Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 180gr | MAKER Expanding Subsonic 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-16 and Alliant Reloder-26.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 53,519 psi | 86% | 2680 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,868 psi | 88% | 2746 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,040 psi | 83% | 2782 fps | 99.3% |
| Accurate 4064 | <<locked>> | 84% | 53,983 psi | 87% | 2736 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,302 psi | 87% | 2835 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 54,186 psi | 87% | 2762 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,332 psi | 89% | 2874 fps | 98% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 52,924 psi | 85% | 2861 fps | 96.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 53,084 psi | 85% | 2881 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,868 psi | 88% | 2789 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,187 psi | 88% | 2808 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,114 psi | 88% | 2890 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 52,562 psi | 84% | 2858 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,636 psi | 88% | 2861 fps | 97.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,605 psi | 83% | 2858 fps | 97.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,878 psi | 78% | 2802 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,583 psi | 68% | 2720 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 56,014 psi | 90% | 2992 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,333 psi | 90% | 2828 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,326 psi | 76% | 2782 fps | 96.4% |
| Bofors RP3 | <<locked>> | 86% | 55,651 psi | 89% | 2805 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,605 psi | 83% | 2858 fps | 97.5% |
| Bofors RP7 | <<locked>> | 90% | 55,114 psi | 88% | 2785 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 86% | 55,941 psi | 90% | 2818 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 53,113 psi | 85% | 2831 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 88% | 53,011 psi | 85% | 2789 fps | 97.9% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 55,550 psi | 89% | 2848 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,303 psi | 89% | 2812 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 53,635 psi | 86% | 2802 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 52,837 psi | 85% | 2861 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,216 psi | 58% | 1729 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,578 psi | 88% | 2769 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 53,534 psi | 86% | 2746 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,231 psi | 90% | 2779 fps | 99.2% |
| IMR 4350 | <<locked>> | 94% | 55,985 psi | 90% | 2818 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 53,359 psi | 86% | 2762 fps | 98.8% |
| IMR 4831 | <<locked>> | 94% | 54,824 psi | 88% | 2828 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 53,127 psi | 85% | 2785 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,882 psi | 88% | 2802 fps | 96.2% |
| Lovex S060 | <<locked>> | 82% | 55,216 psi | 89% | 2733 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 53,911 psi | 86% | 2743 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 53,447 psi | 86% | 2759 fps | 99.6% |
| Lovex S070 | <<locked>> | 92% | 54,447 psi | 87% | 2799 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,192 psi | 69% | 2631 fps | 97.9% |
| Norma 201 | <<locked>> | 82% | 55,085 psi | 88% | 2749 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,753 psi | 89% | 2746 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,476 psi | 87% | 2795 fps | 100% |
| Norma 204 | <<locked>> | 92% | 52,982 psi | 85% | 2812 fps | 97.4% |
| Norma MRPᴾ | <<locked>> | 100% | 54,897 psi | 88% | 2946 fps | 99.2% |
| Norma URP | <<locked>> | 92% | 53,098 psi | 85% | 2818 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 55,114 psi | 88% | 2822 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 50,604 psi | 81% | 2844 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 94% | 55,332 psi | 89% | 2871 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,976 psi | 72% | 2720 fps | 96.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,970 psi | 59% | 1772 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,101 psi | 90% | 2805 fps | 99.5% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,927 psi | 90% | 2874 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,912 psi | 90% | 2907 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,172 psi | 87% | 2858 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 52,692 psi | 84% | 2881 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 41,510 psi | 67% | 2733 fps | 96.4% |
| Rottweil R 902 | <<locked>> | 84% | 55,883 psi | 90% | 2756 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,753 psi | 89% | 2799 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 53,722 psi | 86% | 2792 fps | 96.5% |
| Rottweil R 905 | <<locked>> | 98% | 53,882 psi | 86% | 2848 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 90% | 55,114 psi | 88% | 2785 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 90% | 53,447 psi | 86% | 2759 fps | 99.6% |
| Shooters World Precision | <<locked>> | 84% | 53,911 psi | 86% | 2743 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,447 psi | 87% | 2799 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 53,650 psi | 86% | 2805 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,766 psi | 88% | 2779 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,101 psi | 90% | 2687 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 53,461 psi | 86% | 2641 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 53,098 psi | 85% | 2713 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 53,388 psi | 86% | 2844 fps | 97.8% |
| Somchem S335 | <<locked>> | 82% | 55,593 psi | 89% | 2680 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,608 psi | 89% | 2792 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,463 psi | 89% | 2785 fps | 96% |
| Somchem S365 | <<locked>> | 96% | 55,724 psi | 89% | 2874 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,418 psi | 87% | 2825 fps | 98.6% |
| Vihtavuori N135 | <<locked>> | 84% | 56,130 psi | 90% | 2713 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,347 psi | 90% | 2730 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 53,534 psi | 86% | 2723 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,259 psi | 89% | 2815 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,299 psi | 81% | 2746 fps | 97.6% |
| Vihtavuori N540 | <<locked>> | 84% | 54,462 psi | 87% | 2726 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,346 psi | 87% | 2818 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,563 psi | 87% | 2874 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 55,303 psi | 89% | 2933 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,955 psi | 88% | 2785 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 53,113 psi | 85% | 2831 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,135 psi | 71% | 2854 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,998 psi | 88% | 2789 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,694 psi | 88% | 2818 fps | 97.8% |
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% | 50,314 psi | 81% | 2635 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,138 psi | 77% | 2635 fps | 97.3% |
