Load Specifications
Load data in caliber .375 H&H Mag. with .375 | 250gr | Frontier PH HPBT bullet and 93 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 52 and Hodgdon CFE223.
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 2015 | <<locked>> | 90% | 53,708 psi | 86% | 2598 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 53,911 psi | 86% | 2677 fps | 98.5% |
| Accurate 2230 | <<locked>> | 82% | 54,810 psi | 88% | 2690 fps | 98.9% |
| Accurate 2460 | <<locked>> | 88% | 55,550 psi | 89% | 2664 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 53,751 psi | 86% | 2651 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 53,229 psi | 85% | 2671 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 53,229 psi | 85% | 2684 fps | 100% |
| Accurate LT-30 | <<locked>> | 84% | 53,940 psi | 86% | 2549 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 54,404 psi | 87% | 2569 fps | 100% |
| ADI AR 2206H | <<locked>> | 94% | 55,985 psi | 90% | 2723 fps | 99.3% |
| ADI AR 2207 | <<locked>> | 82% | 55,593 psi | 89% | 2569 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 53,461 psi | 86% | 2664 fps | 98.5% |
| ADI AR 2219 | <<locked>> | 84% | 54,302 psi | 87% | 2664 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 55,492 psi | 89% | 2684 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 92% | 54,766 psi | 88% | 2667 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 53,330 psi | 86% | 2730 fps | 99.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 55,521 psi | 89% | 2822 fps | 98.8% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 55,854 psi | 90% | 2733 fps | 99.7% |
| Alliant Reloder-10x | <<locked>> | 86% | 53,722 psi | 86% | 2605 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 53,287 psi | 85% | 2703 fps | 98.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 43,018 psi | 69% | 2579 fps | 95.9% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 49,530 psi | 79% | 2733 fps | 99% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 56,304 psi | 90% | 2589 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 55,796 psi | 89% | 2736 fps | 98.6% |
| Bofors RP3ᴾ | <<locked>> | 100% | 56,173 psi | 90% | 2746 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 90% | 54,418 psi | 87% | 2625 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 92% | 53,954 psi | 87% | 2710 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 90% | 55,869 psi | 90% | 2799 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 88% | 56,275 psi | 90% | 2687 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 53,809 psi | 86% | 2667 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 54,346 psi | 87% | 2707 fps | 97.8% |
| Hodgdon H4198 | <<locked>> | 82% | 55,927 psi | 90% | 2592 fps | 100% |
| Hodgdon H4895 | <<locked>> | 94% | 56,420 psi | 90% | 2733 fps | 99.6% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 39,305 psi | 63% | 2477 fps | 96.7% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 54,694 psi | 88% | 2756 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,301 psi | 55% | 1594 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 54,607 psi | 88% | 2690 fps | 99.4% |
| IMR 3031 | <<locked>> | 94% | 55,303 psi | 89% | 2720 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 56,289 psi | 90% | 2697 fps | 99% |
| IMR 4198 | <<locked>> | 86% | 54,288 psi | 87% | 2569 fps | 100% |
| IMR 4895 | <<locked>> | 96% | 54,549 psi | 87% | 2733 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 92% | 55,492 psi | 89% | 2684 fps | 99.8% |
| Lovex D073.4 | <<locked>> | 82% | 55,622 psi | 89% | 2674 fps | 100% |
| Lovex D073.5 | <<locked>> | 88% | 55,695 psi | 89% | 2674 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 54,853 psi | 88% | 2703 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 53,084 psi | 85% | 2608 fps | 99% |
| Lovex S062 | <<locked>> | 98% | 55,666 psi | 89% | 2697 fps | 99.8% |
| Norma 200 | <<locked>> | 82% | 53,548 psi | 86% | 2579 fps | 100% |
| Norma 201 | <<locked>> | 94% | 54,578 psi | 88% | 2671 fps | 99.8% |
| Norma 202 | <<locked>> | 94% | 54,969 psi | 88% | 2680 fps | 100% |
| Norma 203B | <<locked>> | 98% | 55,869 psi | 90% | 2743 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 98% | 56,434 psi | 90% | 2769 fps | 99.3% |
| Ramshot TAC | <<locked>> | 92% | 56,275 psi | 90% | 2697 fps | 97.4% |
| Ramshot Wild Boar | <<locked>> | 92% | 54,969 psi | 88% | 2713 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 88% | 53,403 psi | 86% | 2635 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,606 psi | 55% | 1634 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 55,317 psi | 89% | 2674 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 55,143 psi | 88% | 2687 fps | 96.2% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 52,866 psi | 85% | 2762 fps | 98.7% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 52,997 psi | 85% | 2799 fps | 100% |
| Rottweil R 901 | <<locked>> | 92% | 55,680 psi | 89% | 2661 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 55,042 psi | 88% | 2667 fps | 99.8% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 52,040 psi | 83% | 2680 fps | 99.3% |
