Load Specifications
Load data in caliber .30 Super Fl. H&H with .308 | 166gr | Copper Bear bullet and 19 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% | 39,552 psi | 85% | 2730 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 82% | 41,423 psi | 89% | 2831 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 90% | 39,871 psi | 86% | 2815 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 96% | 41,959 psi | 90% | 2890 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 88% | 41,133 psi | 89% | 2913 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 41,727 psi | 90% | 2772 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,753 psi | 79% | 1883 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 41,539 psi | 90% | 2779 fps | 99.2% |
| Lovex S071 | <<locked>> | 94% | 40,741 psi | 88% | 2756 fps | 97.8% |
| Norma MRP | <<locked>> | 88% | 40,915 psi | 88% | 2871 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 82% | 41,292 psi | 89% | 2805 fps | 97.8% |
| Ramshot Magnum | <<locked>> | 94% | 41,002 psi | 88% | 2822 fps | 96.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,507 psi | 81% | 1926 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 41,379 psi | 89% | 2858 fps | 98.9% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 40,770 psi | 88% | 2904 fps | 97% |
| Somchem S365 | <<locked>> | 84% | 41,872 psi | 90% | 2831 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 41,278 psi | 89% | 2769 fps | 96.4% |
| Vihtavuori N555 | <<locked>> | 88% | 41,959 psi | 90% | 2841 fps | 99.6% |
| Winchester StaBALL HD | <<locked>> | 94% | 40,828 psi | 88% | 2972 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 82% | 32,721 psi | 71% | 2569 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,972 psi | 84% | 2776 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,356 psi | 63% | 2539 fps | 97.6% |
| Alliant Reloder-25 | <<locked>> | 88% | 33,011 psi | 71% | 2661 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 31,401 psi | 68% | 2657 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,753 psi | 79% | 2667 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,601 psi | 59% | 1683 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 38,914 psi | 84% | 2720 fps | 98.8% |
| Lovex S071 | <<locked>> | 88% | 33,953 psi | 73% | 2598 fps | 95.7% |
| Norma MRP | <<locked>> | 84% | 35,940 psi | 77% | 2746 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 38,740 psi | 83% | 2746 fps | 97.2% |
| Ramshot Magnum | <<locked>> | 92% | 38,348 psi | 83% | 2759 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,181 psi | 61% | 1726 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,798 psi | 84% | 2795 fps | 98.3% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 38,130 psi | 82% | 2835 fps | 95.9% |
| Somchem S365 | <<locked>> | 80% | 36,695 psi | 79% | 2723 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 38,711 psi | 83% | 2710 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 32,547 psi | 70% | 2621 fps | 97.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,179 psi | 56% | 2523 fps | 96.8% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 19 powders for .30 Super Fl. H&H loaded with the .308 | 166gr | Copper Bear . Winchester StaBALL HD delivers the highest muzzle velocity at 2,972 fps; across all powders the maximum-charge window runs from 1,883 fps to 2,972 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 19 of the 19 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (320 MPa), the top charges use 79–90 %, leaving at least 10 % headroom. The 166.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.