Load Specifications
Load data in caliber .243 Win. with .243 | 100gr | Norma ORYX 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, ReloadSwiss RS 60 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.
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>> | 84% | 53,737 psi | 89% | 2772 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 52,243 psi | 87% | 2772 fps | 97.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,588 psi | 81% | 2792 fps | 98.6% |
| Accurate 4064 | <<locked>> | 86% | 54,259 psi | 90% | 2825 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 50,836 psi | 84% | 2858 fps | 99.7% |
| Accurate High Countryᴾ | <<locked>> | 100% | 53,316 psi | 89% | 2989 fps | 96.4% |
| ADI AR 2206H | <<locked>> | 82% | 53,287 psi | 89% | 2848 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 51,474 psi | 86% | 2805 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 98% | 52,199 psi | 87% | 2890 fps | 96.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,330 psi | 89% | 2966 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 52,402 psi | 87% | 2890 fps | 97% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 52,402 psi | 87% | 2890 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 51,982 psi | 86% | 2828 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 52,054 psi | 86% | 2844 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 51,822 psi | 86% | 2917 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 90% | 52,765 psi | 88% | 2943 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 51,663 psi | 86% | 2881 fps | 96.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,617 psi | 81% | 2874 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,730 psi | 76% | 2822 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,147 psi | 67% | 2730 fps | 97.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,286 psi | 87% | 3002 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 53,359 psi | 89% | 2861 fps | 99.9% |
| Bofors RP3 | <<locked>> | 86% | 52,214 psi | 87% | 2835 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,617 psi | 81% | 2874 fps | 96.4% |
| Bofors RP7 | <<locked>> | 90% | 52,083 psi | 87% | 2812 fps | 97.8% |
| Hodgdon H380 | <<locked>> | 86% | 52,823 psi | 88% | 2848 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 53,229 psi | 88% | 2907 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 90% | 53,577 psi | 89% | 2871 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 82% | 53,867 psi | 89% | 2858 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 52,083 psi | 87% | 2844 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,041 psi | 90% | 2890 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 53,751 psi | 89% | 2943 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,085 psi | 60% | 1808 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 51,619 psi | 86% | 2808 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,186 psi | 90% | 2838 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,403 psi | 89% | 2812 fps | 98.4% |
| IMR 4350 | <<locked>> | 94% | 52,750 psi | 88% | 2838 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,983 psi | 90% | 2844 fps | 98.5% |
| IMR 4831 | <<locked>> | 94% | 51,488 psi | 86% | 2851 fps | 99.8% |
| IMR 4895 | <<locked>> | 84% | 53,403 psi | 89% | 2874 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 53,577 psi | 89% | 2822 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 52,649 psi | 87% | 2779 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,389 psi | 90% | 2835 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 53,969 psi | 90% | 2844 fps | 99.4% |
| Lovex S070 | <<locked>> | 92% | 51,677 psi | 86% | 2825 fps | 98.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,248 psi | 67% | 2648 fps | 96.8% |
| Norma 201 | <<locked>> | 82% | 52,359 psi | 87% | 2799 fps | 100% |
| Norma 202 | <<locked>> | 82% | 52,968 psi | 88% | 2795 fps | 100% |
| Norma 203B | <<locked>> | 84% | 51,358 psi | 85% | 2831 fps | 100% |
| Norma 204 | <<locked>> | 94% | 53,635 psi | 89% | 2890 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 51,619 psi | 86% | 2959 fps | 98.4% |
| Norma URP | <<locked>> | 94% | 53,258 psi | 88% | 2897 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 51,764 psi | 86% | 2851 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 52,359 psi | 87% | 2897 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,390 psi | 60% | 1844 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 52,997 psi | 88% | 2831 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 52,605 psi | 87% | 2910 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 52,344 psi | 87% | 2940 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 50,778 psi | 84% | 2881 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 53,359 psi | 89% | 2959 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 52,837 psi | 88% | 2795 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 52,460 psi | 87% | 2835 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 54,201 psi | 90% | 2864 fps | 96.1% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,041 psi | 90% | 2920 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 90% | 52,083 psi | 87% | 2812 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 92% | 53,969 psi | 90% | 2844 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 82% | 53,577 psi | 89% | 2822 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,389 psi | 90% | 2835 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 51,677 psi | 86% | 2825 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,969 psi | 90% | 2890 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 52,040 psi | 86% | 2822 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 53,069 psi | 88% | 2730 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,172 psi | 90% | 2733 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 53,708 psi | 89% | 2792 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,548 psi | 89% | 2913 fps | 97.4% |
| Somchem S335 | <<locked>> | 82% | 53,026 psi | 88% | 2730 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,302 psi | 90% | 2838 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 52,678 psi | 88% | 2831 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 52,098 psi | 87% | 2900 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 51,256 psi | 85% | 2841 fps | 97.8% |
| Vihtavuori N133 | <<locked>> | 82% | 53,519 psi | 89% | 2713 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 53,142 psi | 88% | 2762 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 53,417 psi | 89% | 2772 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 53,809 psi | 89% | 2805 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 52,083 psi | 87% | 2841 fps | 99.8% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,166 psi | 78% | 2756 fps | 96.5% |
| Vihtavuori N540 | <<locked>> | 84% | 51,866 psi | 86% | 2769 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 51,488 psi | 86% | 2848 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,111 psi | 85% | 2900 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 52,011 psi | 86% | 2812 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 53,621 psi | 89% | 2913 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,176 psi | 68% | 2858 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 51,779 psi | 86% | 2822 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,503 psi | 86% | 2831 fps | 96.8% |
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% | 47,384 psi | 79% | 2684 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,687 psi | 76% | 2664 fps | 96.1% |