| Shooters World AR Plus | <<locked>> | 82% | 55,622 psi | 89% | 2674 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 94% | 54,853 psi | 88% | 2703 fps | 100% |
| Shooters World Precision | <<locked>> | 98% | 55,666 psi | 89% | 2697 fps | 99.8% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 55,506 psi | 89% | 2644 fps | 99.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 54,839 psi | 88% | 2323 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 54,433 psi | 87% | 2667 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 54,230 psi | 87% | 2746 fps | 99.1% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 54,549 psi | 87% | 2625 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 53,983 psi | 87% | 2667 fps | 97.5% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 54,288 psi | 87% | 2694 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 53,751 psi | 86% | 2582 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 56,405 psi | 90% | 2618 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 53,156 psi | 85% | 2671 fps | 99.8% |
| Somchem S335 | <<locked>> | 94% | 55,869 psi | 90% | 2621 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 53,316 psi | 85% | 2664 fps | 98.9% |
| Somchem S355ᴾ | <<locked>> | 100% | 53,127 psi | 85% | 2687 fps | 99.3% |
| Somchem S365ᴾ | <<locked>> | 100% | 38,043 psi | 61% | 2520 fps | 97.9% |
| Vihtavuori N120 | <<locked>> | 82% | 55,448 psi | 89% | 2520 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 53,693 psi | 86% | 2556 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 53,548 psi | 86% | 2569 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 53,809 psi | 86% | 2641 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 55,463 psi | 89% | 2657 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 51,126 psi | 82% | 2625 fps | 99.7% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 45,194 psi | 72% | 2575 fps | 96.2% |
| Vihtavuori N530 | <<locked>> | 92% | 56,130 psi | 90% | 2684 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 96% | 53,664 psi | 86% | 2657 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 44,106 psi | 71% | 2579 fps | 95.8% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 46,601 psi | 75% | 2569 fps | 98.4% |
| Winchester 748 | <<locked>> | 92% | 55,071 psi | 88% | 2730 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 53,882 psi | 86% | 2703 fps | 99.4% |
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 2015 | <<locked>> | 80% | 39,465 psi | 63% | 2382 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 50,618 psi | 81% | 2628 fps | 98% |
| Accurate 2230 | <<locked>> | 80% | 51,213 psi | 82% | 2638 fps | 98.4% |
| Accurate 2460 | <<locked>> | 80% | 42,685 psi | 68% | 2470 fps | 99.7% |
| Accurate 2495 | <<locked>> | 80% | 31,821 psi | 51% | 2287 fps | 99.8% |
| Accurate 2520 | <<locked>> | 80% | 37,811 psi | 61% | 2421 fps | 98.8% |
| Accurate 4064 | <<locked>> | 80% | 30,110 psi | 48% | 2267 fps | 97.8% |
| Accurate LT-30 | <<locked>> | 80% | 47,761 psi | 77% | 2461 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 48,138 psi | 77% | 2477 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 80% | 36,172 psi | 58% | 2375 fps | 95.4% |
| ADI AR 2207 | <<locked>> | 80% | 52,228 psi | 84% | 2526 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 39,479 psi | 63% | 2425 fps | 95.5% |
| ADI AR 2219 | <<locked>> | 80% | 47,427 psi | 76% | 2566 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,116 psi | 61% | 2392 fps | 97.3% |
| Alliant AR-Comp | <<locked>> | 80% | 36,695 psi | 59% | 2405 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 43,874 psi | 70% | 2575 fps | 98.1% |
| Alliant Power Pro 2000-MR | 66.2 gr | 86% | 39,726 psi | 64% | 2533 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 33,736 psi | 54% | 2346 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 44,730 psi | 72% | 2477 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 38,928 psi | 62% | 2454 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 98% | 40,553 psi | 65% | 2530 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 90% | 35,694 psi | 57% | 2454 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 46,688 psi | 75% | 2457 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 39,943 psi | 64% | 2470 fps | 95.2% |
| Bofors RP3 | <<locked>> | 84% | 32,924 psi | 53% | 2343 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,292 psi | 65% | 2395 fps | 98.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,027 psi | 58% | 2402 fps | 97.4% |
| Hodgdon CFE223 | 63 gr | 80% | 39,479 psi | 63% | 2516 fps | 95.7% |
| Hodgdon H322 | <<locked>> | 80% | 43,308 psi | 69% | 2497 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 43,859 psi | 70% | 2516 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 92% | 44,643 psi | 72% | 2552 fps | 95.8% |
| Hodgdon H4198 | <<locked>> | 80% | 52,576 psi | 84% | 2546 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 36,390 psi | 58% | 2385 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 34,766 psi | 56% | 2379 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,489 psi | 52% | 2343 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,556 psi | 41% | 1424 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,085 psi | 56% | 2343 fps | 95.5% |
