Load Specifications
Load data in caliber .280 Rem. with .284 | 160gr | Hornady CX bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance and Alliant Reloder-17.
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 2015 | <<locked>> | 82% | 52,576 psi | 90% | 2536 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 51,024 psi | 87% | 2562 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 53,026 psi | 90% | 2628 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 50,546 psi | 86% | 2566 fps | 97% |
| Accurate 3100ᴾ | <<locked>> | 100% | 41,872 psi | 71% | 2523 fps | 97% |
| Accurate 4064 | <<locked>> | 88% | 51,329 psi | 87% | 2608 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 50,908 psi | 87% | 2690 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 84% | 51,866 psi | 88% | 2638 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 53,011 psi | 90% | 2641 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 49,966 psi | 85% | 2671 fps | 96% |
| ADI Benchmark 8208 | <<locked>> | 82% | 50,937 psi | 87% | 2592 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 51,895 psi | 88% | 2566 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 51,314 psi | 87% | 2749 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 53,011 psi | 90% | 2664 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 50,111 psi | 85% | 2631 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 98% | 52,808 psi | 90% | 2749 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 50,169 psi | 85% | 2730 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 48,950 psi | 83% | 2664 fps | 96% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,045 psi | 68% | 2552 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,701 psi | 76% | 2710 fps | 99% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 51,503 psi | 88% | 2651 fps | 99.7% |
| Bofors RP3 | <<locked>> | 88% | 49,850 psi | 85% | 2625 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 50,372 psi | 86% | 2602 fps | 97.3% |
| Hodgdon Benchmark | <<locked>> | 82% | 52,663 psi | 90% | 2575 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 50,053 psi | 85% | 2618 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 50,937 psi | 87% | 2641 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 94% | 50,720 psi | 86% | 2690 fps | 98% |
| Hodgdon H4350 | <<locked>> | 92% | 51,285 psi | 87% | 2654 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 84% | 52,373 psi | 89% | 2648 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,301 psi | 89% | 2677 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 52,054 psi | 89% | 2684 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 50,937 psi | 87% | 2723 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,534 psi | 60% | 1621 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 50,459 psi | 86% | 2605 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 52,533 psi | 89% | 2628 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 52,417 psi | 89% | 2625 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 52,562 psi | 89% | 2608 fps | 98.1% |
| IMR 4350 | <<locked>> | 96% | 50,749 psi | 86% | 2631 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 92% | 52,315 psi | 89% | 2635 fps | 98% |
| IMR 4831 | <<locked>> | 98% | 51,750 psi | 88% | 2684 fps | 99.8% |
| IMR 4895 | <<locked>> | 86% | 51,401 psi | 88% | 2661 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 50,937 psi | 87% | 2592 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 51,445 psi | 88% | 2615 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 51,663 psi | 88% | 2572 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 52,170 psi | 89% | 2618 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 51,474 psi | 88% | 2625 fps | 99% |
| Lovex S070 | <<locked>> | 96% | 52,286 psi | 89% | 2657 fps | 98.3% |
| Norma 201 | <<locked>> | 84% | 50,589 psi | 86% | 2585 fps | 100% |
| Norma 202 | <<locked>> | 84% | 51,140 psi | 87% | 2585 fps | 100% |
| Norma 203B | <<locked>> | 88% | 52,605 psi | 90% | 2667 fps | 100% |
| Norma 204 | <<locked>> | 96% | 50,908 psi | 87% | 2671 fps | 96.1% |
| Norma MRPᴾ | <<locked>> | 100% | 44,599 psi | 76% | 2667 fps | 96.5% |
| Norma URP | <<locked>> | 96% | 50,415 psi | 86% | 2680 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 86% | 49,588 psi | 84% | 2641 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 98% | 52,852 psi | 90% | 2733 fps | 99% |
| Ramshot TAC | <<locked>> | 82% | 50,879 psi | 87% | 2608 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 82% | 50,546 psi | 86% | 2625 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,926 psi | 61% | 1657 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 51,227 psi | 87% | 2625 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 50,459 psi | 86% | 2694 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 49,806 psi | 85% | 2723 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 50,720 psi | 86% | 2710 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 50,517 psi | 86% | 2740 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 82% | 51,605 psi | 88% | 2569 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 51,227 psi | 87% | 2585 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 49,748 psi | 85% | 2618 