Load Specifications
Load data in caliber .25 GT with .257 | 115gr | Nosler Ballistic Silver Tip bullet and 93 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 52 and ReloadSwiss RS 60.
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 2015 | <<locked>> | 88% | 53,505 psi | 86% | 2625 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 55,288 psi | 89% | 2694 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 54,201 psi | 87% | 2684 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 52,866 psi | 85% | 2697 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 53,447 psi | 86% | 2717 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 45,411 psi | 73% | 2667 fps | 97.4% |
| Accurate LT-30 | <<locked>> | 82% | 53,388 psi | 86% | 2572 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 53,780 psi | 87% | 2595 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 55,753 psi | 90% | 2756 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 96% | 53,243 psi | 86% | 2700 fps | 99% |
| ADI AR 2219 | <<locked>> | 82% | 53,388 psi | 86% | 2680 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 55,042 psi | 89% | 2713 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 90% | 54,868 psi | 88% | 2694 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 53,011 psi | 86% | 2762 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 55,071 psi | 89% | 2861 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 55,709 psi | 90% | 2766 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 84% | 53,476 psi | 86% | 2631 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 53,388 psi | 86% | 2743 fps | 99.2% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 45,542 psi | 73% | 2674 fps | 97.6% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 52,547 psi | 85% | 2822 fps | 99.8% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 55,492 psi | 90% | 2612 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 55,317 psi | 89% | 2769 fps | 99.1% |
| Bofors RP3 | <<locked>> | 98% | 56,057 psi | 90% | 2782 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 88% | 53,751 psi | 87% | 2651 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 53,650 psi | 87% | 2740 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 55,347 psi | 89% | 2828 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 86% | 55,956 psi | 90% | 2717 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 53,243 psi | 86% | 2690 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 54,302 psi | 88% | 2746 fps | 98.4% |
| Hodgdon H4895 | <<locked>> | 90% | 52,837 psi | 85% | 2717 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,756 psi | 67% | 2566 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 54,607 psi | 88% | 2792 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,795 psi | 56% | 1627 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 54,302 psi | 88% | 2720 fps | 99.7% |
| IMR 3031 | <<locked>> | 92% | 55,347 psi | 89% | 2749 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 52,663 psi | 85% | 2684 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 92% | 53,548 psi | 86% | 2664 fps | 96.1% |
| IMR 4198 | <<locked>> | 84% | 53,737 psi | 87% | 2592 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 55,579 psi | 90% | 2723 fps | 96.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 43,642 psi | 70% | 2618 fps | 97.1% |
| IMR 4895 | <<locked>> | 94% | 54,694 psi | 88% | 2772 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 90% | 55,042 psi | 89% | 2713 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 86% | 55,317 psi | 89% | 2703 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 54,491 psi | 88% | 2730 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 55,854 psi | 90% | 2687 fps | 99.6% |
| Lovex S062 | <<locked>> | 96% | 55,608 psi | 90% | 2733 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 51,126 psi | 82% | 2667 fps | 97.1% |
| Norma 201 | <<locked>> | 92% | 54,491 psi | 88% | 2703 fps | 99.9% |
| Norma 202 | <<locked>> | 92% | 54,969 psi | 89% | 2713 fps | 100% |
| Norma 203B | <<locked>> | 96% | 55,927 psi | 90% | 2779 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 45,905 psi | 74% | 2667 fps | 97.4% |
| Ramshot Big Game | <<locked>> | 94% | 52,649 psi | 85% | 2753 fps | 99.3% |
| Ramshot TAC | <<locked>> | 90% | 55,477 psi | 89% | 2726 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 90% | 54,534 psi | 88% | 2743 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 86% | 52,866 psi | 85% | 2667 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,998 psi | 56% | 1663 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 54,853 psi | 88% | 2700 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 54,882 psi | 89% | 2723 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 52,895 psi | 85% | 2799 fps | 99.2% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 56,101 psi | 90% | 2884 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 45,484 psi | 73% | 2687 fps | 97.1% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 46,775 psi | 75% | 2707 fps | 96.5% |
