Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 180gr | Sellier & Bellot FMJ-BT 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 Alliant Reloder-16.
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% | 53,142 psi | 85% | 2674 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,592 psi | 88% | 2740 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,547 psi | 83% | 2776 fps | 99.2% |
| Accurate 4064 | <<locked>> | 84% | 53,635 psi | 86% | 2730 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,012 psi | 87% | 2828 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 56,188 psi | 90% | 2805 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 53,867 psi | 86% | 2759 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,853 psi | 88% | 2864 fps | 97.8% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 52,518 psi | 84% | 2851 fps | 96% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,420 psi | 90% | 2930 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,302 psi | 87% | 2779 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,607 psi | 88% | 2799 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,563 psi | 87% | 2881 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,898 psi | 90% | 2907 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,157 psi | 87% | 2854 fps | 97.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,155 psi | 82% | 2848 fps | 97.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,385 psi | 78% | 2792 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,221 psi | 68% | 2710 fps | 98.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,579 psi | 89% | 2986 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,086 psi | 90% | 2822 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,949 psi | 75% | 2772 fps | 96.3% |
| Bofors RP3 | <<locked>> | 86% | 55,303 psi | 89% | 2799 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,155 psi | 82% | 2848 fps | 97.4% |
| Bofors RP7 | <<locked>> | 90% | 54,636 psi | 88% | 2779 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 86% | 55,637 psi | 89% | 2812 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 56,144 psi | 90% | 2877 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 90% | 56,217 psi | 90% | 2841 fps | 98.3% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 55,114 psi | 88% | 2841 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,056 psi | 88% | 2808 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 53,301 psi | 85% | 2795 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 52,388 psi | 84% | 2854 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,332 psi | 58% | 1729 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,273 psi | 87% | 2762 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 53,214 psi | 85% | 2740 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,912 psi | 90% | 2772 fps | 99.1% |
| IMR 4350 | <<locked>> | 94% | 55,506 psi | 89% | 2812 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,275 psi | 90% | 2805 fps | 99.1% |
| IMR 4831 | <<locked>> | 94% | 54,317 psi | 87% | 2818 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,999 psi | 90% | 2825 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,447 psi | 87% | 2792 fps | 96% |
| Lovex S060 | <<locked>> | 82% | 54,897 psi | 88% | 2726 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 53,592 psi | 86% | 2736 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,391 psi | 90% | 2802 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 54,230 psi | 87% | 2792 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,743 psi | 69% | 2625 fps | 97.8% |
| Norma 201 | <<locked>> | 82% | 54,737 psi | 88% | 2743 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,405 psi | 89% | 2740 fps | 100% |
| Norma 203B | <<locked>> | 84% | 53,911 psi | 86% | 2785 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,376 psi | 90% | 2864 fps | 97.9% |
| Norma MRPᴾ | <<locked>> | 100% | 54,389 psi | 87% | 2936 fps | 99.1% |
| Norma URP | <<locked>> | 94% | 56,144 psi | 90% | 2864 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,549 psi | 87% | 2812 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 55,085 psi | 88% | 2867 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,643 psi | 72% | 2710 fps | 96.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,869 psi | 59% | 1768 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,622 psi | 89% | 2795 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,593 psi | 89% | 2867 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,564 psi | 89% | 2904 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 53,635 psi | 86% | 2848 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 56,101 psi | 90% | 2933 fps | 100% |
| Rottweil R 902 | <<locked>> | 84% | 55,550 psi | 89% | 2749 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,172 psi | 88% | 2789 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 53,258 psi | 85% | 2785 fps | 96.4% |
| Rottweil R 905 | <<locked>> | 98% | 53,359 psi | 86% | 2838 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 90% | 54,636 psi | 88% | 2779 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,391 psi | 90% | 2802 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 53,592 psi | 86% | 2736 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,230 psi | 87% | 2792 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 53,374 psi | 86% | 2799 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,462 psi | 87% | 2772 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,738 psi | 89% | 2680 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 53,156 psi | 85% | 2638 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,159 psi | 90% | 2756 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 52,881 psi | 85% | 2835 fps | 97.7% |
| Somchem S335 | <<locked>> | 82% | 55,274 psi | 89% | 2674 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,303 psi | 89% | 2789 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,056 psi | 88% | 2779 fps | 95.9% |
| Somchem S365 | <<locked>> | 96% | 55,405 psi | 89% | 2867 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 53,940 psi | 86% | 2815 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 82% | 56,246 psi | 90% | 2661 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,796 psi | 89% | 2707 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,043 psi | 90% | 2723 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 53,011 psi | 85% | 2713 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,998 psi | 88% | 2808 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,864 psi | 80% | 2736 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 84% | 54,201 psi | 87% | 2720 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 53,853 psi | 86% | 2812 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,085 psi | 87% | 2867 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 54,853 psi | 88% | 2923 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,505 psi | 87% | 2779 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,420 psi | 90% | 2881 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,526 psi | 70% | 2841 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,462 psi | 87% | 2779 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,259 psi | 87% | 2812 fps | 97.7% |
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% | 49,966 psi | 80% | 2631 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,863 psi | 77% | 2628 fps | 97.2% |
