Load Specifications
Load data in caliber 7.5 x 55 Swiss with .308 | 181gr | RWS H-Mantel 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, Hodgdon Superformance 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% | 49,385 psi | 90% | 2589 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 47,645 psi | 86% | 2618 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 49,095 psi | 89% | 2674 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 47,123 psi | 86% | 2608 fps | 96.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 37,753 psi | 69% | 2566 fps | 96.8% |
| Accurate 4064 | <<locked>> | 88% | 47,659 psi | 86% | 2664 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 49,632 psi | 90% | 2785 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 48,530 psi | 88% | 2694 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 49,559 psi | 90% | 2694 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 82% | 47,616 psi | 86% | 2641 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 47,848 psi | 87% | 2615 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 47,311 psi | 86% | 2799 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 49,139 psi | 89% | 2713 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 49,632 psi | 90% | 2733 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 48,617 psi | 88% | 2795 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 48,965 psi | 89% | 2828 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,608 psi | 66% | 2602 fps | 99.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,683 psi | 74% | 2756 fps | 98.8% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 47,863 psi | 87% | 2703 fps | 99.7% |
| Bofors RP3 | <<locked>> | 90% | 49,240 psi | 89% | 2726 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 46,789 psi | 85% | 2648 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 82% | 49,690 psi | 90% | 2628 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 49,661 psi | 90% | 2720 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 47,094 psi | 85% | 2687 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 96% | 49,487 psi | 90% | 2789 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 92% | 47,630 psi | 86% | 2700 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 84% | 48,950 psi | 89% | 2703 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,587 psi | 86% | 2717 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 47,776 psi | 87% | 2733 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 46,499 psi | 84% | 2759 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,346 psi | 64% | 1654 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 46,891 psi | 85% | 2654 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 48,573 psi | 88% | 2680 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 48,878 psi | 89% | 2671 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 49,095 psi | 89% | 2654 fps | 98% |
| IMR 4350 | <<locked>> | 98% | 49,676 psi | 90% | 2720 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 92% | 48,602 psi | 88% | 2680 fps | 97.9% |
| IMR 4831 | <<locked>> | 98% | 47,311 psi | 86% | 2733 fps | 99.7% |
| IMR 4895 | <<locked>> | 86% | 47,630 psi | 86% | 2713 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 47,616 psi | 86% | 2641 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 47,485 psi | 86% | 2664 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 48,602 psi | 88% | 2625 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 48,631 psi | 88% | 2671 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 47,906 psi | 87% | 2674 fps | 98.9% |
| Lovex S070 | <<locked>> | 96% | 48,428 psi | 88% | 2707 fps | 98.2% |
| Norma 201 | <<locked>> | 84% | 47,442 psi | 86% | 2641 fps | 100% |
| Norma 202 | <<locked>> | 84% | 47,906 psi | 87% | 2641 fps | 100% |
| Norma 203B | <<locked>> | 88% | 48,878 psi | 89% | 2720 fps | 100% |
| Norma 204 | <<locked>> | 96% | 46,818 psi | 85% | 2713 fps | 95.8% |
| Norma MRPᴾ | <<locked>> | 100% | 40,872 psi | 74% | 2713 fps | 96.3% |
| Norma URP | <<locked>> | 98% | 49,037 psi | 89% | 2776 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 88% | 49,023 psi | 89% | 2746 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 48,109 psi | 87% | 2776 fps | 98.8% |
| Ramshot TAC | <<locked>> | 82% | 47,601 psi | 86% | 2657 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 82% | 47,065 psi | 85% | 2677 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,650 psi | 65% | 1690 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 47,674 psi | 87% | 2671 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 49,371 psi | 90% | 2792 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 48,950 psi | 89% | 2825 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 49,211 psi | 89% | 2808 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 49,487 psi | 90% | 2835 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 48,559 psi | 88% | 2618 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 47,935 psi | 87% | 2638 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 49,139 psi | 89% | 2717 fps | 100% |
| Rottweil R 907 | <<locked>> | 92% | 46,789 psi | 85% | 2648 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 94% | 47,906 psi | 87% | 2674 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 84% | 47,485 psi | 86% | 2664 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 48,631 psi | 88% | 2671 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 48,428 psi | 88% | 2707 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 47,384 psi | 86% | 2730 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 49,023 psi | 89% | 2684 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 46,804 psi | 85% | 2664 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 49,168 psi | 89% | 2579 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 49,037 psi | 89% | 2579 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 47,863 psi | 87% | 2625 fps | 97.8% |
| Somchem S335 | <<locked>> | 84% | 48,457 psi | 88% | 2579 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 48,791 psi | 89% | 2680 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 49,850 psi | 90% | 2720 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,949 psi | 85% | 2779 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 43,918 psi | 80% | 2667 fps | 96.6% |
| Vihtavuori N133 | <<locked>> | 84% | 49,414 psi | 90% | 2566 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 47,485 psi | 86% | 2605 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 48,080 psi | 87% | 2618 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 47,805 psi | 87% | 2648 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 48,559 psi | 88% | 2723 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 82% | 47,877 psi | 87% | 2641 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 49,429 psi | 90% | 2664 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 47,645 psi | 86% | 2733 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,494 psi | 72% | 2671 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 48,689 psi | 88% | 2700 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 47,471 psi | 86% | 2687 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 49,487 psi | 90% | 2789 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,692 psi | 59% | 2608 fps | 99.4% |
