
Load Specifications
Load data in caliber .280 Rem. with .284 | 168gr | CutEdge MTH bullet and 96 powders. The key underlying parameters are shown in the table above.
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>> | 84% | 50,952 psi | 87% | 2500 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 49,995 psi | 85% | 2510 fps | 97.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,165 psi | 77% | 2530 fps | 98.4% |
| Accurate 4064 | <<locked>> | 86% | 51,271 psi | 87% | 2549 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 51,126 psi | 87% | 2635 fps | 99.9% |
| Accurate High Countryᴾ | <<locked>> | 100% | 49,472 psi | 84% | 2707 fps | 96% |
| ADI AR 2206H | <<locked>> | 82% | 51,459 psi | 88% | 2575 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 52,504 psi | 89% | 2579 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,011 psi | 90% | 2674 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 51,039 psi | 87% | 2687 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 52,141 psi | 89% | 2585 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 52,692 psi | 90% | 2602 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 53,040 psi | 90% | 2618 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 52,431 psi | 89% | 2690 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 49,995 psi | 85% | 2667 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,025 psi | 89% | 2664 fps | 97.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 45,397 psi | 77% | 2602 fps | 96.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,917 psi | 73% | 2556 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 37,521 psi | 64% | 2467 fps | 97.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 48,341 psi | 82% | 2720 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 51,184 psi | 87% | 2592 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 53,026 psi | 90% | 2612 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 45,397 psi | 77% | 2602 fps | 96.1% |
| Bofors RP7 | <<locked>> | 92% | 53,084 psi | 90% | 2595 fps | 98.4% |
| Hodgdon BL-C2 | <<locked>> | 82% | 53,026 psi | 90% | 2602 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 50,560 psi | 86% | 2579 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 50,502 psi | 86% | 2635 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 90% | 51,227 psi | 87% | 2602 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 82% | 52,011 psi | 89% | 2585 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 52,431 psi | 89% | 2621 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 51,532 psi | 88% | 2618 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 50,488 psi | 86% | 2667 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,795 psi | 61% | 1591 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 49,705 psi | 85% | 2536 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 52,344 psi | 89% | 2566 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 51,924 psi | 88% | 2562 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 51,590 psi | 88% | 2546 fps | 98.5% |
| IMR 4350 | <<locked>> | 94% | 50,314 psi | 86% | 2575 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 90% | 51,721 psi | 88% | 2575 fps | 98.5% |
| IMR 4831 | <<locked>> | 96% | 51,880 psi | 88% | 2631 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 51,111 psi | 87% | 2598 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 51,227 psi | 87% | 2552 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 50,792 psi | 86% | 2507 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 51,793 psi | 88% | 2559 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 51,372 psi | 87% | 2572 fps | 99.4% |
| Lovex S070 | <<locked>> | 94% | 52,214 psi | 89% | 2605 fps | 98.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 37,304 psi | 64% | 2388 fps | 96.5% |
| Norma 201 | <<locked>> | 82% | 50,212 psi | 85% | 2523 fps | 100% |
| Norma 202 | <<locked>> | 82% | 50,778 psi | 86% | 2523 fps | 100% |
| Norma 203B | <<locked>> | 86% | 52,330 psi | 89% | 2608 fps | 100% |
| Norma 204 | <<locked>> | 94% | 50,763 psi | 86% | 2618 fps | 96.9% |
| Norma MRPᴾ | <<locked>> | 100% | 48,022 psi | 82% | 2680 fps | 98.1% |
| Norma URP | <<locked>> | 94% | 50,589 psi | 86% | 2628 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 86% | 52,924 psi | 90% | 2635 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 52,562 psi | 89% | 2674 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,230 psi | 62% | 1627 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 50,778 psi | 86% | 2566 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 50,009 psi | 85% | 2628 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 49,603 psi | 84% | 2661 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 50,966 psi | 87% | 2661 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 50,082 psi | 85% | 2684 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 84% | 50,836 psi | 87% | 2526 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 49,879 psi | 85% | 2562 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 51,256 psi | 87% | 2595 fps | 95.9% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 50,879 psi | 87% | 2648 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 92% | 53,084 psi | 90% | 2595 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 51,372 psi | 87% | 2572 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 82% | 51,227 psi | 87% | 2552 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 51,793 psi | 88% | 2559 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 52,214 psi | 89% | 2605 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 51,430 psi | 88% | 2618 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 52,069 psi | 89% | 2575 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 49,748 psi | 85% | 2549 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 51,459 psi | 88% | 2464 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 51,967 psi | 88% | 2467 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 51,126 psi | 87% | 2526 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 50,386 psi | 86% | 2641 fps | 97.2% |
| Somchem S335 | <<locked>> | 82% | 51,068 psi | 87% | 2464 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 52,083 psi | 89% | 2569 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 50,256 psi | 86% | 2562 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 52,359 psi | 89% | 2677 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 51,358 psi | 87% | 2625 fps | 98.1% |
| Vihtavuori N133 | <<locked>> | 82% | 51,938 psi | 88% | 2451 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 50,879 psi | 87% | 2490 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 51,198 psi | 87% | 2503 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 51,488 psi | 88% | 2543 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 52,779 psi | 90% | 2621 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 44,367 psi | 76% | 2500 fps | 96.2% |
| Vihtavuori N540 | <<locked>> | 86% | 52,837 psi | 90% | 2549 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 51,953 psi | 88% | 2631 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 47,645 psi | 81% | 2625 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 52,750 psi | 90% | 2602 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 50,821 psi | 87% | 2641 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,130 psi | 65% | 2582 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 52,997 psi | 90% | 2605 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 48,153 psi | 82% | 2562 fps | 96.4% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 44,614 psi | 76% | 2411 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 43,613 psi | 74% | 2405 fps | 96.2% |