| Accurate 3100 | <<locked>> | 88% | 34,287 psi | 55% | 2444 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 47,311 psi | 76% | 2635 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,781 psi | 57% | 2493 fps | 97.5% |
| ADI AR 2206H | <<locked>> | 80% | 52,721 psi | 85% | 2753 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,628 psi | 72% | 2605 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 92% | 45,208 psi | 72% | 2697 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 98% | 49,139 psi | 79% | 2792 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,124 psi | 79% | 2812 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,150 psi | 72% | 2631 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,225 psi | 77% | 2697 fps | 99.9% |
| Alliant Reloder-16 | 53.8 gr | 80% | 35,012 psi | 56% | 2500 fps | 97.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,581 psi | 63% | 2628 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 92% | 44,817 psi | 72% | 2690 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,773 psi | 72% | 2733 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,296 psi | 44% | 2313 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,998 psi | 56% | 2539 fps | 96% |
| Alliant Reloder-26 | 62.4 gr | 84% | 31,183 psi | 50% | 2480 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,417 psi | 84% | 2766 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 44,150 psi | 71% | 2720 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 45,353 psi | 73% | 2644 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 44,773 psi | 72% | 2733 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 39,943 psi | 64% | 2510 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 45,788 psi | 73% | 2651 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 80% | 37,681 psi | 60% | 2536 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 82% | 43,511 psi | 70% | 2618 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 98% | 51,561 psi | 83% | 2782 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,619 psi | 52% | 2405 fps | 98.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,719 psi | 80% | 2740 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 39,363 psi | 63% | 2605 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,064 psi | 43% | 1542 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,894 psi | 82% | 2710 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,934 psi | 75% | 2638 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,313 psi | 79% | 2667 fps | 98.2% |
| IMR 4350 | <<locked>> | 84% | 40,553 psi | 65% | 2546 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,423 psi | 66% | 2543 fps | 96.3% |
| IMR 4831 | <<locked>> | 80% | 34,447 psi | 55% | 2448 fps | 97.2% |
| IMR 4895 | <<locked>> | 80% | 49,487 psi | 79% | 2726 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 51,358 psi | 82% | 2743 fps | 95.3% |
| Lovex S060 | <<locked>> | 80% | 51,793 psi | 83% | 2680 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,326 psi | 76% | 2638 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,044 psi | 63% | 2497 fps | 97.1% |
| Lovex S070 | <<locked>> | 80% | 37,246 psi | 60% | 2474 fps | 95.4% |
| Lovex S071 | <<locked>> | 94% | 35,331 psi | 57% | 2470 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 51,576 psi | 83% | 2697 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,156 psi | 84% | 2697 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,601 psi | 76% | 2687 fps | 100% |
| Norma 204 | <<locked>> | 88% | 45,963 psi | 74% | 2690 fps | 95.7% |
| Norma MRP | <<locked>> | 90% | 38,624 psi | 62% | 2635 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 35,708 psi | 57% | 2490 fps | 97.4% |
| Ramshot Big Game | <<locked>> | 80% | 47,761 psi | 77% | 2707 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 80% | 34,621 psi | 56% | 2474 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 98% | 41,655 psi | 67% | 2651 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,615 psi | 44% | 1581 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,818 psi | 73% | 2631 fps | 98.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,011 psi | 83% | 2812 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,076 psi | 67% | 2684 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,360 psi | 57% | 2507 fps | 97.1% |
| ReloadSwiss RS 70 | 58.9 gr | 80% | 34,650 psi | 56% | 2513 fps | 96.2% |
| Rottweil R 902 | <<locked>> | 80% | 49,110 psi | 79% | 2651 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,728 psi | 69% | 2589 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 94% | 49,893 psi | 80% | 2726 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 92% | 43,787 psi | 70% | 2671 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 39,943 psi | 64% | 2510 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,044 psi | 63% | 2497 fps | 97.1% |
| Shooters World Precision | <<locked>> | 80% | 47,326 psi | 76% | 2638 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,246 psi | 60% | 2474 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,743 psi | 70% | 2641 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,140 psi | 82% | 2723 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,431 psi | 84% | 2631 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,237 psi | 71% | 2507 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,159 psi | 61% | 2441 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 43,366 psi | 70% | 2664 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 52,156 psi | 84% | 2631 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,120 psi | 69% | 2589 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 51,474 psi | 83% | 2723 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 32,169 psi | 52% | 2448 fps | 99.2% |
| Somchem S385 | <<locked>> | 88% | 39,073 psi | 63% | 2546 fps | 95% |
| Vihtavuori N133 | <<locked>> | 80% | 52,953 psi | 85% | 2618 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,298 psi | 79% | 2618 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,487 psi | 79% | 2631 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,133 psi | 66% | 2523 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,086 psi | 59% | 2493 fps | 97.7% |
| Vihtavuori N165 | <<locked>> | 94% | 40,785 psi | 65% | 2572 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 47,761 psi | 77% | 2625 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,564 psi | 59% | 2493 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 80% | 27,978 psi | 45% | 2336 fps | 95% |
| Vihtavuori N560 | <<locked>> | 98% | 51,329 psi | 82% | 2864 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,303 psi | 58% | 2464 fps | 99.3% |
| Winchester 760 | <<locked>> | 80% | 37,869 psi | 61% | 2543 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 84% | 25,686 psi | 41% | 2336 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,111 psi | 82% | 2730 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,918 psi | 70% | 2638 fps | 95.3% |
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 | Sellier & Bellot FMJ-BT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,986 fps; across all powders the maximum-charge window runs from 1,729 fps to 2,986 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 1:13.0 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, Alliant Reloder-16 rank at the top here: for .300 H&H Mag. with the .308 | 180gr | Sellier & Bellot FMJ-BT 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.