Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 180gr | Swift A-Frame 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, Alliant Reloder-26 and Hodgdon Superformance.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 54,012 psi | 87% | 2687 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,201 psi | 89% | 2753 fps | 98.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,591 psi | 84% | 2792 fps | 99.4% |
| Accurate 4064 | <<locked>> | 84% | 54,462 psi | 87% | 2743 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,969 psi | 88% | 2848 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 54,563 psi | 87% | 2772 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,883 psi | 90% | 2884 fps | 98.1% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,650 psi | 86% | 2877 fps | 96.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 53,505 psi | 86% | 2890 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 55,985 psi | 90% | 2884 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,303 psi | 89% | 2795 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,593 psi | 89% | 2818 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,738 psi | 89% | 2900 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,185 psi | 85% | 2871 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,187 psi | 88% | 2874 fps | 98.1% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,388 psi | 84% | 2874 fps | 97.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,443 psi | 79% | 2812 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,018 psi | 69% | 2730 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 98% | 52,547 psi | 84% | 2940 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,834 psi | 77% | 2792 fps | 96.6% |
| Bofors RP3 | <<locked>> | 86% | 56,043 psi | 90% | 2812 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,388 psi | 84% | 2874 fps | 97.8% |
| Bofors RP7 | <<locked>> | 90% | 55,492 psi | 89% | 2795 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 84% | 52,837 psi | 85% | 2776 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 90% | 53,461 psi | 86% | 2838 fps | 99% |
| Hodgdon H4350 | <<locked>> | 88% | 53,374 psi | 86% | 2799 fps | 98% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 56,304 psi | 90% | 2864 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,956 psi | 90% | 2825 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,027 psi | 87% | 2808 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 53,388 psi | 86% | 2874 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,448 psi | 58% | 1739 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,013 psi | 88% | 2776 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 53,969 psi | 87% | 2756 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 53,156 psi | 85% | 2736 fps | 98.9% |
| IMR 4350 | <<locked>> | 94% | 56,260 psi | 90% | 2828 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 88% | 53,679 psi | 86% | 2769 fps | 98.9% |
| IMR 4831 | <<locked>> | 94% | 55,448 psi | 89% | 2838 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 53,577 psi | 86% | 2792 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,390 psi | 89% | 2812 fps | 96.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 50,966 psi | 82% | 2844 fps | 95.9% |
| Lovex S060 | <<locked>> | 82% | 55,637 psi | 89% | 2743 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,346 psi | 87% | 2753 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 53,809 psi | 86% | 2769 fps | 99.6% |
| Lovex S070 | <<locked>> | 92% | 55,056 psi | 88% | 2812 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,772 psi | 70% | 2648 fps | 98.1% |
| Norma 201 | <<locked>> | 82% | 55,521 psi | 89% | 2759 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,159 psi | 90% | 2756 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,882 psi | 88% | 2805 fps | 100% |
| Norma 204 | <<locked>> | 92% | 53,505 psi | 86% | 2825 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 55,405 psi | 89% | 2956 fps | 99.3% |
| Norma URP | <<locked>> | 92% | 53,751 psi | 86% | 2831 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,492 psi | 89% | 2828 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,068 psi | 82% | 2858 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 94% | 55,912 psi | 90% | 2884 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,629 psi | 73% | 2736 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,999 psi | 59% | 1778 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 52,852 psi | 85% | 2756 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 52,663 psi | 84% | 2864 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,810 psi | 88% | 2867 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,229 psi | 85% | 2894 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 41,887 psi | 67% | 2743 fps | 96.6% |
| Rottweil R 902 | <<locked>> | 84% | 56,101 psi | 90% | 2759 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,159 psi | 90% | 2808 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,041 psi | 87% | 2799 fps | 96.7% |
| Rottweil R 905 | <<locked>> | 98% | 54,404 psi | 87% | 2861 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 90% | 55,492 psi | 89% | 2795 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 90% | 53,809 psi | 86% | 2769 fps | 99.6% |
| Shooters World Precision | <<locked>> | 84% | 54,346 psi | 87% | 2753 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,056 psi | 88% | 2812 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,056 psi | 87% | 2815 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,158 psi | 88% | 2789 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,318 psi | 90% | 2690 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 53,882 psi | 86% | 2651 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 53,417 psi | 86% | 2723 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 53,911 psi | 86% | 2854 fps | 98% |
| Somchem S335 | <<locked>> | 82% | 56,028 psi | 90% | 2690 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,043 psi | 90% | 2802 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,927 psi | 90% | 2799 fps | 96.2% |
| Somchem S365 | <<locked>> | 96% | 56,347 psi | 90% | 2881 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,955 psi | 88% | 2835 fps | 98.7% |
| Vihtavuori N135 | <<locked>> | 82% | 53,069 psi | 85% | 2674 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 53,287 psi | 85% | 2690 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 53,954 psi | 87% | 2730 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,869 psi | 90% | 2825 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,792 psi | 81% | 2756 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 84% | 54,882 psi | 88% | 2733 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,955 psi | 88% | 2831 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,201 psi | 89% | 2887 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 55,782 psi | 89% | 2943 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,477 psi | 89% | 2795 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 53,722 psi | 86% | 2844 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,585 psi | 71% | 2864 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,419 psi | 89% | 2795 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,216 psi | 89% | 2831 fps | 97.9% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 50,575 psi | 81% | 2641 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,486 psi | 78% | 2644 fps | 97.4% |
