | 88% | 32,068 psi | 50% | 2835 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 42,569 psi | 67% | 3077 fps | 99% |
| Norma URP | <<locked>> | 80% | 51,764 psi | 81% | 3182 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,145 psi | 60% | 2972 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 50,879 psi | 80% | 3186 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,098 psi | 53% | 2831 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,631 psi | 45% | 1955 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,519 psi | 84% | 3225 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,228 psi | 82% | 3251 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 31,821 psi | 50% | 2841 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 42,728 psi | 67% | 3097 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 45,266 psi | 71% | 3045 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 80% | 43,700 psi | 68% | 3048 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,432 psi | 84% | 3169 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,938 psi | 81% | 3163 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,475 psi | 82% | 3114 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,395 psi | 68% | 3041 fps | 98.1% |
| Somchem S361 | <<locked>> | 80% | 46,325 psi | 73% | 3031 fps | 97.1% |
| Somchem S365 | <<locked>> | 80% | 49,327 psi | 77% | 3130 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,092 psi | 69% | 3022 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 80% | 53,287 psi | 84% | 3176 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,450 psi | 60% | 2881 fps | 97.3% |
| Vihtavuori N550 | <<locked>> | 80% | 52,562 psi | 82% | 3176 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,134 psi | 68% | 3031 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,424 psi | 66% | 3068 fps | 96.1% |
| Vihtavuori N565 | <<locked>> | 84% | 40,190 psi | 63% | 2992 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 90% | 43,947 psi | 69% | 3120 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 96% | 52,054 psi | 82% | 3330 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,765 psi | 83% | 3117 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,434 psi | 57% | 2989 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,625 psi | 64% | 2943 fps | 97.4% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 72 powders for .30-378 Weath. Mag. loaded with the .308 | 155.8gr | Peregrine Glider GRM. Vihtavuori N570 delivers the highest muzzle velocity at 3,406 fps; across all powders the maximum-charge window runs from 2,129 fps to 3,406 fps. ADI AR 2218 gives the best case fill at 100 %, and 72 of the 72 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 156.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-33 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, Alliant Reloder-50, 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.