Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 160gr | Winchester FailSafe bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, ReloadSwiss RS 70 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.
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>> | 82% | 56,304 psi | 87% | 2671 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 57,348 psi | 88% | 2749 fps | 99.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,245 psi | 85% | 2792 fps | 99.8% |
| Accurate 4064 | <<locked>> | 84% | 56,753 psi | 87% | 2730 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 57,609 psi | 89% | 2841 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 57,406 psi | 88% | 2933 fps | 97% |
| ADI AR 2208 | <<locked>> | 86% | 56,666 psi | 87% | 2762 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 58,407 psi | 90% | 2884 fps | 98.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,985 psi | 86% | 2884 fps | 97.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,043 psi | 86% | 2881 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 57,348 psi | 88% | 2782 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 57,754 psi | 89% | 2805 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 58,073 psi | 89% | 2890 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 55,869 psi | 86% | 2864 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 57,566 psi | 89% | 2871 fps | 98.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,998 psi | 85% | 2877 fps | 98.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,880 psi | 80% | 2805 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,150 psi | 69% | 2740 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 55,941 psi | 86% | 2946 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,444 psi | 78% | 2802 fps | 97.8% |
| Bofors RP3 | <<locked>> | 86% | 58,334 psi | 90% | 2799 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,998 psi | 85% | 2877 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 57,653 psi | 89% | 2789 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 86% | 58,755 psi | 90% | 2818 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 55,898 psi | 86% | 2838 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 88% | 55,738 psi | 86% | 2799 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 98% | 56,275 psi | 87% | 2828 fps | 97% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,042 psi | 85% | 2808 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 58,436 psi | 90% | 2812 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,507 psi | 87% | 2802 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,295 psi | 68% | 2776 fps | 97.2% |
| Hodgdon Superformance | <<locked>> | 90% | 56,144 psi | 86% | 2877 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,608 psi | 56% | 1713 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,956 psi | 88% | 2762 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,086 psi | 86% | 2743 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 58,711 psi | 90% | 2782 fps | 99.7% |
| IMR 4350 | <<locked>> | 94% | 58,595 psi | 90% | 2825 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,593 psi | 86% | 2762 fps | 99.4% |
| IMR 4831 | <<locked>> | 94% | 57,740 psi | 89% | 2828 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,695 psi | 86% | 2782 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 57,653 psi | 89% | 2812 fps | 97.4% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,417 psi | 82% | 2854 fps | 97.2% |
| Lovex S060 | <<locked>> | 82% | 57,392 psi | 88% | 2723 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 56,289 psi | 87% | 2736 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,854 psi | 86% | 2759 fps | 99.9% |
| Lovex S070 | <<locked>> | 92% | 57,246 psi | 88% | 2805 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,180 psi | 71% | 2651 fps | 99% |
| Norma 201 | <<locked>> | 82% | 57,624 psi | 89% | 2746 fps | 100% |
| Norma 202 | <<locked>> | 82% | 58,465 psi | 90% | 2743 fps | 100% |
| Norma 203B | <<locked>> | 84% | 57,043 psi | 88% | 2792 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,811 psi | 86% | 2822 fps | 98.5% |
| Norma MRPᴾ | <<locked>> | 100% | 58,668 psi | 90% | 2963 fps | 99.8% |
| Norma URP | <<locked>> | 92% | 56,101 psi | 86% | 2822 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 57,928 psi | 89% | 2818 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,650 psi | 83% | 2867 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 94% | 58,668 psi | 90% | 2881 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,037 psi | 74% | 2749 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,333 psi | 57% | 1755 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 58,740 psi | 90% | 2808 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,230 psi | 85% | 2854 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 57,522 psi | 88% | 2864 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 55,695 psi | 86% | 2890 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,034 psi | 68% | 2766 fps | 98.2% |
