Load Specifications
Load data in caliber 6 mm Creedmoor with .243 | 116gr | Sierra Tipped MatchKing 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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 53,882 psi | 87% | 2644 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,042 psi | 89% | 2710 fps | 98.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,286 psi | 84% | 2753 fps | 99.6% |
| Accurate 4064 | <<locked>> | 84% | 54,172 psi | 87% | 2697 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,926 psi | 89% | 2805 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 54,462 psi | 88% | 2890 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 86% | 54,563 psi | 88% | 2730 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,927 psi | 90% | 2848 fps | 98.5% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,432 psi | 86% | 2838 fps | 96.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 53,388 psi | 86% | 2844 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,361 psi | 89% | 2753 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,448 psi | 89% | 2772 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,608 psi | 90% | 2858 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,055 psi | 86% | 2828 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,056 psi | 89% | 2835 fps | 98.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,156 psi | 84% | 2835 fps | 98.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,168 psi | 79% | 2769 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,917 psi | 69% | 2697 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 98% | 52,533 psi | 85% | 2904 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,906 psi | 77% | 2759 fps | 97.2% |
| Bofors RP3 | <<locked>> | 86% | 55,869 psi | 90% | 2766 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,156 psi | 84% | 2835 fps | 98.2% |
| Bofors RP7 | <<locked>> | 90% | 55,274 psi | 89% | 2753 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 84% | 52,982 psi | 85% | 2733 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 53,374 psi | 86% | 2799 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 88% | 53,432 psi | 86% | 2759 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 98% | 53,548 psi | 86% | 2782 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 52,272 psi | 84% | 2762 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,666 psi | 90% | 2776 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,027 psi | 87% | 2769 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,163 psi | 68% | 2723 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 90% | 53,127 psi | 86% | 2831 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,492 psi | 59% | 1699 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,085 psi | 89% | 2733 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,099 psi | 87% | 2713 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 53,156 psi | 86% | 2694 fps | 99.1% |
| IMR 4350 | <<locked>> | 92% | 53,011 psi | 86% | 2740 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 53,911 psi | 87% | 2733 fps | 99.2% |
| IMR 4831 | <<locked>> | 94% | 55,434 psi | 89% | 2795 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 53,563 psi | 86% | 2753 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,434 psi | 89% | 2776 fps | 96.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 50,763 psi | 82% | 2805 fps | 96.4% |
| Lovex S060 | <<locked>> | 82% | 55,434 psi | 89% | 2694 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,404 psi | 88% | 2707 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 53,693 psi | 87% | 2726 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 55,114 psi | 89% | 2769 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,787 psi | 71% | 2612 fps | 98.5% |
| Norma 201 | <<locked>> | 82% | 55,419 psi | 89% | 2713 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,737 psi | 88% | 2759 fps | 100% |
| Norma 204 | <<locked>> | 92% | 53,229 psi | 86% | 2782 fps | 97.9% |
| Norma MRPᴾ | <<locked>> | 100% | 55,535 psi | 90% | 2920 fps | 99.5% |
| Norma URP | <<locked>> | 92% | 53,766 psi | 87% | 2789 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,361 psi | 89% | 2785 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,039 psi | 82% | 2822 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 94% | 55,840 psi | 90% | 2841 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,585 psi | 74% | 2703 fps | 97.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,898 psi | 60% | 1736 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 52,736 psi | 85% | 2717 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 52,562 psi | 85% | 2818 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,476 psi | 88% | 2825 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,098 psi | 86% | 2851 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 41,727 psi | 67% | 2713 fps | 97.3% |