| Accurate 3100 | <<locked>> | 92% | 34,113 psi | 58% | 2320 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 42,279 psi | 72% | 2415 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 31,357 psi | 53% | 2270 fps | 96.3% |
| Accurate High Country | <<locked>> | 98% | 46,006 psi | 78% | 2648 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 48,356 psi | 82% | 2530 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 41,104 psi | 70% | 2392 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 43,439 psi | 74% | 2510 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,266 psi | 75% | 2575 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 48,979 psi | 83% | 2539 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,872 psi | 70% | 2411 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,918 psi | 75% | 2474 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,647 psi | 54% | 2283 fps | 96.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,462 psi | 60% | 2402 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 94% | 42,859 psi | 73% | 2507 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 98% | 42,554 psi | 72% | 2546 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 84% | 25,788 psi | 44% | 2152 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 96% | 33,156 psi | 56% | 2359 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 88% | 31,343 psi | 53% | 2362 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,819 psi | 81% | 2539 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 40,567 psi | 69% | 2418 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 42,554 psi | 72% | 2546 fps | 95.2% |
| Bofors RP7 | <<locked>> | 82% | 38,725 psi | 66% | 2346 fps | 95.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,487 psi | 84% | 2549 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,176 psi | 70% | 2421 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 84% | 38,566 psi | 66% | 2421 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 84% | 42,177 psi | 72% | 2448 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 48,834 psi | 83% | 2536 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,950 psi | 49% | 2188 fps | 97.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,063 psi | 77% | 2520 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 40,625 psi | 69% | 2490 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,745 psi | 46% | 1421 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,673 psi | 79% | 2490 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 48,965 psi | 83% | 2520 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,163 psi | 73% | 2425 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,600 psi | 78% | 2448 fps | 97.5% |
| IMR 4350 | <<locked>> | 86% | 39,204 psi | 67% | 2379 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 37,971 psi | 65% | 2329 fps | 95.3% |
| IMR 4831 | <<locked>> | 80% | 30,487 psi | 52% | 2231 fps | 96% |
| IMR 4895 | <<locked>> | 80% | 45,020 psi | 77% | 2500 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 47,718 psi | 81% | 2503 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,747 psi | 81% | 2461 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 42,859 psi | 73% | 2418 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 35,302 psi | 60% | 2283 fps | 96.1% |
| Lovex S070 | <<locked>> | 84% | 37,927 psi | 65% | 2356 fps | 95.8% |
| Lovex S071 | <<locked>> | 98% | 34,838 psi | 59% | 2336 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 47,152 psi | 80% | 2477 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,659 psi | 81% | 2477 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,279 psi | 74% | 2464 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 44,338 psi | 75% | 2513 fps | 95.3% |
| Norma MRP | <<locked>> | 94% | 39,059 psi | 66% | 2507 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 31,676 psi | 54% | 2270 fps | 96.2% |
| Ramshot Big Game | <<locked>> | 80% | 42,960 psi | 73% | 2477 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 35,288 psi | 60% | 2362 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,963 psi | 46% | 1453 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,640 psi | 71% | 2411 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,804 psi | 80% | 2575 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,782 psi | 64% | 2457 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,067 psi | 53% | 2283 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 33,156 psi | 56% | 2343 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 44,802 psi | 76% | 2434 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 38,116 psi | 65% | 2365 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 48,095 psi | 82% | 2543 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 94% | 41,423 psi | 71% | 2484 fps | 95% |
| Rottweil R 907 | <<locked>> | 82% | 38,725 psi | 66% | 2346 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,302 psi | 60% | 2283 fps | 96.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,718 psi | 81% | 2503 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,859 psi | 73% | 2418 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 37,927 psi | 65% | 2356 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,378 psi | 67% | 2418 fps | 99.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,573 psi | 83% | 2523 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,746 psi | 80% | 2500 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,254 psi | 82% | 2418 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,350 psi | 69% | 2300 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 36,854 psi | 63% | 2280 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 44,106 psi | 75% | 2536 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 48,022 psi | 82% | 2425 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,631 psi | 83% | 2520 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 38,943 psi | 66% | 2372 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 28,268 psi | 48% | 2228 fps | 98.3% |
| Somchem S385 | <<locked>> | 92% | 39,436 psi | 67% | 2421 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 48,762 psi | 83% | 2408 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,585 psi | 76% | 2405 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,107 psi | 77% | 2418 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,999 psi | 63% | 2310 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 33,170 psi | 56% | 2274 fps | 96.7% |
| Vihtavuori N165 | <<locked>> | 98% | 41,321 psi | 70% | 2444 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 43,308 psi | 74% | 2411 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 32,460 psi | 55% | 2270 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 84% | 27,804 psi | 47% | 2221 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,706 psi | 56% | 2254 fps | 98.6% |
| Winchester 760 | <<locked>> | 84% | 38,798 psi | 66% | 2428 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 88% | 25,672 psi | 44% | 2221 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,456 psi | 79% | 2507 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 45,049 psi | 77% | 2513 fps | 95.6% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 110 powders for .280 Rem. loaded with the .284 | 168gr | CutEdge MTH. Alliant Reloder-26 delivers the highest muzzle velocity at 2,720 fps; across all powders the maximum-charge window runs from 1,591 fps to 2,720 fps. Accurate 3100 gives the best case fill at 100 %, and 110 of the 110 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (405 MPa), the top charges use 61–90 %, leaving at least 10 % headroom. The 168.0 gr projectile in 0.284" calls for a 1:7.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, Accurate MAGPRO 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. As outliers, Accurate MAGPRO, ADI AR 2213, 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.