Load Specifications
Load data in caliber 7.5 x 55 Swiss with .308 | 184gr | RWS Evolution bullet and 94 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and ReloadSwiss RS 70.
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% | 48,965 psi | 89% | 2549 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 47,036 psi | 85% | 2575 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 48,631 psi | 88% | 2635 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 49,705 psi | 90% | 2615 fps | 97.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 37,144 psi | 67% | 2523 fps | 96.6% |
| Accurate 4064 | <<locked>> | 88% | 47,108 psi | 85% | 2621 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 48,791 psi | 89% | 2740 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 47,993 psi | 87% | 2651 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 48,849 psi | 89% | 2651 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 82% | 47,340 psi | 86% | 2605 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 47,369 psi | 86% | 2579 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 46,731 psi | 85% | 2753 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 48,385 psi | 88% | 2671 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 49,240 psi | 89% | 2694 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 47,863 psi | 87% | 2749 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 48,588 psi | 88% | 2785 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,303 psi | 66% | 2562 fps | 99.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,074 psi | 73% | 2710 fps | 98.7% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 47,210 psi | 86% | 2661 fps | 99.7% |
| Bofors RP3 | <<locked>> | 90% | 48,617 psi | 88% | 2684 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 49,429 psi | 90% | 2657 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 49,066 psi | 89% | 2585 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 48,979 psi | 89% | 2677 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 49,690 psi | 90% | 2697 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 96% | 48,762 psi | 88% | 2743 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 92% | 47,065 psi | 85% | 2657 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 84% | 48,443 psi | 88% | 2661 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,108 psi | 85% | 2677 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 47,065 psi | 85% | 2690 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 49,298 psi | 89% | 2772 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,128 psi | 64% | 1624 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 49,588 psi | 90% | 2661 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 47,906 psi | 87% | 2638 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 48,341 psi | 88% | 2631 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 48,747 psi | 88% | 2615 fps | 97.9% |
| IMR 4350 | <<locked>> | 98% | 49,313 psi | 89% | 2680 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 92% | 48,312 psi | 88% | 2641 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,603 psi | 90% | 2733 fps | 99.8% |
| IMR 4895 | <<locked>> | 86% | 47,166 psi | 86% | 2671 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 47,340 psi | 86% | 2605 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 46,992 psi | 85% | 2625 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 48,051 psi | 87% | 2582 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 48,095 psi | 87% | 2628 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 47,355 psi | 86% | 2635 fps | 98.8% |
| Lovex S070 | <<locked>> | 96% | 47,979 psi | 87% | 2667 fps | 98.1% |
| Norma 201 | <<locked>> | 84% | 46,847 psi | 85% | 2598 fps | 100% |
| Norma 202 | <<locked>> | 84% | 47,311 psi | 86% | 2602 fps | 100% |
| Norma 203B | <<locked>> | 88% | 48,457 psi | 88% | 2680 fps | 100% |
| Norma 204 | <<locked>> | 98% | 49,429 psi | 90% | 2723 fps | 96.4% |
| Norma MRPᴾ | <<locked>> | 100% | 40,219 psi | 73% | 2667 fps | 96% |
| Norma URP | <<locked>> | 98% | 48,573 psi | 88% | 2736 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 88% | 48,167 psi | 87% | 2700 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 47,558 psi | 86% | 2733 fps | 98.7% |
| Ramshot TAC | <<locked>> | 82% | 47,224 psi | 86% | 2618 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 84% | 49,835 psi | 90% | 2687 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,723 psi | 65% | 1667 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 47,094 psi | 85% | 2628 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 48,921 psi | 89% | 2749 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 48,472 psi | 88% | 2785 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 48,602 psi | 88% | 2769 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 49,037 psi | 89% | 2795 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 48,095 psi | 87% | 2579 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 47,413 psi | 86% | 2595 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 48,443 psi | 88% | 2674 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 49,429 psi | 90% | 2657 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 94% | 47,355 psi | 86% | 2635 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 84% | 46,992 psi | 85% | 2625 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 48,095 psi | 87% | 2628 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 47,979 psi | 87% | 2667 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 46,833 psi | 85% | 2687 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 48,660 psi | 88% | 2644 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 49,501 psi | 90% | 2671 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 48,515 psi | 88% | 2536 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 48,559 psi | 88% | 2543 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 47,398 psi | 86% | 2585 fps | 97.7% |
| Somchem S335 | <<locked>> | 84% | 47,892 psi | 87% | 2539 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 48,167 psi | 87% | 2638 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 49,182 psi | 89% | 2677 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,253 psi | 84% | 2736 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 43,062 psi | 78% | 2621 fps | 96.4% |
| Vihtavuori N133 | <<locked>> | 84% | 48,747 psi | 88% | 2523 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 46,847 psi | 85% | 2562 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 47,587 psi | 86% | 2579 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 47,166 psi | 86% | 2608 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 47,761 psi | 87% | 2680 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 47,311 psi | 86% | 2598 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 49,081 psi | 89% | 2628 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 46,920 psi | 85% | 2690 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,088 psi | 71% | 2631 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 48,211 psi | 87% | 2661 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 46,702 psi | 85% | 2644 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 49,095 psi | 89% | 2749 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,372 psi | 59% | 2569 fps | 99.3% |
| Winchester StaBALL Match | <<locked>> | 86% | 48,863 psi | 89% | 2677 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% | 45,992 psi | 83% | 2507 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,595 psi | 70% | 2448 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,411 psi | 82% | 2589 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 41,017 psi | 74% | 2467 fps | 95.3% |
