Load Specifications
Load data in caliber .25 GT with .257 | 110gr | Rhino Solid Shank 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 Power Pro 2000-MR, ReloadSwiss RS 60 and Ramshot Big Game.
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% | 54,882 psi | 89% | 2726 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 52,939 psi | 85% | 2746 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 55,579 psi | 90% | 2782 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 54,534 psi | 88% | 2805 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 55,158 psi | 89% | 2822 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 47,442 psi | 77% | 2779 fps | 97.8% |
| Accurate LT-30 | <<locked>> | 82% | 54,041 psi | 87% | 2667 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 54,447 psi | 88% | 2690 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 53,664 psi | 87% | 2812 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 96% | 54,650 psi | 88% | 2805 fps | 99.2% |
| ADI AR 2219 | <<locked>> | 82% | 54,737 psi | 88% | 2785 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 53,127 psi | 86% | 2769 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 88% | 52,750 psi | 85% | 2753 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 54,505 psi | 88% | 2871 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 53,113 psi | 86% | 2917 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 53,722 psi | 87% | 2825 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 84% | 54,346 psi | 88% | 2726 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 54,882 psi | 89% | 2848 fps | 99.3% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 46,920 psi | 76% | 2782 fps | 97.9% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 54,462 psi | 88% | 2940 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 53,548 psi | 86% | 2667 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 53,171 psi | 86% | 2822 fps | 98.8% |
| Bofors RP3 | <<locked>> | 96% | 54,302 psi | 88% | 2841 fps | 99.9% |
| Bofors RP7ᴾ | <<locked>> | 100% | 55,056 psi | 89% | 2799 fps | 95.8% |
| Hodgdon Benchmark | <<locked>> | 88% | 55,187 psi | 89% | 2759 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 55,448 psi | 89% | 2851 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 53,388 psi | 86% | 2887 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 84% | 53,780 psi | 87% | 2772 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 54,607 psi | 88% | 2795 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 55,883 psi | 90% | 2854 fps | 98.6% |
| Hodgdon H4895 | <<locked>> | 90% | 54,114 psi | 87% | 2822 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 43,178 psi | 70% | 2671 fps | 98.4% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 52,982 psi | 85% | 2854 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,664 psi | 56% | 1690 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 55,405 psi | 89% | 2825 fps | 99.8% |
| IMR 3031 | <<locked>> | 90% | 53,534 psi | 86% | 2812 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 54,259 psi | 88% | 2792 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 92% | 54,897 psi | 89% | 2769 fps | 96.3% |
| IMR 4198 | <<locked>> | 84% | 54,897 psi | 89% | 2694 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 53,766 psi | 87% | 2782 fps | 96% |
| IMR 4831ᴾ | <<locked>> | 100% | 45,440 psi | 73% | 2726 fps | 97.5% |
| IMR 4895 | <<locked>> | 92% | 52,533 psi | 85% | 2825 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 88% | 53,127 psi | 86% | 2769 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 84% | 52,794 psi | 85% | 2753 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 52,692 psi | 85% | 2789 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 53,867 psi | 87% | 2743 fps | 99.5% |
| Lovex S062 | <<locked>> | 94% | 53,417 psi | 86% | 2785 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 52,678 psi | 85% | 2776 fps | 97.4% |
| Norma 201 | <<locked>> | 92% | 55,767 psi | 90% | 2808 fps | 100% |
| Norma 202 | <<locked>> | 90% | 52,997 psi | 85% | 2769 fps | 100% |
| Norma 203B | <<locked>> | 94% | 53,954 psi | 87% | 2835 fps | 99.5% |
| Norma URPᴾ | <<locked>> | 100% | 47,326 psi | 76% | 2772 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 94% | 54,085 psi | 87% | 2858 fps | 99.5% |
| Ramshot TAC | <<locked>> | 88% | 53,374 psi | 86% | 2779 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 88% | 52,576 psi | 85% | 2802 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 86% | 54,288 psi | 88% | 2772 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,230 psi | 57% | 1736 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 52,634 psi | 85% | 2756 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 53,069 psi | 86% | 2782 fps | 96.7% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 54,940 psi | 89% | 2917 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 54,259 psi | 88% | 2943 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 47,340 psi | 76% | 2799 fps | 97.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 48,254 psi | 78% | 2818 fps | 96.9% |
