Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 166gr | Peregrine Glider (Glider Tactical) bullet and 60 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% | 55,114 psi | 86% | 3127 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 57,188 psi | 90% | 3301 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 86% | 54,273 psi | 85% | 3238 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 86% | 56,753 psi | 89% | 3228 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 55,216 psi | 87% | 3241 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 96% | 53,809 psi | 84% | 3209 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,331 psi | 85% | 3323 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,536 psi | 89% | 3294 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 56,898 psi | 89% | 3225 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,811 psi | 89% | 3219 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,289 psi | 88% | 3215 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,564 psi | 87% | 3235 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,159 psi | 90% | 3192 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 57,711 psi | 90% | 3271 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 53,853 psi | 84% | 3222 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 55,753 psi | 87% | 3301 fps | 97.8% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 51,068 psi | 80% | 3199 fps | 96.2% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,941 psi | 88% | 3196 fps | 97.9% |
| Bofors RP15 | <<locked>> | 90% | 54,766 psi | 86% | 3219 fps | 99.9% |
| Bofors RP30 | <<locked>> | 96% | 57,305 psi | 90% | 3284 fps | 99.9% |
| Bofors RP5 | <<locked>> | 88% | 55,564 psi | 87% | 3235 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 55,216 psi | 87% | 3232 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 54,215 psi | 85% | 3166 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,116 psi | 90% | 3219 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,768 psi | 89% | 3130 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,782 psi | 89% | 3366 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,579 psi | 59% | 2073 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,317 psi | 87% | 3143 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 55,825 psi | 87% | 3143 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 54,839 psi | 86% | 3150 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 90% | 57,319 psi | 90% | 3284 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,561 psi | 81% | 3199 fps | 99.4% |
| Lovex S070 | <<locked>> | 82% | 57,363 psi | 90% | 3173 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,811 psi | 89% | 3153 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,536 psi | 89% | 3205 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 52,518 psi | 82% | 3225 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,506 psi | 87% | 3251 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,464 psi | 90% | 3192 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,563 psi | 86% | 3241 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 82% | 56,478 psi | 89% | 3199 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,305 psi | 90% | 3228 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,479 psi | 60% | 2119 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 53,606 psi | 84% | 3281 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 57,087 psi | 89% | 3307 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 86% | 57,174 psi | 90% | 3192 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 86% | 55,999 psi | 88% | 3205 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 57,363 psi | 90% | 3173 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,608 psi | 87% | 3202 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 54,955 psi | 86% | 3120 fps | 99.2% |
| Somchem S365 | <<locked>> | 82% | 55,158 psi | 86% | 3136 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,202 psi | 88% | 3169 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,246 psi | 88% | 3156 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 55,492 psi | 87% | 3169 fps | 96.1% |
| Vihtavuori N555 | <<locked>> | 86% | 55,187 psi | 86% | 3166 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,042 psi | 86% | 3251 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 92% | 55,854 psi | 88% | 3238 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 96% | 57,522 psi | 90% | 3314 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 96% | 54,824 psi | 86% | 3307 fps | 97.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 57,493 psi | 90% | 3287 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,188 psi | 88% | 3166 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% | 41,785 psi | 65% | 2884 fps | 99.7% |
| Accurate High Country | <<locked>> | 80% | 46,093 psi | 72% | 3087 fps | 98.3% |
| Accurate MAGPRO | <<locked>> | 80% | 43,526 psi | 68% | 3018 fps | 96.5% |
| ADI AR 2209 | <<locked>> | 80% | 46,209 psi | 72% | 3035 fps | 99% |
