Load Specifications
Load data in caliber 7.5 x 55 Swiss with .308 | 180gr | Sierra HP 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 Alliant Reloder-17, ReloadSwiss RS 60 and ReloadSwiss RS 70.
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: 31"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 82% | 48,950 psi | 89% | 2585 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 46,905 psi | 85% | 2612 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 48,399 psi | 88% | 2671 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 49,676 psi | 90% | 2651 fps | 97.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 36,970 psi | 67% | 2552 fps | 96.4% |
| Accurate 4064 | <<locked>> | 88% | 46,934 psi | 85% | 2657 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 48,907 psi | 89% | 2779 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 84% | 47,863 psi | 87% | 2687 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 90% | 48,921 psi | 89% | 2687 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 82% | 47,239 psi | 86% | 2641 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 47,326 psi | 86% | 2615 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 46,717 psi | 85% | 2792 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 48,443 psi | 88% | 2707 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 48,950 psi | 89% | 2726 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 47,747 psi | 87% | 2785 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 94% | 48,399 psi | 88% | 2822 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,172 psi | 66% | 2595 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 39,972 psi | 73% | 2743 fps | 98.5% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 47,210 psi | 86% | 2700 fps | 99.6% |
| Bofors RP3 | <<locked>> | 90% | 48,559 psi | 88% | 2720 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 49,400 psi | 90% | 2690 fps | 97.5% |
| Hodgdon Benchmark | <<locked>> | 82% | 49,037 psi | 89% | 2621 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 48,994 psi | 89% | 2717 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 49,661 psi | 90% | 2733 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 96% | 48,559 psi | 88% | 2776 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 92% | 46,760 psi | 85% | 2687 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 84% | 48,283 psi | 88% | 2697 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 46,949 psi | 85% | 2710 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 47,108 psi | 85% | 2726 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 49,197 psi | 89% | 2808 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,143 psi | 64% | 1650 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 49,429 psi | 90% | 2697 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 47,834 psi | 87% | 2674 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 48,472 psi | 88% | 2671 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 48,559 psi | 88% | 2648 fps | 97.7% |
| IMR 4350 | <<locked>> | 98% | 49,153 psi | 89% | 2713 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 92% | 48,022 psi | 87% | 2671 fps | 97.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,690 psi | 90% | 2772 fps | 99.8% |
| IMR 4895 | <<locked>> | 86% | 47,268 psi | 86% | 2710 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 47,239 psi | 86% | 2641 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 47,079 psi | 85% | 2661 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 47,979 psi | 87% | 2618 fps | 99.9% |
| Lovex S062 | <<locked>> | 88% | 48,211 psi | 87% | 2667 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 47,297 psi | 86% | 2667 fps | 98.7% |
| Lovex S070 | <<locked>> | 96% | 47,848 psi | 87% | 2700 fps | 98% |
| Norma 201 | <<locked>> | 84% | 46,760 psi | 85% | 2631 fps | 100% |
| Norma 202 | <<locked>> | 84% | 47,239 psi | 86% | 2638 fps | 100% |
| Norma 203B | <<locked>> | 88% | 48,211 psi | 87% | 2713 fps | 100% |
| Norma 204 | <<locked>> | 98% | 49,516 psi | 90% | 2759 fps | 96.3% |
| Norma MRPᴾ | <<locked>> | 100% | 40,190 psi | 73% | 2700 fps | 95.9% |
| Norma URP | <<locked>> | 98% | 48,428 psi | 88% | 2769 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 88% | 48,080 psi | 87% | 2736 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 47,601 psi | 86% | 2769 fps | 98.6% |
| Ramshot TAC | <<locked>> | 82% | 47,021 psi | 85% | 2651 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 84% | 49,530 psi | 90% | 2720 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,723 psi | 65% | 1693 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 47,094 psi | 85% | 2664 fps | 98.1% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 48,617 psi | 88% | 2785 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 48,312 psi | 88% | 2822 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 48,269 psi | 88% | 2799 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 48,675 psi | 88% | 2825 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 82% | 48,138 psi | 87% | 2618 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 47,282 psi | 86% | 2631 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 48,428 psi | 88% | 2710 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 49,400 psi | 90% | 2690 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 94% | 47,297 psi | 86% | 2667 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 84% | 47,079 psi | 85% | 2661 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 48,211 psi | 87% | 2667 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 47,848 psi | 87% | 2700 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 46,775 psi | 85% | 2723 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 48,399 psi | 88% | 2677 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 49,269 psi | 89% | 2707 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 48,530 psi | 88% | 2575 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 48,414 psi | 88% | 2575 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 47,282 psi | 86% | 2618 fps | 97.6% |
| Somchem S335 | <<locked>> | 84% | 47,805 psi | 87% | 2575 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 48,167 psi | 87% | 2674 fps | 99.9% |
| Somchem S355 | <<locked>> | 92% | 49,197 psi | 89% | 2713 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,021 psi | 84% | 2769 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 43,120 psi | 78% | 2657 fps | 96.2% |
| Vihtavuori N133 | <<locked>> | 84% | 48,689 psi | 88% | 2559 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 49,777 psi | 90% | 2641 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 47,659 psi | 86% | 2615 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 47,181 psi | 86% | 2644 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 47,630 psi | 86% | 2713 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 82% | 47,224 psi | 86% | 2635 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 48,805 psi | 89% | 2661 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 46,746 psi | 85% | 2723 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,885 psi | 71% | 2661 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 48,225 psi | 88% | 2697 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 46,789 psi | 85% | 2684 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 48,892 psi | 89% | 2782 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,155 psi | 58% | 2595 fps | 99.2% |
| Winchester StaBALL Match | <<locked>> | 86% | 48,863 psi | 89% | 2713 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 31"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 46,050 psi | 84% | 2546 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,566 psi | 70% | 2480 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,252 psi | 82% | 2621 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 40,886 psi | 74% | 2497 fps | 95.1% |