| Rottweil R 901 | <<locked>> | 88% | 53,374 psi | 86% | 2746 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 55,985 psi | 90% | 2802 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 54,186 psi | 87% | 2831 fps | 99.8% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 55,056 psi | 89% | 2799 fps | 95.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 52,678 psi | 85% | 2776 fps | 97.4% |
| Shooters World Match Rifle | <<locked>> | 90% | 52,692 psi | 85% | 2789 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 53,417 psi | 86% | 2785 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 55,985 psi | 90% | 2776 fps | 99.9% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 55,129 psi | 89% | 2799 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 55,724 psi | 90% | 2890 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 55,390 psi | 89% | 2749 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 54,940 psi | 89% | 2805 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 55,709 psi | 90% | 2835 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 54,520 psi | 88% | 2710 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 54,157 psi | 87% | 2703 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 53,287 psi | 86% | 2730 fps | 96% |
| Somchem S321 | <<locked>> | 86% | 53,925 psi | 87% | 2799 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 53,693 psi | 87% | 2710 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 54,331 psi | 88% | 2799 fps | 99.5% |
| Somchem S355 | <<locked>> | 98% | 54,752 psi | 88% | 2831 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 42,163 psi | 68% | 2723 fps | 99.4% |
| Vihtavuori N130 | <<locked>> | 86% | 54,331 psi | 88% | 2680 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 54,476 psi | 88% | 2697 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 55,376 psi | 89% | 2776 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 53,359 psi | 86% | 2746 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 52,939 psi | 85% | 2766 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 49,908 psi | 80% | 2776 fps | 98% |
| Vihtavuori N530 | <<locked>> | 88% | 53,374 psi | 86% | 2766 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 94% | 54,694 psi | 88% | 2785 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 48,892 psi | 79% | 2776 fps | 97.7% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 50,981 psi | 82% | 2762 fps | 99.6% |
| Winchester 748 | <<locked>> | 88% | 52,750 psi | 85% | 2815 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 92% | 55,230 psi | 89% | 2844 fps | 99.8% |
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 2015 | <<locked>> | 80% | 42,569 psi | 69% | 2543 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 46,470 psi | 75% | 2648 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,302 psi | 57% | 2461 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 41,553 psi | 67% | 2598 fps | 99.7% |
| Accurate 4064 | <<locked>> | 80% | 33,402 psi | 54% | 2444 fps | 99.1% |
| Accurate 4350 | <<locked>> | 94% | 38,551 psi | 62% | 2615 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 50,908 psi | 82% | 2621 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 51,300 psi | 83% | 2644 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 39,146 psi | 63% | 2549 fps | 97% |
| ADI AR 2208 | <<locked>> | 82% | 35,679 psi | 58% | 2454 fps | 95.1% |
| ADI AR 2219 | <<locked>> | 80% | 51,459 psi | 83% | 2740 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,162 psi | 66% | 2566 fps | 98.6% |
| Alliant AR-Comp | <<locked>> | 80% | 40,611 psi | 66% | 2572 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 47,732 psi | 77% | 2759 fps | 99.2% |
| Alliant Power Pro 2000-MR | 32.2 gr | 82% | 37,710 psi | 61% | 2612 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,416 psi | 52% | 2418 fps | 95.9% |
| Alliant Reloder-10x | <<locked>> | 80% | 48,051 psi | 78% | 2638 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,070 psi | 57% | 2477 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 94% | 39,291 psi | 63% | 2625 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 86% | 34,287 psi | 55% | 2536 fps | 95.7% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,227 psi | 81% | 2621 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,247 psi | 62% | 2549 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 31,720 psi | 51% | 2415 fps | 95.8% |
| Bofors RP7 | <<locked>> | 98% | 51,822 psi | 84% | 2749 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,352 psi | 70% | 2566 fps | 99.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 39,276 psi | 63% | 2575 fps | 98.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 43,308 psi | 70% | 2710 fps | 97.6% |
| Hodgdon H322 | <<locked>> | 80% | 47,108 psi | 76% | 2671 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 47,645 psi | 77% | 2690 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 40,132 psi | 65% | 2579 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 39,465 psi | 64% | 2562 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 33,518 psi | 54% | 2461 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,302 psi | 57% | 2523 fps | 97% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,701 psi | 41% | 1506 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,956 psi | 61% | 2516 fps | 97.2% |
| IMR 3031 | <<locked>> | 80% | 38,479 psi | 62% | 2569 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,882 psi | 56% | 2431 fps | 95.1% |