| ADI AR 2213 | <<locked>> | 80% | 41,365 psi | 65% | 2963 fps | 97% |
| ADI AR 2217 | <<locked>> | 84% | 35,215 psi | 55% | 2802 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 96% | 46,688 psi | 73% | 3159 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 82% | 29,950 psi | 47% | 2690 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,572 psi | 73% | 3035 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,040 psi | 83% | 3156 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,108 psi | 72% | 3025 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,989 psi | 66% | 2969 fps | 98.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,669 psi | 64% | 2907 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,128 psi | 55% | 2831 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,209 psi | 72% | 3087 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 47,732 psi | 75% | 3143 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 98% | 47,195 psi | 74% | 3123 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 45,905 psi | 72% | 3002 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 39,015 psi | 61% | 2897 fps | 97.4% |
| Bofors RP30 | <<locked>> | 82% | 35,027 psi | 55% | 2815 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 41,989 psi | 66% | 2969 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 82% | 35,853 psi | 56% | 2825 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 80% | 44,005 psi | 69% | 2966 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,178 psi | 68% | 2949 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,850 psi | 78% | 3022 fps | 100% |
| Hodgdon Retumbo | 88.9 gr | 80% | 34,214 psi | 54% | 2861 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,108 psi | 44% | 1857 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,866 psi | 81% | 3084 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 52,228 psi | 82% | 3087 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,107 psi | 71% | 2959 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 80% | 40,016 psi | 63% | 2940 fps | 96.6% |
| IMR 8133 Enduron | <<locked>> | 90% | 36,071 psi | 57% | 2861 fps | 95.5% |
| Lovex S070 | <<locked>> | 80% | 53,766 psi | 84% | 3117 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,694 psi | 56% | 2743 fps | 98.6% |
| Norma 204 | <<locked>> | 80% | 52,707 psi | 83% | 3136 fps | 99.7% |
| Norma 217 | <<locked>> | 86% | 31,473 psi | 49% | 2749 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 44,672 psi | 70% | 3045 fps | 99.6% |
| Norma URP | <<locked>> | 80% | 53,766 psi | 84% | 3133 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,001 psi | 63% | 2949 fps | 97.1% |
| Ramshot Hunter | <<locked>> | 80% | 52,750 psi | 83% | 3136 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,940 psi | 56% | 2812 fps | 97.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,834 psi | 45% | 1903 fps | 100% |
| ReloadSwiss RS 76 | 95.2 gr | 80% | 33,518 psi | 53% | 2831 fps | 97.5% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 41,713 psi | 65% | 3005 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 46,963 psi | 74% | 3009 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 80% | 45,571 psi | 71% | 3012 fps | 99% |
| Shooters World SW4350 | <<locked>> | 80% | 53,766 psi | 84% | 3117 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,223 psi | 71% | 3009 fps | 98.9% |
| Somchem S361 | <<locked>> | 80% | 47,950 psi | 75% | 2992 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 51,474 psi | 81% | 3081 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,919 psi | 72% | 2986 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 80% | 40,118 psi | 63% | 2851 fps | 98.3% |
| Vihtavuori N170 | <<locked>> | 92% | 51,576 psi | 81% | 3100 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 80% | 45,092 psi | 71% | 2992 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,396 psi | 70% | 3041 fps | 97.3% |
| Vihtavuori N565 | <<locked>> | 82% | 39,233 psi | 61% | 2897 fps | 96% |
| Vihtavuori N568 | <<locked>> | 88% | 42,960 psi | 67% | 3025 fps | 95.9% |
| Vihtavuori N570 | 106.1 gr | 92% | 47,123 psi | 74% | 3153 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,667 psi | 61% | 2959 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,380 psi | 66% | 2910 fps | 98.4% |
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 60 powders for .30-378 Weath. Mag. loaded with the .308 | 166gr | Peregrine Glider (Glider Tactical). Hodgdon Retumbo delivers the highest muzzle velocity at 3,366 fps; across all powders the maximum-charge window runs from 2,073 fps to 3,366 fps. ADI AR 2218 gives the best case fill at 100 %, and 60 of the 60 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 166.0 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-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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .30-378 Weath. Mag. with the .308 | 166gr | Peregrine Glider (Glider Tactical) 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.