| Rottweil R 901 | <<locked>> | 90% | 55,347 psi | 89% | 2687 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 54,708 psi | 88% | 2697 fps | 99.9% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 55,985 psi | 90% | 2772 fps | 99.9% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 51,126 psi | 82% | 2667 fps | 97.1% |
| Shooters World Match Rifle | <<locked>> | 92% | 54,491 psi | 88% | 2730 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 55,608 psi | 90% | 2733 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 54,650 psi | 88% | 2671 fps | 99.8% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 54,143 psi | 87% | 2697 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 54,404 psi | 88% | 2785 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 54,099 psi | 87% | 2648 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 53,272 psi | 86% | 2697 fps | 98.1% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 53,925 psi | 87% | 2726 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 53,330 psi | 86% | 2608 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 56,043 psi | 90% | 2644 fps | 100% |
| Somchem S321 | <<locked>> | 86% | 52,808 psi | 85% | 2700 fps | 99.9% |
| Somchem S335 | <<locked>> | 92% | 55,608 psi | 90% | 2651 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 52,692 psi | 85% | 2694 fps | 99.3% |
| Somchem S355 | <<locked>> | 98% | 52,939 psi | 85% | 2720 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,915 psi | 66% | 2618 fps | 99.2% |
| Vihtavuori N130 | <<locked>> | 86% | 53,316 psi | 86% | 2582 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 53,287 psi | 86% | 2598 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 53,737 psi | 87% | 2671 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 55,114 psi | 89% | 2687 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 54,723 psi | 88% | 2707 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 48,109 psi | 78% | 2664 fps | 97.7% |
| Vihtavuori N530 | <<locked>> | 90% | 55,463 psi | 89% | 2710 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 53,476 psi | 86% | 2687 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,282 psi | 76% | 2671 fps | 97.4% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,545 psi | 80% | 2657 fps | 99.4% |
| Winchester 748 | <<locked>> | 90% | 54,549 psi | 88% | 2756 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 92% | 53,563 psi | 86% | 2733 fps | 99.7% |
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% | 41,626 psi | 67% | 2448 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 45,237 psi | 73% | 2546 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 34,127 psi | 55% | 2365 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 40,335 psi | 65% | 2500 fps | 99.6% |
| Accurate 4064 | <<locked>> | 80% | 32,271 psi | 52% | 2346 fps | 99% |
| Accurate 4350 | <<locked>> | 94% | 37,173 psi | 60% | 2510 fps | 95.2% |
| Accurate LT-30 | <<locked>> | 80% | 50,082 psi | 81% | 2526 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 50,473 psi | 81% | 2549 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 38,174 psi | 62% | 2454 fps | 96.9% |
| ADI AR 2208 | <<locked>> | 84% | 36,753 psi | 59% | 2405 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 49,980 psi | 81% | 2635 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,161 psi | 65% | 2467 fps | 98.4% |
| Alliant AR-Comp | <<locked>> | 80% | 39,204 psi | 63% | 2470 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 46,441 psi | 75% | 2654 fps | 99.1% |
| Alliant Power Pro 2000-MR | 30.3 gr | 82% | 36,912 psi | 60% | 2513 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,691 psi | 51% | 2329 fps | 95.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,934 psi | 76% | 2539 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 36,405 psi | 59% | 2438 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 94% | 38,101 psi | 61% | 2520 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 86% | 33,127 psi | 53% | 2434 fps | 95.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,849 psi | 79% | 2523 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 36,985 psi | 60% | 2444 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 30,821 psi | 50% | 2323 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,337 psi | 68% | 2467 fps | 99.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,218 psi | 62% | 2480 fps | 98.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 41,959 psi | 68% | 2605 fps | 97.3% |
| Hodgdon H322 | <<locked>> | 80% | 45,934 psi | 74% | 2572 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 46,485 psi | 75% | 2592 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 38,885 psi | 63% | 2477 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 38,464 psi | 62% | 2464 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 32,576 psi | 53% | 2365 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,229 psi | 55% | 2421 fps | 96.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,614 psi | 41% | 1447 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,985 psi | 60% | 2418 fps | 97% |
| IMR 3031 | <<locked>> | 80% | 37,507 psi | 60% | 2474 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 36,448 psi | 59% | 2392 fps | 95.8% |