| IMR 4166 Enduron | <<locked>> | 90% | 51,372 psi | 83% | 2713 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 48,921 psi | 79% | 2608 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 50,691 psi | 82% | 2733 fps | 95.4% |
| IMR 4831 | <<locked>> | 94% | 37,362 psi | 60% | 2569 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 35,882 psi | 58% | 2510 fps | 96.2% |
| IMR 8208 XBR | <<locked>> | 80% | 41,162 psi | 66% | 2566 fps | 98.6% |
| Lovex D073.5 | <<locked>> | 80% | 46,383 psi | 75% | 2654 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 37,608 psi | 61% | 2533 fps | 99.2% |
| Lovex S060 | <<locked>> | 80% | 39,813 psi | 64% | 2497 fps | 97.2% |
| Lovex S062 | <<locked>> | 80% | 34,708 psi | 56% | 2441 fps | 97.2% |
| Lovex S065 | <<locked>> | 94% | 43,685 psi | 70% | 2621 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 38,580 psi | 62% | 2513 fps | 98.1% |
| Norma 202 | <<locked>> | 80% | 38,406 psi | 62% | 2523 fps | 99.6% |
| Norma 203B | <<locked>> | 80% | 34,461 psi | 56% | 2467 fps | 95.6% |
| Norma URP | <<locked>> | 94% | 39,044 psi | 63% | 2612 fps | 95.5% |
| Ramshot Big Game | 32.2 gr | 82% | 36,187 psi | 58% | 2530 fps | 95.9% |
| Ramshot TAC | <<locked>> | 82% | 43,859 psi | 71% | 2612 fps | 95.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 40,118 psi | 65% | 2579 fps | 97.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 44,599 psi | 72% | 2612 fps | 98.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,947 psi | 42% | 1545 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 46,282 psi | 75% | 2654 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 46,325 psi | 75% | 2667 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 36,245 psi | 58% | 2572 fps | 95.5% |
| ReloadSwiss RS 60 | 31 gr | 80% | 30,095 psi | 49% | 2434 fps | 96.5% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 41,133 psi | 66% | 2684 fps | 95.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 42,032 psi | 68% | 2694 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 42,105 psi | 68% | 2559 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 36,767 psi | 59% | 2467 fps | 97.7% |
| Rottweil R 903 | <<locked>> | 82% | 31,952 psi | 52% | 2415 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 98% | 51,822 psi | 84% | 2749 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 94% | 43,685 psi | 70% | 2621 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,608 psi | 61% | 2533 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 34,708 psi | 56% | 2441 fps | 97.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 48,747 psi | 79% | 2664 fps | 99.4% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 51,576 psi | 83% | 2746 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 35,447 psi | 57% | 2516 fps | 95.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 48,921 psi | 79% | 2657 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 42,018 psi | 68% | 2589 fps | 95.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,826 psi | 61% | 2520 fps | 96.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,045 psi | 65% | 2477 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,953 psi | 53% | 2343 fps | 99.4% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 49,574 psi | 80% | 2674 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 44,367 psi | 72% | 2644 fps | 99.3% |
| Somchem S335 | <<locked>> | 80% | 39,697 psi | 64% | 2484 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 38,943 psi | 63% | 2533 fps | 96.9% |
| Somchem S355 | <<locked>> | 82% | 33,127 psi | 53% | 2428 fps | 95.7% |
| Somchem S365 | <<locked>> | 88% | 28,848 psi | 47% | 2398 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 45,382 psi | 73% | 2549 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,205 psi | 65% | 2477 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,520 psi | 57% | 2457 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,434 psi | 59% | 2461 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 80% | 29,443 psi | 47% | 2316 fps | 95.8% |
| Vihtavuori N160 | <<locked>> | 92% | 38,334 psi | 62% | 2559 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 41,046 psi | 66% | 2559 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 80% | 35,172 psi | 57% | 2451 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 94% | 40,074 psi | 65% | 2615 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 34,214 psi | 55% | 2438 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 40,205 psi | 65% | 2602 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,854 psi | 59% | 2520 fps | 97% |
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 .25 GT loaded with the .257 | 110gr | Rhino Solid Shank. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,943 fps; across all powders the maximum-charge window runs from 1,690 fps to 2,943 fps. Accurate 4350 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 (427 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 110.0 gr projectile in 0.257" calls for a 1:12.0 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 60, Ramshot Big Game rank at the top here: for .25 GT with the .257 | 110gr | Rhino Solid Shank 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.