| IMR 3031 | <<locked>> | 80% | 35,012 psi | 56% | 2395 fps | 99.8% |
| IMR 4064 | <<locked>> | 86% | 38,957 psi | 62% | 2411 fps | 95.7% |
| IMR 4198 | <<locked>> | 80% | 45,542 psi | 73% | 2448 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 35,027 psi | 56% | 2382 fps | 95.1% |
| IMR 8208 XBR | <<locked>> | 80% | 38,116 psi | 61% | 2392 fps | 97.3% |
| Lovex D073.4 | <<locked>> | 80% | 51,735 psi | 83% | 2621 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 42,438 psi | 68% | 2470 fps | 99% |
| Lovex D073.6 | <<locked>> | 80% | 34,142 psi | 55% | 2352 fps | 98% |
| Lovex S060 | <<locked>> | 80% | 37,115 psi | 60% | 2329 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 31,894 psi | 51% | 2270 fps | 95.4% |
| Norma 200 | <<locked>> | 80% | 50,386 psi | 81% | 2536 fps | 100% |
| Norma 201 | <<locked>> | 80% | 35,433 psi | 57% | 2336 fps | 96.7% |
| Norma 202 | <<locked>> | 80% | 35,331 psi | 57% | 2352 fps | 98.8% |
| Norma 203B | <<locked>> | 84% | 35,940 psi | 58% | 2395 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 86% | 37,942 psi | 61% | 2454 fps | 95.6% |
| Ramshot TAC | <<locked>> | 86% | 46,296 psi | 74% | 2539 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 36,854 psi | 59% | 2398 fps | 95.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 41,394 psi | 66% | 2434 fps | 96.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,585 psi | 41% | 1457 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 42,801 psi | 69% | 2477 fps | 99.3% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 51,706 psi | 83% | 2635 fps | 95.5% |
| ReloadSwiss RS 52 | 62.7 gr | 84% | 37,782 psi | 61% | 2493 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 29,414 psi | 47% | 2297 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 39,160 psi | 63% | 2392 fps | 99.2% |
| Rottweil R 902 | <<locked>> | 80% | 33,750 psi | 54% | 2293 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 86% | 32,982 psi | 53% | 2336 fps | 95.1% |
| Shooters World AR Plus | <<locked>> | 80% | 51,735 psi | 83% | 2621 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,142 psi | 55% | 2352 fps | 98% |
| Shooters World Precision | <<locked>> | 80% | 31,894 psi | 51% | 2270 fps | 95.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 45,324 psi | 73% | 2493 fps | 98.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 52,040 psi | 83% | 2287 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 47,688 psi | 76% | 2572 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 36,840 psi | 59% | 2438 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 45,310 psi | 73% | 2490 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 43,859 psi | 70% | 2507 fps | 95.4% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 37,115 psi | 60% | 2395 fps | 95.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,144 psi | 60% | 2313 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,327 psi | 49% | 2185 fps | 98.4% |
| Somchem S321 | <<locked>> | 80% | 40,698 psi | 65% | 2464 fps | 98.2% |
| Somchem S335 | <<locked>> | 80% | 36,637 psi | 59% | 2320 fps | 99.5% |
| Somchem S341 | <<locked>> | 80% | 35,563 psi | 57% | 2352 fps | 95% |
| Somchem S355 | <<locked>> | 86% | 34,360 psi | 55% | 2349 fps | 95.3% |
| Somchem S365 | <<locked>> | 94% | 31,546 psi | 51% | 2365 fps | 95.4% |
| Vihtavuori N120 | <<locked>> | 80% | 52,069 psi | 83% | 2477 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 42,177 psi | 68% | 2392 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 37,173 psi | 60% | 2320 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,372 psi | 52% | 2293 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 80% | 33,504 psi | 54% | 2297 fps | 98.6% |
| Vihtavuori N150 | <<locked>> | 84% | 30,530 psi | 49% | 2244 fps | 95.5% |
| Vihtavuori N160 | <<locked>> | 98% | 42,438 psi | 68% | 2526 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 37,913 psi | 61% | 2385 fps | 97.4% |
| Vihtavuori N540 | <<locked>> | 80% | 32,053 psi | 51% | 2277 fps | 97.8% |
| Vihtavuori N550 | <<locked>> | 98% | 41,336 psi | 66% | 2526 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 35,911 psi | 58% | 2362 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 36,709 psi | 59% | 2421 fps | 97.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 33,707 psi | 54% | 2339 fps | 95.2% |
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 93 powders for .375 H&H Mag. loaded with the .375 | 250gr | Frontier PH HPBT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,822 fps; across all powders the maximum-charge window runs from 1,594 fps to 2,822 fps. Alliant Reloder- TS 15.5 gives the best case fill at 100 %, and 93 of the 93 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder- TS 15.5, Alliant Reloder-16, Alliant Reloder-17 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 Power Pro 2000-MR, ReloadSwiss RS 52, Hodgdon CFE223 rank at the top here: for .375 H&H Mag. with the .375 | 250gr | Frontier PH HPBT 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.