| Rottweil R 902 | <<locked>> | 84% | 55,999 psi | 90% | 2713 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 52,808 psi | 85% | 2717 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,085 psi | 87% | 2762 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 98% | 54,331 psi | 88% | 2822 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 90% | 55,274 psi | 89% | 2753 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 53,693 psi | 87% | 2726 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 54,404 psi | 88% | 2707 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,114 psi | 89% | 2769 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 53,940 psi | 87% | 2769 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,230 psi | 89% | 2746 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 53,882 psi | 87% | 2605 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 53,316 psi | 86% | 2680 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 53,853 psi | 87% | 2815 fps | 98.4% |
| Somchem S335 | <<locked>> | 82% | 55,941 psi | 90% | 2641 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,101 psi | 90% | 2759 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,811 psi | 90% | 2756 fps | 96.7% |
| Somchem S365 | <<locked>> | 94% | 52,663 psi | 85% | 2789 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,737 psi | 88% | 2792 fps | 99% |
| Vihtavuori N135 | <<locked>> | 82% | 53,127 psi | 86% | 2631 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 53,359 psi | 86% | 2648 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 53,882 psi | 87% | 2687 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,825 psi | 90% | 2782 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,473 psi | 81% | 2717 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 84% | 55,013 psi | 89% | 2690 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,737 psi | 88% | 2785 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,085 psi | 89% | 2844 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 55,898 psi | 90% | 2910 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,230 psi | 89% | 2749 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 53,780 psi | 87% | 2805 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,411 psi | 72% | 2828 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,158 psi | 89% | 2749 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,071 psi | 89% | 2789 fps | 98.3% |
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% | 50,647 psi | 82% | 2598 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,486 psi | 78% | 2605 fps | 97.9% |
| Accurate 3100 | <<locked>> | 86% | 32,793 psi | 53% | 2385 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 47,993 psi | 77% | 2605 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,303 psi | 59% | 2477 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 98% | 50,734 psi | 82% | 2828 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 45,223 psi | 73% | 2579 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 42,975 psi | 69% | 2621 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 96% | 46,833 psi | 76% | 2720 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,792 psi | 80% | 2789 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,832 psi | 74% | 2608 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,747 psi | 79% | 2671 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,766 psi | 58% | 2493 fps | 98.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,306 psi | 65% | 2612 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 42,525 psi | 69% | 2615 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 40,045 psi | 65% | 2608 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,092 psi | 42% | 2254 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 90% | 31,343 psi | 51% | 2418 fps | 95.1% |
| Alliant Reloder-26 | 37.1 gr | 82% | 29,718 psi | 48% | 2418 fps | 95.3% |
| Bofors RP15 | <<locked>> | 96% | 42,003 psi | 68% | 2648 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 46,021 psi | 74% | 2618 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 40,045 psi | 65% | 2608 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 40,567 psi | 65% | 2493 fps | 96.2% |
| Hodgdon H380 | <<locked>> | 80% | 46,572 psi | 75% | 2628 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 80% | 38,319 psi | 62% | 2523 fps | 96.2% |
| Hodgdon H4350 | <<locked>> | 80% | 41,379 psi | 67% | 2543 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 96% | 50,227 psi | 81% | 2730 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 96% | 49,095 psi | 79% | 2710 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,040 psi | 53% | 2385 fps | 98.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,444 psi | 81% | 2717 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 39,363 psi | 63% | 2657 fps | 95.1% |
| Hodgdon Superformance | 37.3 gr | 80% | 37,347 psi | 60% | 2533 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,079 psi | 44% | 1516 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,488 psi | 83% | 2680 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,514 psi | 77% | 2612 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,111 psi | 81% | 2644 fps | 98.7% |
| IMR 4350 | <<locked>> | 82% | 38,740 psi | 62% | 2477 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,916 psi | 68% | 2523 fps | 97.1% |