| Accurate 3100 | <<locked>> | 96% | 32,372 psi | 59% | 2425 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 36,492 psi | 66% | 2448 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 28,311 psi | 51% | 2336 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 42,250 psi | 77% | 2552 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 36,027 psi | 65% | 2418 fps | 98.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,295 psi | 80% | 2556 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 44,338 psi | 80% | 2536 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 38,218 psi | 69% | 2589 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,346 psi | 64% | 2438 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,072 psi | 69% | 2497 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 29,385 psi | 53% | 2349 fps | 95.5% |
| Alliant Reloder-17 | 43.4 gr | 80% | 30,472 psi | 55% | 2415 fps | 97.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 25,353 psi | 46% | 2267 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 92% | 30,472 psi | 55% | 2474 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,379 psi | 75% | 2562 fps | 99% |
| Bofors RP3 | <<locked>> | 80% | 34,983 psi | 63% | 2444 fps | 99.3% |
| Bofors RP7 | <<locked>> | 88% | 40,944 psi | 74% | 2510 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,253 psi | 84% | 2543 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,830 psi | 78% | 2582 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 35,795 psi | 65% | 2444 fps | 97.3% |
| Hodgdon H414 | <<locked>> | 88% | 37,739 psi | 68% | 2539 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 88% | 41,495 psi | 75% | 2556 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 42,641 psi | 77% | 2562 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 25,309 psi | 46% | 2208 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,609 psi | 70% | 2543 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 90% | 40,118 psi | 73% | 2605 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,339 psi | 48% | 1453 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,031 psi | 74% | 2520 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 42,047 psi | 76% | 2549 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,811 psi | 69% | 2444 fps | 98.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 40,263 psi | 73% | 2461 fps | 96% |
| IMR 4350 | <<locked>> | 92% | 40,959 psi | 74% | 2536 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 37,855 psi | 69% | 2448 fps | 95.2% |
| IMR 4831 | <<locked>> | 82% | 27,804 psi | 50% | 2300 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 38,986 psi | 71% | 2526 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 44,295 psi | 80% | 2556 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,191 psi | 75% | 2533 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 42,641 psi | 77% | 2490 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 37,637 psi | 68% | 2451 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 32,808 psi | 60% | 2349 fps | 95.3% |
| Lovex S070 | <<locked>> | 88% | 37,449 psi | 68% | 2474 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 41,466 psi | 75% | 2507 fps | 100% |
| Norma 202 | <<locked>> | 80% | 41,553 psi | 75% | 2510 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,463 psi | 68% | 2487 fps | 99.1% |
| Norma 204 | <<locked>> | 96% | 46,209 psi | 84% | 2667 fps | 95.6% |
| Norma MRP | <<locked>> | 98% | 37,623 psi | 68% | 2612 fps | 95.1% |
| Norma URP | <<locked>> | 82% | 29,138 psi | 53% | 2343 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 36,811 psi | 67% | 2497 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 34,476 psi | 63% | 2474 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 44,309 psi | 80% | 2569 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,671 psi | 79% | 2589 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,484 psi | 48% | 1486 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 36,434 psi | 66% | 2428 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,711 psi | 72% | 2592 fps | 99.2% |
| ReloadSwiss RS 60 | 43.4 gr | 80% | 32,416 psi | 59% | 2474 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 30,327 psi | 55% | 2405 fps | 95.7% |
| ReloadSwiss RS 70 | 47.4 gr | 86% | 32,793 psi | 60% | 2457 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 45,585 psi | 83% | 2539 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,450 psi | 72% | 2461 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 32,953 psi | 60% | 2392 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 88% | 40,944 psi | 74% | 2510 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 82% | 32,808 psi | 60% | 2349 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,191 psi | 75% | 2533 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 37,637 psi | 68% | 2451 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 37,449 psi | 68% | 2474 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,895 psi | 62% | 2441 fps | 98.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,293 psi | 77% | 2539 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,872 psi | 74% | 2526 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,062 psi | 78% | 2457 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,679 psi | 65% | 2336 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 36,230 psi | 66% | 2388 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 42,496 psi | 77% | 2457 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,177 psi | 77% | 2539 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 33,808 psi | 61% | 2395 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 24,497 psi | 44% | 2247 fps | 96.9% |
| Somchem S385 | <<locked>> | 98% | 40,466 psi | 73% | 2572 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 43,323 psi | 79% | 2448 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,841 psi | 70% | 2441 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,523 psi | 72% | 2454 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,169 psi | 58% | 2339 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 82% | 30,545 psi | 55% | 2343 fps | 95.9% |
| Vihtavuori N530 | <<locked>> | 80% | 44,454 psi | 81% | 2556 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 37,898 psi | 69% | 2448 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 29,849 psi | 54% | 2346 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 88% | 26,745 psi | 49% | 2336 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,660 psi | 52% | 2270 fps | 97.2% |
| Winchester 748 | <<locked>> | 80% | 43,859 psi | 80% | 2598 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 37,739 psi | 68% | 2539 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 92% | 25,208 psi | 46% | 2329 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,190 psi | 73% | 2533 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 112 powders for 7.5 x 55 Swiss loaded with the .308 | 184gr | RWS Evolution. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,795 fps; across all powders the maximum-charge window runs from 1,624 fps to 2,795 fps. Accurate 3100 gives the best case fill at 100 %, and 112 of the 112 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (380 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 184.0 gr projectile in 0.308" calls for a 1:13.0 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. Alliant Reloder-17, ReloadSwiss RS 60, ReloadSwiss RS 70 rank at the top here: for 7.5 x 55 Swiss with the .308 | 184gr | RWS Evolution 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.