Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 176gr | Peregrine Glider GRM bullet and 53 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 56,536 psi | 89% | 3074 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 54,737 psi | 86% | 3182 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 86% | 55,724 psi | 87% | 3189 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 84% | 54,230 psi | 85% | 3110 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 56,565 psi | 89% | 3186 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 96% | 55,274 psi | 87% | 3159 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,825 psi | 87% | 3281 fps | 98.5% |
| ADI AR 2225 | <<locked>> | 98% | 54,128 psi | 85% | 3179 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,566 psi | 90% | 3159 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,898 psi | 89% | 3179 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 54,955 psi | 86% | 3081 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,405 psi | 87% | 3156 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,564 psi | 87% | 3169 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,624 psi | 90% | 3261 fps | 98.6% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 52,765 psi | 83% | 3166 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,246 psi | 90% | 3146 fps | 98.6% |
| Bofors RP15 | <<locked>> | 90% | 56,246 psi | 88% | 3169 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 55,085 psi | 86% | 3169 fps | 99.9% |
| Bofors RP5 | <<locked>> | 88% | 56,898 psi | 89% | 3179 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 56,913 psi | 89% | 3186 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 55,506 psi | 87% | 3114 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 54,505 psi | 85% | 3097 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 54,433 psi | 85% | 3012 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 54,563 psi | 86% | 3248 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,579 psi | 59% | 2011 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,521 psi | 89% | 3084 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,145 psi | 90% | 3084 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,970 psi | 88% | 3094 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 88% | 54,940 psi | 86% | 3166 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,953 psi | 83% | 3153 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 54,607 psi | 86% | 3045 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,244 psi | 85% | 3179 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,101 psi | 89% | 3196 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,173 psi | 88% | 3192 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 90% | 54,592 psi | 86% | 3114 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,508 psi | 60% | 2057 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,274 psi | 87% | 3232 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,433 psi | 85% | 3192 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 84% | 54,766 psi | 86% | 3077 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 86% | 57,319 psi | 90% | 3150 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,927 psi | 89% | 3146 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,217 psi | 88% | 3068 fps | 99.5% |
| Somchem S365 | <<locked>> | 82% | 56,608 psi | 89% | 3077 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,493 psi | 90% | 3114 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,537 psi | 90% | 3100 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,681 psi | 89% | 3120 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 86% | 56,681 psi | 89% | 3110 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,565 psi | 89% | 3202 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 92% | 57,276 psi | 90% | 3189 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 94% | 55,158 psi | 86% | 3199 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 96% | 56,449 psi | 88% | 3264 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 88% | 55,013 psi | 86% | 3173 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,479 psi | 90% | 3110 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 42,888 psi | 67% | 2838 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 47,326 psi | 74% | 3041 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 80% | 44,744 psi | 70% | 2976 fps | 97.4% |
| ADI AR 2209 | <<locked>> | 80% | 47,326 psi | 74% | 2986 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 42,496 psi | 67% | 2920 fps | 97.8% |
| ADI AR 2217 | <<locked>> | 82% | 33,736 psi | 53% | 2700 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 94% | 44,411 psi | 70% | 3041 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 80% | 28,689 psi | 45% | 2592 fps | 95.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,210 psi | 74% | 2976 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,149 psi | 68% | 2923 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,901 psi | 66% | 2858 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,172 psi | 57% | 2789 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,645 psi | 75% | 3038 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 45,643 psi | 72% | 3035 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 96% | 45,150 psi | 71% | 3015 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 43,961 psi | 69% | 2890 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 40,074 psi | 63% | 2851 fps | 98.1% |
| Bofors RP30 | <<locked>> | 80% | 33,620 psi | 53% | 2710 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 43,149 psi | 68% | 2923 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 80% | 34,214 psi | 54% | 2717 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 80% | 45,121 psi | 71% | 2920 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,266 psi | 69% | 2904 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,952 psi | 80% | 2959 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 35,259 psi | 55% | 2828 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,195 psi | 44% | 1801 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,939 psi | 83% | 3025 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,403 psi | 84% | 3028 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,093 psi | 72% | 2910 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 80% | 41,162 psi | 65% | 2897 fps | 97.5% |
| IMR 8133 Enduron | <<locked>> | 88% | 34,780 psi | 55% | 2759 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 36,709 psi | 58% | 2703 fps | 99.2% |
| Norma 217 | <<locked>> | 84% | 30,313 psi | 48% | 2651 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 45,861 psi | 72% | 2999 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 41,321 psi | 65% | 2910 fps | 98% |
| Ramshot Magnum | <<locked>> | 80% | 37,072 psi | 58% | 2776 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,950 psi | 45% | 1847 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,592 psi | 54% | 2802 fps | 98.5% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 39,856 psi | 62% | 2897 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 48,008 psi | 75% | 2956 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 80% | 46,717 psi | 73% | 2963 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,383 psi | 73% | 2959 fps | 99.4% |
| Somchem S361 | <<locked>> | 80% | 48,979 psi | 77% | 2943 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 52,779 psi | 83% | 3018 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,050 psi | 74% | 2936 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 41,133 psi | 64% | 2805 fps | 98.9% |
| Vihtavuori N170 | <<locked>> | 90% | 49,414 psi | 77% | 2992 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 80% | 46,427 psi | 73% | 2943 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,556 psi | 71% | 2992 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 80% | 37,579 psi | 59% | 2792 fps | 96% |
| Vihtavuori N568 | <<locked>> | 86% | 41,104 psi | 64% | 2917 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 90% | 45,208 psi | 71% | 3041 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,205 psi | 63% | 2917 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,482 psi | 68% | 2864 fps | 99% |
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 | 176gr | Peregrine Glider GRM. ADI AR 2218 delivers the highest muzzle velocity at 3,281 fps; across all powders the maximum-charge window runs from 2,011 fps to 3,281 fps. Accurate 8700 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 176.0 gr projectile in 0.308" calls for a 1:10.0 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.