| IMR 4166 Enduron | <<locked>> | 90% | 50,343 psi | 81% | 2612 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 47,964 psi | 77% | 2513 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 49,516 psi | 80% | 2631 fps | 95.1% |
| IMR 4831 | <<locked>> | 96% | 38,261 psi | 62% | 2513 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 34,896 psi | 56% | 2415 fps | 95.9% |
| IMR 8208 XBR | <<locked>> | 80% | 40,161 psi | 65% | 2467 fps | 98.4% |
| Lovex D073.5 | <<locked>> | 80% | 44,817 psi | 72% | 2546 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 36,680 psi | 59% | 2438 fps | 99.1% |
| Lovex S060 | <<locked>> | 80% | 39,131 psi | 63% | 2405 fps | 97.1% |
| Lovex S062 | <<locked>> | 80% | 33,939 psi | 55% | 2352 fps | 97% |
| Lovex S065 | <<locked>> | 94% | 42,757 psi | 69% | 2526 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 37,478 psi | 60% | 2415 fps | 98% |
| Norma 202 | <<locked>> | 80% | 37,666 psi | 61% | 2431 fps | 99.6% |
| Norma 203B | <<locked>> | 80% | 33,518 psi | 54% | 2372 fps | 95.4% |
| Norma URP | <<locked>> | 94% | 37,811 psi | 61% | 2510 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 82% | 35,375 psi | 57% | 2434 fps | 95.7% |
| Ramshot TAC | <<locked>> | 82% | 42,699 psi | 69% | 2513 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,131 psi | 63% | 2480 fps | 97% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,627 psi | 70% | 2513 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,918 psi | 42% | 1486 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,295 psi | 73% | 2556 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 48,457 psi | 78% | 2625 fps | 95.7% |
| ReloadSwiss RS 52 | 28.6 gr | 80% | 35,056 psi | 57% | 2467 fps | 95.2% |
| ReloadSwiss RS 60 | 29.1 gr | 80% | 29,269 psi | 47% | 2336 fps | 96.2% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 39,566 psi | 64% | 2575 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 43,859 psi | 71% | 2651 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 41,176 psi | 66% | 2464 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 35,607 psi | 57% | 2365 fps | 97.4% |
| Rottweil R 903 | <<locked>> | 82% | 31,038 psi | 50% | 2323 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 94% | 42,757 psi | 69% | 2526 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,680 psi | 59% | 2438 fps | 99.1% |
| Shooters World Precision | <<locked>> | 80% | 33,939 psi | 55% | 2352 fps | 97% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,616 psi | 77% | 2566 fps | 99.3% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 50,415 psi | 81% | 2644 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 34,316 psi | 55% | 2418 fps | 95.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,805 psi | 77% | 2559 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 40,828 psi | 66% | 2487 fps | 95.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,695 psi | 59% | 2421 fps | 96.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,131 psi | 63% | 2385 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,155 psi | 52% | 2254 fps | 99.3% |
| Somchem S321 | <<locked>> | 80% | 42,989 psi | 69% | 2543 fps | 99.2% |
| Somchem S335 | <<locked>> | 80% | 38,609 psi | 62% | 2388 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 37,652 psi | 61% | 2434 fps | 96.6% |
| Somchem S355 | <<locked>> | 82% | 32,242 psi | 52% | 2333 fps | 95.4% |
| Somchem S365 | <<locked>> | 90% | 29,733 psi | 48% | 2356 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 44,396 psi | 72% | 2454 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,276 psi | 63% | 2385 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,534 psi | 56% | 2365 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,433 psi | 57% | 2369 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 80% | 28,572 psi | 46% | 2228 fps | 95.6% |
| Vihtavuori N160 | <<locked>> | 94% | 39,958 psi | 64% | 2516 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 40,059 psi | 65% | 2461 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 80% | 34,026 psi | 55% | 2352 fps | 98.9% |
| Vihtavuori N550 | <<locked>> | 94% | 39,001 psi | 63% | 2520 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 33,417 psi | 54% | 2346 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 39,001 psi | 63% | 2500 fps | 99% |
| Winchester StaBALL Match | <<locked>> | 80% | 35,795 psi | 58% | 2421 fps | 96.8% |
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 109 powders for .25 GT loaded with the .257 | 115gr | Nosler Ballistic Silver Tip. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,884 fps; across all powders the maximum-charge window runs from 1,627 fps to 2,884 fps. Accurate 4350 gives the best case fill at 100 %, and 109 of the 109 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (427 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. The 115.0 gr projectile in 0.257" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 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 Power Pro 2000-MR, ReloadSwiss RS 52, ReloadSwiss RS 60 rank at the top here: for .25 GT with the .257 | 115gr | Nosler Ballistic Silver Tip they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-23, Alliant Reloder-26, Hodgdon H4350 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.