Load Specifications
Load data in caliber 7.5 x 55 Swiss with .308 | 180gr | Prvi Partizan SP bullet and 94 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, ReloadSwiss RS 60 and Alliant Reloder-17.
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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 31"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 82% | 49,559 psi | 90% | 2602 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 47,529 psi | 86% | 2625 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 49,240 psi | 89% | 2687 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 47,224 psi | 86% | 2618 fps | 96.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 37,826 psi | 69% | 2575 fps | 96.8% |
| Accurate 4064 | <<locked>> | 88% | 47,761 psi | 87% | 2674 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 49,661 psi | 90% | 2795 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 48,646 psi | 88% | 2703 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 49,647 psi | 90% | 2707 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 82% | 47,790 psi | 87% | 2654 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 48,037 psi | 87% | 2628 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 47,398 psi | 86% | 2808 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 49,255 psi | 89% | 2726 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 49,748 psi | 90% | 2746 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 48,631 psi | 88% | 2808 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 49,284 psi | 89% | 2841 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,666 psi | 67% | 2612 fps | 99.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,654 psi | 74% | 2766 fps | 98.8% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 47,906 psi | 87% | 2717 fps | 99.7% |
| Bofors RP3 | <<locked>> | 90% | 49,342 psi | 90% | 2736 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 46,876 psi | 85% | 2657 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 82% | 49,574 psi | 90% | 2638 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 49,777 psi | 90% | 2733 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 47,181 psi | 86% | 2700 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 96% | 49,472 psi | 90% | 2799 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 92% | 47,688 psi | 87% | 2713 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 84% | 49,124 psi | 89% | 2713 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,935 psi | 87% | 2733 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 47,819 psi | 87% | 2743 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 46,789 psi | 85% | 2776 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,317 psi | 64% | 1660 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 47,036 psi | 85% | 2667 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 48,515 psi | 88% | 2690 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 48,965 psi | 89% | 2684 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 49,226 psi | 89% | 2664 fps | 98% |
| IMR 4350 | <<locked>> | 96% | 46,891 psi | 85% | 2684 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 92% | 48,689 psi | 88% | 2690 fps | 97.9% |
| IMR 4831 | <<locked>> | 98% | 47,398 psi | 86% | 2743 fps | 99.7% |
| IMR 4895 | <<locked>> | 86% | 47,776 psi | 87% | 2723 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 47,790 psi | 87% | 2654 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 47,630 psi | 86% | 2674 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 48,486 psi | 88% | 2631 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 48,718 psi | 88% | 2684 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 47,979 psi | 87% | 2687 fps | 98.9% |
| Lovex S070 | <<locked>> | 96% | 48,457 psi | 88% | 2717 fps | 98.2% |
| Norma 201 | <<locked>> | 84% | 47,587 psi | 86% | 2651 fps | 100% |
| Norma 202 | <<locked>> | 84% | 47,790 psi | 87% | 2651 fps | 100% |
| Norma 203B | <<locked>> | 88% | 49,008 psi | 89% | 2733 fps | 100% |
| Norma 204 | <<locked>> | 96% | 46,862 psi | 85% | 2723 fps | 95.8% |
| Norma MRPᴾ | <<locked>> | 100% | 40,857 psi | 74% | 2723 fps | 96.3% |
| Norma URP | <<locked>> | 98% | 49,385 psi | 90% | 2792 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 88% | 49,081 psi | 89% | 2756 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 48,138 psi | 87% | 2785 fps | 98.8% |
| Ramshot TAC | <<locked>> | 82% | 47,674 psi | 87% | 2671 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 82% | 47,152 psi | 86% | 2690 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,636 psi | 65% | 1696 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 47,732 psi | 87% | 2684 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 49,516 psi | 90% | 2802 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 48,965 psi | 89% | 2838 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 49,226 psi | 89% | 2818 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 49,748 psi | 90% | 2851 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 48,747 psi | 88% | 2631 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 48,095 psi | 87% | 2651 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 49,240 psi | 89% | 2730 fps | 100% |
| Rottweil R 907 | <<locked>> | 92% | 46,876 psi | 85% | 2657 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 94% | 47,979 psi | 87% | 2687 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 84% | 47,630 psi | 86% | 2674 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 48,718 psi | 88% | 2684 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 48,457 psi | 88% | 2717 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 47,456 psi | 86% | 2740 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 49,081 psi | 89% | 2697 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 46,876 psi | 85% | 2674 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 49,066 psi | 89% | 2589 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 49,197 psi | 89% | 2592 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 47,935 psi | 87% | 2635 fps | 97.8% |
| Somchem S335 | <<locked>> | 84% | 48,588 psi | 88% | 2592 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 48,878 psi | 89% | 2690 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 46,804 psi | 85% | 2680 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,007 psi | 85% | 2789 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 43,903 psi | 80% | 2677 fps | 96.6% |
| Vihtavuori N133 | <<locked>> | 84% | 49,298 psi | 89% | 2575 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 47,355 psi | 86% | 2612 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 48,182 psi | 87% | 2628 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 47,892 psi | 87% | 2661 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 48,573 psi | 88% | 2736 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 48,022 psi | 87% | 2654 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 49,530 psi | 90% | 2677 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 47,645 psi | 86% | 2746 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,769 psi | 72% | 2684 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 48,950 psi | 89% | 2717 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 47,340 psi | 86% | 2697 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 49,806 psi | 90% | 2805 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,721 psi | 59% | 2618 fps | 99.4% |
| Winchester StaBALL Match | <<locked>> | 86% | 49,588 psi | 90% | 2730 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 31"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 46,659 psi | 85% | 2559 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,204 psi | 71% | 2497 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,774 psi | 83% | 2638 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 41,524 psi | 75% | 2516 fps | 95.4% |