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 47,514 psi | 81% | 2641 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 92% | 50,372 psi | 86% | 2602 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 94% | 51,474 psi | 88% | 2625 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 84% | 51,445 psi | 88% | 2615 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 52,170 psi | 89% | 2618 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 52,286 psi | 89% | 2657 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 51,677 psi | 88% | 2680 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 52,881 psi | 90% | 2641 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 50,401 psi | 86% | 2612 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 52,069 psi | 89% | 2530 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 52,562 psi | 89% | 2533 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 51,416 psi | 88% | 2579 fps | 97.9% |
| Somchem S335 | <<locked>> | 84% | 51,532 psi | 88% | 2526 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 52,489 psi | 89% | 2628 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 50,575 psi | 86% | 2621 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,967 psi | 88% | 2733 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,080 psi | 82% | 2625 fps | 96.8% |
| Vihtavuori N133 | <<locked>> | 84% | 52,460 psi | 89% | 2516 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 51,097 psi | 87% | 2556 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 51,924 psi | 88% | 2572 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 51,561 psi | 88% | 2598 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 52,750 psi | 90% | 2677 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 82% | 51,358 psi | 87% | 2592 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 50,038 psi | 85% | 2569 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 51,895 psi | 88% | 2684 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,063 psi | 75% | 2625 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 52,997 psi | 90% | 2657 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 51,111 psi | 87% | 2635 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 50,720 psi | 86% | 2690 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,665 psi | 61% | 2566 fps | 99.5% |
| Winchester StaBALL Match | <<locked>> | 84% | 50,082 psi | 85% | 2618 fps | 100% |
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 2015 | <<locked>> | 80% | 49,588 psi | 84% | 2497 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,916 psi | 71% | 2428 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,356 psi | 84% | 2575 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 44,237 psi | 75% | 2461 fps | 95.6% |
| Accurate 3100 | <<locked>> | 96% | 36,114 psi | 61% | 2411 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 39,711 psi | 68% | 2428 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 31,111 psi | 53% | 2313 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 45,643 psi | 78% | 2539 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 38,754 psi | 66% | 2398 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 98% | 46,789 psi | 80% | 2618 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,790 psi | 81% | 2543 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 48,443 psi | 82% | 2523 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,582 psi | 71% | 2575 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,580 psi | 66% | 2421 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,278 psi | 70% | 2480 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 31,879 psi | 54% | 2336 fps | 95.7% |
| Alliant Reloder-17 | 42.1 gr | 80% | 33,199 psi | 57% | 2395 fps | 98% |
| Alliant Reloder-19 | <<locked>> | 98% | 45,934 psi | 78% | 2608 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 88% | 27,412 psi | 47% | 2244 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 92% | 33,576 psi | 57% | 2464 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,121 psi | 77% | 2549 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 38,159 psi | 65% | 2425 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 41,553 psi | 71% | 2448 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,501 psi | 84% | 2530 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,644 psi | 79% | 2566 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,928 psi | 66% | 2428 fps | 97.4% |
| Hodgdon H414 | <<locked>> | 86% | 38,783 psi | 66% | 2477 fps | 95% |
| Hodgdon H4350 | <<locked>> | 88% | 45,165 psi | 77% | 2549 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 46,064 psi | 78% | 2549 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,195 psi | 46% | 2185 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,235 psi | 72% | 2526 fps | 99.8% |
| Hodgdon Superformance | 48.9 gr | 88% | 40,857 psi | 70% | 2539 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,368 psi | 45% | 1444 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,353 psi | 76% | 2507 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 46,151 psi | 79% | 2539 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,683 psi | 69% | 2428 fps | 98.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,236 psi | 74% | 2454 fps | 96.2% |