| Accurate 3100 | <<locked>> | 88% | 35,041 psi | 56% | 2467 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 47,906 psi | 77% | 2648 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,477 psi | 58% | 2513 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 80% | 45,353 psi | 73% | 2621 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 43,047 psi | 69% | 2657 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 98% | 50,024 psi | 80% | 2815 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,850 psi | 80% | 2828 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 43,250 psi | 69% | 2657 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,687 psi | 73% | 2644 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,008 psi | 79% | 2713 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,665 psi | 57% | 2520 fps | 97.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,263 psi | 65% | 2644 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 42,743 psi | 69% | 2651 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 42,815 psi | 69% | 2697 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,049 psi | 42% | 2277 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 92% | 33,417 psi | 54% | 2500 fps | 95.3% |
| Alliant Reloder-26 | 63.4 gr | 84% | 31,821 psi | 51% | 2503 fps | 95.6% |
| Bofors RP15 | <<locked>> | 96% | 42,221 psi | 68% | 2684 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 46,122 psi | 74% | 2657 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 42,815 psi | 69% | 2697 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 40,582 psi | 65% | 2526 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 46,485 psi | 75% | 2667 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 38,363 psi | 62% | 2556 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 80% | 41,437 psi | 66% | 2579 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 98% | 52,489 psi | 84% | 2802 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,112 psi | 53% | 2418 fps | 98.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,691 psi | 81% | 2759 fps | 100% |
| Hodgdon Superformance | 63.8 gr | 82% | 40,059 psi | 64% | 2625 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,122 psi | 43% | 1549 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,663 psi | 83% | 2726 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,703 psi | 76% | 2654 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,951 psi | 80% | 2684 fps | 98.4% |
| IMR 4350 | <<locked>> | 82% | 38,624 psi | 62% | 2507 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,032 psi | 67% | 2559 fps | 96.6% |
| IMR 4831 | <<locked>> | 80% | 35,099 psi | 56% | 2467 fps | 97.5% |
| IMR 4895 | <<locked>> | 80% | 50,270 psi | 81% | 2743 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,011 psi | 83% | 2759 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 98% | 47,732 psi | 77% | 2785 fps | 95% |
| Lovex S060 | <<locked>> | 80% | 52,272 psi | 84% | 2690 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,863 psi | 77% | 2651 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,508 psi | 63% | 2510 fps | 97.3% |
| Lovex S070 | <<locked>> | 80% | 37,739 psi | 61% | 2487 fps | 95.6% |
| Lovex S071 | <<locked>> | 92% | 33,866 psi | 54% | 2438 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 52,127 psi | 84% | 2710 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,736 psi | 85% | 2710 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,370 psi | 78% | 2700 fps | 100% |
| Norma 204 | <<locked>> | 86% | 43,569 psi | 70% | 2648 fps | 95.2% |
| Norma MRP | <<locked>> | 90% | 39,291 psi | 63% | 2651 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 36,201 psi | 58% | 2503 fps | 97.6% |
| Ramshot Big Game | <<locked>> | 80% | 48,443 psi | 78% | 2720 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 47,703 psi | 76% | 2795 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 35,201 psi | 56% | 2490 fps | 95.4% |
| Ramshot Magnum | <<locked>> | 98% | 42,380 psi | 68% | 2671 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,673 psi | 44% | 1588 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,441 psi | 74% | 2651 fps | 98.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,772 psi | 69% | 2700 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,042 psi | 58% | 2526 fps | 97.4% |
| ReloadSwiss RS 70 | 59.8 gr | 80% | 35,172 psi | 56% | 2530 fps | 96.6% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,073 psi | 63% | 2674 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 49,661 psi | 80% | 2664 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,265 psi | 69% | 2602 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 47,732 psi | 77% | 2694 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 90% | 41,698 psi | 67% | 2635 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 40,582 psi | 65% | 2526 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,508 psi | 63% | 2510 fps | 97.3% |
| Shooters World Precision | <<locked>> | 80% | 47,863 psi | 77% | 2651 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,739 psi | 61% | 2487 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,440 psi | 71% | 2657 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,837 psi | 83% | 2736 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,011 psi | 85% | 2644 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,744 psi | 72% | 2516 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,769 psi | 62% | 2457 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 44,179 psi | 71% | 2684 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 52,692 psi | 84% | 2644 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,656 psi | 70% | 2602 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 52,301 psi | 84% | 2740 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 32,692 psi | 52% | 2464 fps | 99.3% |
| Somchem S385 | <<locked>> | 88% | 39,624 psi | 64% | 2559 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 49,937 psi | 80% | 2631 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,024 psi | 80% | 2641 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,640 psi | 67% | 2536 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,768 psi | 61% | 2510 fps | 98% |
| Vihtavuori N165 | <<locked>> | 94% | 41,698 psi | 67% | 2595 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 48,443 psi | 78% | 2638 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,188 psi | 60% | 2510 fps | 97.6% |
| Vihtavuori N555 | <<locked>> | 80% | 28,631 psi | 46% | 2356 fps | 95.5% |
| Vihtavuori N560 | <<locked>> | 98% | 52,286 psi | 84% | 2884 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,825 psi | 59% | 2477 fps | 99.4% |
| Winchester 760 | <<locked>> | 80% | 38,537 psi | 62% | 2559 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,194 psi | 42% | 2359 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,793 psi | 83% | 2746 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 44,802 psi | 72% | 2657 fps | 95.7% |
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 94 powders for .300 H&H Mag. loaded with the .308 | 180gr | Swift A-Frame. Norma MRP delivers the highest muzzle velocity at 2,956 fps; across all powders the maximum-charge window runs from 1,739 fps to 2,956 fps. Accurate 3100 gives the best case fill at 100 %, and 94 of the 94 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 58–90 %, 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 2213, Alliant Reloder-22 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, Alliant Reloder-26, Hodgdon Superformance rank at the top here: for .300 H&H Mag. with the .308 | 180gr | Swift A-Frame they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.