| Winchester StaBALL Match | <<locked>> | 86% | 49,501 psi | 90% | 2717 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% | 46,470 psi | 84% | 2546 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,030 psi | 71% | 2484 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,948 psi | 83% | 2628 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 41,394 psi | 75% | 2507 fps | 95.4% |
| Accurate 3100 | <<locked>> | 96% | 32,953 psi | 60% | 2467 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 36,927 psi | 67% | 2484 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 28,587 psi | 52% | 2372 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 42,844 psi | 78% | 2595 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 36,361 psi | 66% | 2454 fps | 98.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,918 psi | 82% | 2598 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 44,860 psi | 81% | 2575 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 38,609 psi | 70% | 2631 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,926 psi | 65% | 2480 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,638 psi | 70% | 2539 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 29,805 psi | 54% | 2388 fps | 95.7% |
| Alliant Reloder-17 | 44.5 gr | 80% | 30,806 psi | 56% | 2454 fps | 98% |
| Alliant Reloder-23 | <<locked>> | 88% | 25,628 psi | 47% | 2303 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 92% | 30,937 psi | 56% | 2516 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,800 psi | 76% | 2602 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 35,302 psi | 64% | 2480 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 38,957 psi | 71% | 2500 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,601 psi | 85% | 2582 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,294 psi | 79% | 2621 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,303 psi | 66% | 2484 fps | 97.4% |
| Hodgdon H414 | <<locked>> | 88% | 38,014 psi | 69% | 2575 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 88% | 41,829 psi | 76% | 2595 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 43,250 psi | 78% | 2605 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 25,570 psi | 46% | 2244 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,117 psi | 71% | 2582 fps | 99.8% |
| Hodgdon Superformance | 53 gr | 90% | 40,625 psi | 74% | 2648 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,252 psi | 48% | 1473 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,365 psi | 75% | 2559 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 42,554 psi | 77% | 2589 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,174 psi | 69% | 2484 fps | 98.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 40,799 psi | 74% | 2503 fps | 96.2% |
| IMR 4350 | <<locked>> | 90% | 38,885 psi | 71% | 2526 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 38,305 psi | 70% | 2487 fps | 95.4% |
| IMR 4831 | <<locked>> | 82% | 28,065 psi | 51% | 2336 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 39,566 psi | 72% | 2569 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 44,918 psi | 82% | 2598 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,785 psi | 76% | 2572 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,004 psi | 78% | 2530 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 38,058 psi | 69% | 2487 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 33,301 psi | 60% | 2388 fps | 95.5% |
| Lovex S070 | <<locked>> | 86% | 35,433 psi | 64% | 2461 fps | 95% |
| Norma 201 | <<locked>> | 80% | 41,843 psi | 76% | 2546 fps | 100% |
| Norma 202 | <<locked>> | 80% | 42,221 psi | 77% | 2552 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,029 psi | 69% | 2530 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 43,816 psi | 80% | 2657 fps | 95% |
| Norma MRP | <<locked>> | 98% | 38,305 psi | 70% | 2657 fps | 95.4% |
| Norma URP | <<locked>> | 82% | 29,385 psi | 53% | 2375 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 37,217 psi | 68% | 2536 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 34,940 psi | 63% | 2516 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 44,672 psi | 81% | 2608 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,106 psi | 80% | 2628 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,629 psi | 48% | 1512 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 36,840 psi | 67% | 2467 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,074 psi | 73% | 2631 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 32,808 psi | 60% | 2513 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 30,661 psi | 56% | 2441 fps | 95.9% |
| ReloadSwiss RS 70 | 48.6 gr | 86% | 33,214 psi | 60% | 2500 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 45,788 psi | 83% | 2575 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,842 psi | 72% | 2500 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 33,272 psi | 60% | 2428 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 86% | 38,957 psi | 71% | 2500 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 82% | 33,301 psi | 60% | 2388 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,785 psi | 76% | 2572 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,058 psi | 69% | 2487 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 35,433 psi | 64% | 2461 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,113 psi | 62% | 2477 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,960 psi | 78% | 2585 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,118 psi | 75% | 2562 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,526 psi | 79% | 2493 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,085 psi | 65% | 2375 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 36,637 psi | 66% | 2428 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 42,844 psi | 78% | 2493 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,583 psi | 77% | 2579 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 34,156 psi | 62% | 2434 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 24,743 psi | 45% | 2280 fps | 97% |
| Somchem S385 | <<locked>> | 96% | 38,421 psi | 70% | 2566 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 43,801 psi | 79% | 2484 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,349 psi | 71% | 2480 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,871 psi | 72% | 2490 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,460 psi | 59% | 2372 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 28,979 psi | 53% | 2329 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 44,788 psi | 81% | 2592 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 38,377 psi | 70% | 2487 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 30,255 psi | 55% | 2385 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 88% | 27,064 psi | 49% | 2372 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,935 psi | 53% | 2306 fps | 97.3% |
| Winchester 748 | <<locked>> | 80% | 44,164 psi | 80% | 2635 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 35,839 psi | 65% | 2530 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 92% | 25,483 psi | 46% | 2369 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,669 psi | 74% | 2572 fps | 99.8% |
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 | 181gr | RWS H-Mantel. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,835 fps; across all powders the maximum-charge window runs from 1,654 fps to 2,835 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 181.0 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for 7.5 x 55 Swiss with the .308 | 181gr | RWS H-Mantel 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.