| Rottweil R 902 | <<locked>> | 84% | 58,102 psi | 89% | 2743 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 58,494 psi | 90% | 2795 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,362 psi | 87% | 2799 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 98% | 57,058 psi | 88% | 2861 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 90% | 57,653 psi | 89% | 2789 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,854 psi | 86% | 2759 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 56,289 psi | 87% | 2736 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,246 psi | 88% | 2805 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,492 psi | 87% | 2805 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,406 psi | 88% | 2776 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 58,349 psi | 90% | 2674 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,912 psi | 86% | 2635 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,477 psi | 85% | 2713 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,565 psi | 87% | 2858 fps | 98.9% |
| Somchem S335 | <<locked>> | 82% | 57,986 psi | 89% | 2671 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 58,233 psi | 90% | 2789 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 58,204 psi | 90% | 2795 fps | 97.3% |
| Somchem S365 | <<locked>> | 94% | 55,521 psi | 85% | 2825 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 57,696 psi | 89% | 2838 fps | 99.4% |
| Vihtavuori N135 | <<locked>> | 84% | 58,682 psi | 90% | 2700 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,288 psi | 85% | 2674 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,072 psi | 86% | 2717 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 58,247 psi | 90% | 2818 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,113 psi | 82% | 2756 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 84% | 57,101 psi | 88% | 2717 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 57,276 psi | 88% | 2822 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 58,349 psi | 90% | 2884 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 54,853 psi | 84% | 2890 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 57,827 psi | 89% | 2782 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,217 psi | 86% | 2844 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,978 psi | 72% | 2871 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 57,711 psi | 89% | 2785 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 57,870 psi | 89% | 2831 fps | 98.8% |
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% | 52,779 psi | 81% | 2625 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,430 psi | 78% | 2641 fps | 98.3% |
| Accurate 3100 | <<locked>> | 84% | 32,271 psi | 50% | 2365 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 50,038 psi | 77% | 2635 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,377 psi | 59% | 2516 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 96% | 49,980 psi | 77% | 2815 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 46,963 psi | 72% | 2612 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 42,177 psi | 65% | 2605 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 94% | 45,759 psi | 70% | 2703 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,170 psi | 80% | 2825 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,732 psi | 73% | 2638 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,981 psi | 78% | 2703 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,231 psi | 57% | 2523 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,148 psi | 65% | 2644 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 41,887 psi | 64% | 2598 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 39,465 psi | 61% | 2592 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,340 psi | 42% | 2290 fps | 96.8% |
| Alliant Reloder-25 | <<locked>> | 88% | 30,922 psi | 48% | 2402 fps | 95% |
| Alliant Reloder-26 | 52 gr | 80% | 29,153 psi | 45% | 2395 fps | 95.1% |
| Bofors RP15 | <<locked>> | 94% | 41,553 psi | 64% | 2635 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 48,095 psi | 74% | 2648 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 39,465 psi | 61% | 2592 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 42,279 psi | 65% | 2530 fps | 96.9% |
| Hodgdon H380 | <<locked>> | 80% | 48,356 psi | 74% | 2661 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 40,118 psi | 62% | 2559 fps | 96.9% |
| Hodgdon H4350 | <<locked>> | 80% | 43,120 psi | 66% | 2579 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 94% | 49,066 psi | 75% | 2713 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 94% | 47,993 psi | 74% | 2694 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,809 psi | 54% | 2421 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,721 psi | 81% | 2746 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 38,856 psi | 60% | 2648 fps | 95.1% |
| Hodgdon Superformance | 53.6 gr | 80% | 39,044 psi | 60% | 2569 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,325 psi | 42% | 1529 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,476 psi | 82% | 2713 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,385 psi | 76% | 2644 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,619 psi | 79% | 2674 fps | 99.1% |