| Accurate 3100 | <<locked>> | 92% | 36,811 psi | 61% | 2575 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 44,802 psi | 74% | 2684 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,431 psi | 56% | 2523 fps | 96.3% |
| Accurate High Country | <<locked>> | 98% | 49,574 psi | 82% | 2923 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 50,198 psi | 83% | 2799 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,656 psi | 71% | 2651 fps | 99% |
| ADI AR 2209 | <<locked>> | 94% | 45,759 psi | 76% | 2776 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,340 psi | 77% | 2848 fps | 99.6% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 45,992 psi | 76% | 2779 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 45,992 psi | 76% | 2779 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,612 psi | 71% | 2671 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,803 psi | 76% | 2740 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,156 psi | 55% | 2533 fps | 96.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,420 psi | 62% | 2664 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 94% | 45,411 psi | 75% | 2769 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 98% | 45,324 psi | 75% | 2812 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,383 psi | 45% | 2388 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,360 psi | 59% | 2612 fps | 95.5% |
| Alliant Reloder-26 | 40.3 gr | 88% | 33,736 psi | 56% | 2621 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,893 psi | 83% | 2805 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 42,917 psi | 71% | 2684 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 45,324 psi | 75% | 2812 fps | 95.5% |
| Bofors RP7 | <<locked>> | 84% | 43,091 psi | 72% | 2654 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 43,250 psi | 72% | 2687 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 84% | 40,625 psi | 67% | 2680 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 84% | 44,063 psi | 73% | 2703 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 50,734 psi | 84% | 2808 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,647 psi | 51% | 2434 fps | 97.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,123 psi | 78% | 2785 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 40,132 psi | 67% | 2690 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,832 psi | 45% | 1617 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,588 psi | 81% | 2759 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,773 psi | 74% | 2684 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,050 psi | 78% | 2703 fps | 97.3% |
| IMR 4350 | <<locked>> | 86% | 41,205 psi | 68% | 2635 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,508 psi | 66% | 2582 fps | 95.1% |
| IMR 4831 | <<locked>> | 80% | 32,430 psi | 54% | 2480 fps | 95.9% |
| IMR 4895 | <<locked>> | 80% | 46,949 psi | 78% | 2769 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 49,980 psi | 83% | 2769 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,603 psi | 82% | 2730 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 45,020 psi | 75% | 2687 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,130 psi | 62% | 2533 fps | 96% |
| Lovex S070 | <<locked>> | 84% | 40,016 psi | 66% | 2612 fps | 95.7% |
| Lovex S071 | <<locked>> | 96% | 35,331 psi | 59% | 2543 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 49,269 psi | 82% | 2749 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,443 psi | 82% | 2746 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,150 psi | 75% | 2730 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 46,630 psi | 77% | 2772 fps | 95.4% |
| Norma MRP | <<locked>> | 92% | 38,986 psi | 65% | 2713 fps | 95% |
| Norma URP | <<locked>> | 80% | 33,446 psi | 56% | 2520 fps | 96.1% |
| Ramshot Big Game | <<locked>> | 80% | 45,107 psi | 75% | 2743 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 37,420 psi | 62% | 2618 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,180 psi | 45% | 1654 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,714 psi | 73% | 2671 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,979 psi | 81% | 2851 fps | 99.8% |
| ReloadSwiss RS 60 | 35.8 gr | 80% | 39,769 psi | 66% | 2723 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,069 psi | 55% | 2533 fps | 95.7% |
| ReloadSwiss RS 70 | 37.2 gr | 82% | 35,027 psi | 58% | 2595 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 46,833 psi | 78% | 2700 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,190 psi | 67% | 2628 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 50,604 psi | 84% | 2808 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 94% | 44,266 psi | 74% | 2753 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 84% | 43,091 psi | 72% | 2654 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,130 psi | 62% | 2533 fps | 96% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,980 psi | 83% | 2769 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,020 psi | 75% | 2687 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 40,016 psi | 66% | 2612 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,292 psi | 69% | 2677 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,689 psi | 81% | 2766 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,922 psi | 83% | 2684 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,916 psi | 70% | 2556 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 38,653 psi | 64% | 2526 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 43,874 psi | 73% | 2746 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 50,009 psi | 83% | 2687 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,778 psi | 84% | 2782 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 40,959 psi | 68% | 2631 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 30,081 psi | 50% | 2474 fps | 98.3% |
| Somchem S385 | <<locked>> | 92% | 41,901 psi | 70% | 2677 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 50,357 psi | 84% | 2671 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,456 psi | 77% | 2667 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,963 psi | 78% | 2680 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,827 psi | 65% | 2562 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 34,896 psi | 58% | 2523 fps | 96.6% |
| Vihtavuori N165 | <<locked>> | 98% | 44,280 psi | 74% | 2707 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 45,324 psi | 75% | 2671 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,374 psi | 57% | 2523 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 84% | 29,791 psi | 49% | 2467 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,476 psi | 57% | 2497 fps | 98.6% |
| Winchester 760 | <<locked>> | 84% | 40,959 psi | 68% | 2687 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,557 psi | 46% | 2470 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,356 psi | 80% | 2769 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 47,848 psi | 79% | 2772 fps | 95.9% |
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 .243 Win. loaded with the .243 | 100gr | Norma ORYX. Alliant Reloder-26 delivers the highest muzzle velocity at 3,002 fps; across all powders the maximum-charge window runs from 1,808 fps to 3,002 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 (415 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 100.0 gr projectile in 0.243" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, 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, ReloadSwiss RS 60, Alliant Reloder-26 rank at the top here: for .243 Win. with the .243 | 100gr | Norma ORYX 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.