| IMR 4831 | <<locked>> | 80% | 35,041 psi | 57% | 2434 fps | 98% |
| IMR 4895 | <<locked>> | 80% | 50,024 psi | 81% | 2697 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 48,834 psi | 79% | 2671 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 98% | 47,659 psi | 77% | 2749 fps | 95.6% |
| Lovex S060 | <<locked>> | 80% | 52,272 psi | 84% | 2648 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,848 psi | 77% | 2612 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,581 psi | 64% | 2477 fps | 97.8% |
| Lovex S070 | <<locked>> | 80% | 37,884 psi | 61% | 2461 fps | 96.3% |
| Lovex S071 | <<locked>> | 92% | 33,866 psi | 55% | 2411 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 52,185 psi | 84% | 2667 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,153 psi | 78% | 2657 fps | 100% |
| Norma 204 | <<locked>> | 86% | 43,526 psi | 70% | 2612 fps | 95.8% |
| Norma MRP | <<locked>> | 88% | 36,680 psi | 59% | 2562 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 36,390 psi | 59% | 2477 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 80% | 48,341 psi | 78% | 2680 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 44,469 psi | 72% | 2700 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 35,085 psi | 57% | 2457 fps | 96.1% |
| Ramshot Magnum | <<locked>> | 96% | 39,407 psi | 64% | 2579 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,818 psi | 45% | 1558 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,485 psi | 75% | 2612 fps | 98.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,830 psi | 69% | 2664 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,969 psi | 58% | 2493 fps | 97.9% |
| ReloadSwiss RS 70 | 35.8 gr | 80% | 35,099 psi | 57% | 2500 fps | 97.2% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 38,928 psi | 63% | 2644 fps | 96.2% |
| Rottweil R 902 | <<locked>> | 80% | 49,676 psi | 80% | 2621 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,453 psi | 70% | 2569 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 47,500 psi | 77% | 2654 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 90% | 41,495 psi | 67% | 2598 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 40,567 psi | 65% | 2493 fps | 96.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,581 psi | 64% | 2477 fps | 97.8% |
| Shooters World Precision | <<locked>> | 80% | 47,848 psi | 77% | 2612 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,884 psi | 61% | 2461 fps | 96.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,295 psi | 71% | 2615 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,692 psi | 83% | 2694 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,744 psi | 72% | 2477 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,696 psi | 62% | 2421 fps | 96.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 41,104 psi | 66% | 2592 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 52,765 psi | 85% | 2602 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,700 psi | 70% | 2566 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 48,863 psi | 79% | 2648 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 32,619 psi | 53% | 2431 fps | 99.6% |
| Somchem S385 | <<locked>> | 86% | 36,999 psi | 60% | 2474 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 49,937 psi | 81% | 2585 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,241 psi | 81% | 2602 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,843 psi | 67% | 2500 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,579 psi | 61% | 2470 fps | 98.4% |
| Vihtavuori N165 | <<locked>> | 92% | 39,030 psi | 63% | 2510 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 48,515 psi | 78% | 2598 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,246 psi | 60% | 2477 fps | 98.1% |
| Vihtavuori N555 | <<locked>> | 80% | 28,631 psi | 46% | 2329 fps | 96.2% |
| Vihtavuori N560 | <<locked>> | 96% | 48,660 psi | 78% | 2785 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,840 psi | 59% | 2448 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 38,319 psi | 62% | 2523 fps | 96.2% |
| Winchester StaBALL HD | <<locked>> | 82% | 24,540 psi | 40% | 2277 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,982 psi | 84% | 2703 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 41,858 psi | 68% | 2569 fps | 95.4% |
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 100 powders for 6 mm Creedmoor loaded with the .243 | 116gr | Sierra Tipped MatchKing. Norma MRP delivers the highest muzzle velocity at 2,920 fps; across all powders the maximum-charge window runs from 1,699 fps to 2,920 fps. Accurate 3100 gives the best case fill at 100 %, and 100 of the 100 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (427 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 116.0 gr projectile in 0.243" calls for a 1:7.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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 6 mm Creedmoor with the .243 | 116gr | Sierra Tipped MatchKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, ADI AR 2225, Baschieri & Pellagri 109 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.