| IMR 4350 | <<locked>> | 90% | 41,945 psi | 71% | 2477 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 84% | 40,727 psi | 69% | 2431 fps | 95.4% |
| IMR 4831 | <<locked>> | 82% | 30,487 psi | 52% | 2280 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 42,293 psi | 72% | 2507 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 47,790 psi | 81% | 2543 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,788 psi | 76% | 2516 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,585 psi | 78% | 2477 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 40,553 psi | 69% | 2431 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 35,375 psi | 60% | 2329 fps | 95.3% |
| Lovex S070 | <<locked>> | 86% | 38,247 psi | 65% | 2411 fps | 95% |
| Norma 201 | <<locked>> | 80% | 44,744 psi | 76% | 2493 fps | 100% |
| Norma 202 | <<locked>> | 80% | 45,179 psi | 77% | 2497 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,640 psi | 69% | 2467 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 47,674 psi | 81% | 2618 fps | 95.3% |
| Norma MRP | <<locked>> | 98% | 41,800 psi | 71% | 2612 fps | 95.7% |
| Norma URP | <<locked>> | 82% | 31,778 psi | 54% | 2323 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 40,292 psi | 69% | 2484 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 37,898 psi | 65% | 2464 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 47,834 psi | 81% | 2559 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,456 psi | 81% | 2575 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,803 psi | 46% | 1480 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,291 psi | 67% | 2411 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,758 psi | 74% | 2579 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,433 psi | 60% | 2461 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 33,199 psi | 57% | 2382 fps | 95.8% |
| ReloadSwiss RS 70 | 45.9 gr | 86% | 35,665 psi | 61% | 2448 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 48,443 psi | 82% | 2520 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,467 psi | 72% | 2448 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 35,824 psi | 61% | 2372 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 98% | 44,411 psi | 76% | 2589 fps | 95% |
| Rottweil R 907 | <<locked>> | 86% | 41,553 psi | 71% | 2448 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 82% | 35,375 psi | 60% | 2329 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,788 psi | 76% | 2516 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,553 psi | 69% | 2431 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 86% | 38,247 psi | 65% | 2411 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,840 psi | 63% | 2418 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,890 psi | 78% | 2530 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,121 psi | 75% | 2510 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,948 psi | 78% | 2441 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,232 psi | 65% | 2316 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 39,552 psi | 67% | 2379 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 45,745 psi | 78% | 2444 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,905 psi | 78% | 2530 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 36,738 psi | 63% | 2379 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 26,469 psi | 45% | 2218 fps | 96.7% |
| Somchem S385 | <<locked>> | 96% | 42,119 psi | 72% | 2520 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 46,369 psi | 79% | 2431 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,018 psi | 72% | 2421 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,786 psi | 73% | 2438 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,882 psi | 59% | 2316 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 30,966 psi | 53% | 2270 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 48,109 psi | 82% | 2543 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,118 psi | 70% | 2428 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 32,547 psi | 55% | 2323 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 88% | 29,399 psi | 50% | 2313 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,879 psi | 53% | 2251 fps | 97.3% |
| Winchester 748 | <<locked>> | 80% | 47,877 psi | 82% | 2585 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 38,783 psi | 66% | 2477 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 92% | 27,282 psi | 46% | 2310 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,729 psi | 74% | 2516 fps | 99.8% |
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 115 powders for .280 Rem. loaded with the .284 | 160gr | Hornady CX. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,749 fps; across all powders the maximum-charge window runs from 1,621 fps to 2,749 fps. Accurate 3100 gives the best case fill at 100 %, and 115 of the 115 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (405 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.284" calls for a 1:8.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .280 Rem. with the .284 | 160gr | Hornady CX they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2213, Alliant Reloder-22, Bofors RP15 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.