| Accurate 3100 | <<locked>> | 96% | 33,025 psi | 60% | 2477 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 37,086 psi | 67% | 2497 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 28,732 psi | 52% | 2385 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 42,743 psi | 78% | 2605 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 36,521 psi | 66% | 2467 fps | 98.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,788 psi | 81% | 2605 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 44,759 psi | 81% | 2582 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 38,696 psi | 70% | 2641 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,853 psi | 65% | 2487 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,537 psi | 70% | 2546 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 29,892 psi | 54% | 2402 fps | 95.7% |
| Alliant Reloder-17 | 44.8 gr | 80% | 30,908 psi | 56% | 2464 fps | 98% |
| Alliant Reloder-23 | <<locked>> | 88% | 25,686 psi | 47% | 2313 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 92% | 30,966 psi | 56% | 2526 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,930 psi | 76% | 2612 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 35,433 psi | 64% | 2493 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 39,073 psi | 71% | 2513 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,789 psi | 85% | 2595 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,395 psi | 79% | 2631 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,448 psi | 66% | 2497 fps | 97.4% |
| Hodgdon H414 | <<locked>> | 88% | 38,101 psi | 69% | 2589 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 88% | 41,901 psi | 76% | 2605 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 43,149 psi | 78% | 2615 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 25,541 psi | 46% | 2251 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,986 psi | 71% | 2592 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 90% | 40,596 psi | 74% | 2657 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,295 psi | 48% | 1483 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,510 psi | 75% | 2572 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 42,728 psi | 78% | 2602 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,334 psi | 70% | 2497 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 40,698 psi | 74% | 2510 fps | 96.1% |
| IMR 4350 | <<locked>> | 90% | 38,914 psi | 71% | 2536 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 38,189 psi | 69% | 2493 fps | 95.3% |
| IMR 4831 | <<locked>> | 82% | 28,195 psi | 51% | 2346 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 39,479 psi | 72% | 2575 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 44,788 psi | 81% | 2605 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,669 psi | 76% | 2579 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,149 psi | 78% | 2543 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 38,203 psi | 69% | 2500 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 33,199 psi | 60% | 2395 fps | 95.4% |
| Lovex S070 | <<locked>> | 86% | 35,520 psi | 64% | 2470 fps | 95% |
| Norma 201 | <<locked>> | 80% | 41,989 psi | 76% | 2559 fps | 100% |
| Norma 202 | <<locked>> | 80% | 42,134 psi | 76% | 2562 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,927 psi | 69% | 2536 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 43,874 psi | 80% | 2667 fps | 95% |
| Norma MRP | <<locked>> | 98% | 38,319 psi | 70% | 2667 fps | 95.4% |
| Norma URP | <<locked>> | 82% | 29,515 psi | 54% | 2388 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 37,347 psi | 68% | 2549 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 34,998 psi | 64% | 2526 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 44,788 psi | 81% | 2621 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,251 psi | 80% | 2641 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,658 psi | 48% | 1519 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 36,767 psi | 67% | 2474 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,205 psi | 73% | 2644 fps | 99.2% |
| ReloadSwiss RS 60 | 44.8 gr | 80% | 32,924 psi | 60% | 2526 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 30,719 psi | 56% | 2451 fps | 95.8% |
| ReloadSwiss RS 70 | 48.9 gr | 86% | 33,257 psi | 60% | 2510 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 45,992 psi | 83% | 2589 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,016 psi | 73% | 2513 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 33,402 psi | 61% | 2441 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 86% | 39,073 psi | 71% | 2513 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 82% | 33,199 psi | 60% | 2395 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,669 psi | 76% | 2579 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,203 psi | 69% | 2500 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 35,520 psi | 64% | 2470 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,214 psi | 62% | 2487 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,844 psi | 78% | 2592 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,263 psi | 75% | 2575 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,439 psi | 79% | 2503 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,998 psi | 65% | 2382 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 36,753 psi | 67% | 2438 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 43,033 psi | 78% | 2507 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,714 psi | 78% | 2592 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 34,287 psi | 62% | 2444 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 24,831 psi | 45% | 2293 fps | 97% |
| Somchem S385 | <<locked>> | 96% | 38,435 psi | 70% | 2572 fps | 95% |
| Vihtavuori N133 | <<locked>> | 80% | 43,685 psi | 79% | 2493 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,291 psi | 71% | 2487 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,045 psi | 73% | 2500 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,634 psi | 59% | 2385 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 28,892 psi | 52% | 2336 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 44,962 psi | 82% | 2605 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 38,522 psi | 70% | 2497 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 30,168 psi | 55% | 2388 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 88% | 27,137 psi | 49% | 2385 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,008 psi | 53% | 2316 fps | 97.4% |
| Winchester 748 | <<locked>> | 80% | 44,280 psi | 80% | 2648 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 38,319 psi | 70% | 2592 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 92% | 25,498 psi | 46% | 2379 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,553 psi | 74% | 2579 fps | 99.7% |
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 113 powders for 7.5 x 55 Swiss loaded with the .308 | 180gr | Prvi Partizan SP. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,851 fps; across all powders the maximum-charge window runs from 1,660 fps to 2,851 fps. Accurate 3100 gives the best case fill at 100 %, and 113 of the 113 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (380 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, ADI AR 2213 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. ReloadSwiss RS 70, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for 7.5 x 55 Swiss with the .308 | 180gr | Prvi Partizan SP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2213, Alliant Reloder-22, Alliant Reloder-25 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.