| IMR 4350 | <<locked>> | 80% | 37,855 psi | 58% | 2457 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,627 psi | 67% | 2556 fps | 97.6% |
| IMR 4831 | <<locked>> | 80% | 36,695 psi | 56% | 2467 fps | 98.5% |
| IMR 4895 | <<locked>> | 80% | 52,257 psi | 80% | 2730 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 47,819 psi | 74% | 2654 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 96% | 46,804 psi | 72% | 2736 fps | 95.6% |
| Lovex S060 | <<locked>> | 80% | 53,954 psi | 83% | 2677 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,661 psi | 76% | 2638 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,162 psi | 63% | 2510 fps | 98.3% |
| Lovex S070 | <<locked>> | 80% | 39,320 psi | 60% | 2490 fps | 96.8% |
| Lovex S071 | <<locked>> | 90% | 33,359 psi | 51% | 2395 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 54,099 psi | 83% | 2697 fps | 100% |
| Norma 202 | <<locked>> | 80% | 54,897 psi | 84% | 2694 fps | 100% |
| Norma 203B | <<locked>> | 80% | 50,343 psi | 77% | 2694 fps | 100% |
| Norma 204 | <<locked>> | 84% | 42,598 psi | 66% | 2592 fps | 95.6% |
| Norma MRP | <<locked>> | 86% | 35,998 psi | 55% | 2543 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 37,956 psi | 58% | 2507 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 80% | 50,575 psi | 78% | 2713 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 46,543 psi | 72% | 2743 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 36,753 psi | 57% | 2493 fps | 96.8% |
| Ramshot Magnum | <<locked>> | 94% | 38,754 psi | 60% | 2566 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,818 psi | 43% | 1565 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,312 psi | 74% | 2644 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,802 psi | 69% | 2694 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,043 psi | 59% | 2533 fps | 98.5% |
| ReloadSwiss RS 70 | 51.5 gr | 80% | 36,811 psi | 57% | 2536 fps | 97.9% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,305 psi | 59% | 2631 fps | 96.2% |
| Rottweil R 902 | <<locked>> | 80% | 51,517 psi | 79% | 2651 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,208 psi | 70% | 2595 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 46,586 psi | 72% | 2638 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 88% | 40,988 psi | 63% | 2582 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 42,279 psi | 65% | 2530 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,162 psi | 63% | 2510 fps | 98.3% |
| Shooters World Precision | <<locked>> | 80% | 49,661 psi | 76% | 2638 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,320 psi | 60% | 2490 fps | 96.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,296 psi | 71% | 2648 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,693 psi | 83% | 2723 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 54,708 psi | 84% | 2628 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,354 psi | 71% | 2500 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,350 psi | 62% | 2457 fps | 97% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 40,611 psi | 62% | 2579 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 54,563 psi | 84% | 2628 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 45,484 psi | 70% | 2595 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 47,645 psi | 73% | 2628 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 34,519 psi | 53% | 2470 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 36,477 psi | 56% | 2457 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 51,822 psi | 80% | 2612 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,953 psi | 80% | 2628 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,381 psi | 67% | 2526 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,523 psi | 61% | 2510 fps | 98.9% |
| Vihtavuori N165 | <<locked>> | 90% | 38,334 psi | 59% | 2493 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 50,241 psi | 77% | 2625 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,841 psi | 60% | 2510 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 80% | 30,182 psi | 46% | 2362 fps | 96.9% |
| Vihtavuori N560 | <<locked>> | 94% | 47,935 psi | 74% | 2772 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,406 psi | 59% | 2477 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 40,364 psi | 62% | 2562 fps | 97% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,120 psi | 37% | 2257 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 53,969 psi | 83% | 2733 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 40,857 psi | 63% | 2549 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 96 powders for .280 Ackley Improved loaded with the .284 | 160gr | Winchester FailSafe. Norma MRP delivers the highest muzzle velocity at 2,963 fps; across all powders the maximum-charge window runs from 1,713 fps to 2,963 fps. Accurate 3100 gives the best case fill at 100 %, and 96 of the 96 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.284" calls for a 1:11.5 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. Alliant Reloder-26, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .280 Ackley Improved with the .284 | 160gr | Winchester FailSafe 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.