| Accurate 3100 | <<locked>> | 88% | 34,519 psi | 55% | 2454 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 47,659 psi | 76% | 2641 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,100 psi | 58% | 2503 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 80% | 44,947 psi | 72% | 2612 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 92% | 45,643 psi | 73% | 2703 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 98% | 49,545 psi | 79% | 2802 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,443 psi | 79% | 2822 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,484 psi | 73% | 2638 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,559 psi | 78% | 2703 fps | 99.9% |
| Alliant Reloder-16 | 54.2 gr | 80% | 35,302 psi | 57% | 2510 fps | 97.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,900 psi | 64% | 2635 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 92% | 45,020 psi | 72% | 2694 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 42,351 psi | 68% | 2684 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,904 psi | 42% | 2270 fps | 95% |
| Alliant Reloder-25 | <<locked>> | 92% | 33,170 psi | 53% | 2490 fps | 95.1% |
| Alliant Reloder-26 | 62.8 gr | 84% | 31,401 psi | 50% | 2487 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,678 psi | 84% | 2772 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 44,585 psi | 71% | 2730 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 45,687 psi | 73% | 2648 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 42,351 psi | 68% | 2684 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 40,234 psi | 65% | 2516 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 46,079 psi | 74% | 2657 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 80% | 38,000 psi | 61% | 2546 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 82% | 43,787 psi | 70% | 2625 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 98% | 51,996 psi | 83% | 2792 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,924 psi | 53% | 2411 fps | 98.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,024 psi | 80% | 2749 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 39,769 psi | 64% | 2615 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,209 psi | 44% | 1549 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,227 psi | 82% | 2717 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,253 psi | 76% | 2644 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,588 psi | 80% | 2674 fps | 98.3% |
| IMR 4350 | <<locked>> | 84% | 40,799 psi | 65% | 2552 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,698 psi | 67% | 2549 fps | 96.4% |
| IMR 4831 | <<locked>> | 80% | 34,708 psi | 56% | 2457 fps | 97.3% |
| IMR 4895 | <<locked>> | 80% | 49,821 psi | 80% | 2733 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 51,503 psi | 83% | 2746 fps | 95.4% |
| Lovex S060 | <<locked>> | 80% | 52,069 psi | 83% | 2687 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,645 psi | 76% | 2648 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,320 psi | 63% | 2503 fps | 97.2% |
| Lovex S070 | <<locked>> | 80% | 37,536 psi | 60% | 2484 fps | 95.5% |
| Lovex S071 | <<locked>> | 94% | 35,766 psi | 57% | 2480 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 51,924 psi | 83% | 2703 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,518 psi | 84% | 2703 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,935 psi | 77% | 2694 fps | 100% |
| Norma 204 | <<locked>> | 86% | 43,265 psi | 69% | 2638 fps | 95% |
| Norma MRP | <<locked>> | 90% | 39,001 psi | 63% | 2644 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 36,013 psi | 58% | 2497 fps | 97.5% |
| Ramshot Big Game | <<locked>> | 80% | 48,037 psi | 77% | 2713 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 47,253 psi | 76% | 2782 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 34,867 psi | 56% | 2484 fps | 95.3% |
| Ramshot Magnum | <<locked>> | 98% | 41,989 psi | 67% | 2661 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,572 psi | 44% | 1585 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,079 psi | 74% | 2641 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,373 psi | 84% | 2818 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,380 psi | 68% | 2690 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,679 psi | 57% | 2516 fps | 97.2% |
| ReloadSwiss RS 70 | 59.3 gr | 80% | 34,896 psi | 56% | 2520 fps | 96.4% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 38,740 psi | 62% | 2664 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 49,414 psi | 79% | 2657 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,062 psi | 69% | 2595 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 47,210 psi | 76% | 2680 fps | 95% |
| Rottweil R 905 | <<locked>> | 92% | 44,034 psi | 71% | 2677 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 40,234 psi | 65% | 2516 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,320 psi | 63% | 2503 fps | 97.2% |
| Shooters World Precision | <<locked>> | 80% | 47,645 psi | 76% | 2648 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,536 psi | 60% | 2484 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,034 psi | 71% | 2648 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,445 psi | 82% | 2730 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,533 psi | 84% | 2635 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,338 psi | 71% | 2507 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,421 psi | 62% | 2448 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 43,627 psi | 70% | 2671 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 52,504 psi | 84% | 2638 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,453 psi | 70% | 2595 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 51,866 psi | 83% | 2730 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 32,460 psi | 52% | 2454 fps | 99.3% |
| Somchem S385 | <<locked>> | 88% | 39,320 psi | 63% | 2552 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 49,443 psi | 79% | 2621 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,821 psi | 80% | 2638 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,437 psi | 66% | 2530 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,376 psi | 60% | 2500 fps | 97.8% |
| Vihtavuori N165 | <<locked>> | 94% | 41,176 psi | 66% | 2582 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 48,051 psi | 77% | 2631 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,825 psi | 59% | 2500 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 80% | 28,282 psi | 45% | 2343 fps | 95.2% |
| Vihtavuori N560 | <<locked>> | 98% | 51,808 psi | 83% | 2874 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,521 psi | 59% | 2470 fps | 99.3% |
| Winchester 760 | <<locked>> | 80% | 38,159 psi | 61% | 2549 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 84% | 25,976 psi | 42% | 2349 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,401 psi | 82% | 2736 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 44,353 psi | 71% | 2648 fps | 95.5% |
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 | MAKER Expanding Subsonic. Alliant Reloder-26 delivers the highest muzzle velocity at 2,992 fps; across all powders the maximum-charge window runs from 1,729 fps to 2,992 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 1:13.5 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-16, Alliant Reloder-26 rank at the top here: for .300 H&H Mag. with the .308 | 180gr | MAKER Expanding Subsonic 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.