| Accurate 3100 | <<locked>> | 98% | 34,650 psi | 63% | 2507 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 36,463 psi | 66% | 2480 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 28,239 psi | 51% | 2365 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 42,235 psi | 77% | 2589 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 36,042 psi | 65% | 2451 fps | 98.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,280 psi | 80% | 2592 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 44,048 psi | 80% | 2569 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 38,261 psi | 69% | 2625 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,331 psi | 64% | 2470 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,029 psi | 69% | 2530 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 82% | 29,356 psi | 53% | 2379 fps | 95.3% |
| Alliant Reloder-17 | 44.2 gr | 80% | 30,545 psi | 55% | 2448 fps | 97.8% |
| Alliant Reloder-23 | <<locked>> | 88% | 25,266 psi | 46% | 2293 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 92% | 30,516 psi | 55% | 2507 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,249 psi | 75% | 2595 fps | 98.9% |
| Bofors RP3 | <<locked>> | 80% | 34,940 psi | 63% | 2477 fps | 99.3% |
| Bofors RP7 | <<locked>> | 88% | 41,031 psi | 74% | 2546 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,282 psi | 84% | 2579 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,946 psi | 78% | 2618 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 35,737 psi | 65% | 2477 fps | 97.1% |
| Hodgdon H414 | <<locked>> | 88% | 37,492 psi | 68% | 2569 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 90% | 44,048 psi | 80% | 2641 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 42,569 psi | 77% | 2598 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 25,164 psi | 46% | 2234 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,493 psi | 70% | 2575 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 90% | 39,885 psi | 72% | 2635 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,252 psi | 48% | 1476 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,002 psi | 74% | 2556 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 42,061 psi | 76% | 2589 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,811 psi | 69% | 2480 fps | 98.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 40,234 psi | 73% | 2497 fps | 95.8% |
| IMR 4350 | <<locked>> | 92% | 40,901 psi | 74% | 2569 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 37,797 psi | 69% | 2480 fps | 95% |
| IMR 4831 | <<locked>> | 84% | 29,530 psi | 54% | 2379 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 38,914 psi | 71% | 2559 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 44,280 psi | 80% | 2592 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,089 psi | 75% | 2566 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 42,641 psi | 77% | 2526 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 37,666 psi | 68% | 2484 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 32,779 psi | 59% | 2379 fps | 95.1% |
| Lovex S070 | <<locked>> | 88% | 37,260 psi | 68% | 2503 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 41,452 psi | 75% | 2543 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 41,553 psi | 75% | 2546 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,391 psi | 68% | 2520 fps | 99% |
| Norma 204 | <<locked>> | 96% | 46,325 psi | 84% | 2707 fps | 95.5% |
| Norma MRP | <<locked>> | 98% | 37,637 psi | 68% | 2644 fps | 95% |
| Norma URP | <<locked>> | 82% | 29,095 psi | 53% | 2372 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 36,912 psi | 67% | 2533 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 34,476 psi | 63% | 2507 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 44,150 psi | 80% | 2602 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,511 psi | 79% | 2621 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,614 psi | 48% | 1512 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 36,318 psi | 66% | 2461 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,653 psi | 72% | 2628 fps | 99.1% |
| ReloadSwiss RS 60 | 44.2 gr | 80% | 32,532 psi | 59% | 2510 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 30,168 psi | 55% | 2431 fps | 95.5% |
| ReloadSwiss RS 70 | 48.2 gr | 86% | 32,779 psi | 59% | 2490 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 45,353 psi | 82% | 2572 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,465 psi | 72% | 2497 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 32,692 psi | 59% | 2421 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 88% | 41,031 psi | 74% | 2546 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 82% | 32,779 psi | 59% | 2379 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,089 psi | 75% | 2566 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 37,666 psi | 68% | 2484 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 37,260 psi | 68% | 2503 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,808 psi | 61% | 2470 fps | 98.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,395 psi | 77% | 2575 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,770 psi | 74% | 2562 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,873 psi | 78% | 2487 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,505 psi | 64% | 2365 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 38,682 psi | 70% | 2470 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 42,453 psi | 77% | 2493 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,989 psi | 76% | 2572 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 33,794 psi | 61% | 2431 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 24,453 psi | 44% | 2274 fps | 96.7% |
| Somchem S385 | <<locked>> | 98% | 40,277 psi | 73% | 2605 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 43,134 psi | 78% | 2480 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,638 psi | 70% | 2474 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,262 psi | 71% | 2484 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,923 psi | 58% | 2365 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 82% | 30,472 psi | 55% | 2372 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 44,411 psi | 81% | 2589 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 37,826 psi | 69% | 2480 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 29,762 psi | 54% | 2375 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 88% | 26,585 psi | 48% | 2362 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,529 psi | 52% | 2297 fps | 97% |
| Winchester 748 | <<locked>> | 80% | 43,743 psi | 79% | 2631 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 37,710 psi | 68% | 2572 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 92% | 25,164 psi | 46% | 2356 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,059 psi | 73% | 2566 fps | 99.7% |
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 112 powders for 7.5 x 55 Swiss loaded with the .308 | 180gr | Sierra HP MatchKing. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,825 fps; across all powders the maximum-charge window runs from 1,650 fps to 2,825 fps. Accurate 3100 gives the best case fill at 100 %, and 112 of the 112 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (380 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:13.0 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. Alliant Reloder-17, ReloadSwiss RS 60, ReloadSwiss RS 70 rank at the top here: for 7.5 x 55 Swiss with the .308 | 180gr | Sierra HP MatchKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2213, Alliant Reloder-22, Alliant Reloder-25 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.