Load Specifications
Bullet Manufacturer:Remington
Bullet Weight:122 gr
Bullet Diameter:0.257"
Bullet Length:<<locked>>
Caliber:.25 GT load data
Case Length (l3):1.725"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:43.5 Grains of Water
Primer Size:Small Rifle (SR)
Barrel Length:24"
Max. allowed Pressure:62,001 psi
Recommended Twist Rate:1:12.5
Load data in caliber .25 GT with .257 | 122gr | Remington SP Extended-Range bullet and 102 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, Alliant Reloder-17 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.
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>> | 86% | 55,579 psi | 90% | 2595 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,302 psi | 88% | 2625 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,056 psi | 87% | 2621 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,767 psi | 90% | 2680 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 53,374 psi | 86% | 2612 fps | 96.5% |
| Accurate 4064 | <<locked>> | 92% | 53,766 psi | 87% | 2664 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,040 psi | 86% | 2736 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 88% | 54,926 psi | 89% | 2697 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 94% | 55,854 psi | 90% | 2694 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 86% | 53,751 psi | 87% | 2648 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 54,447 psi | 88% | 2625 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,492 psi | 90% | 2746 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,259 psi | 88% | 2805 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,361 psi | 89% | 2710 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,303 psi | 89% | 2598 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 55,883 psi | 90% | 2730 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,256 psi | 83% | 2736 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 98% | 55,854 psi | 90% | 2828 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,579 psi | 59% | 2487 fps | 98% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,538 psi | 65% | 2628 fps | 96.9% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,244 psi | 87% | 2707 fps | 99.6% |
| Bofors RP3 | <<locked>> | 92% | 52,359 psi | 84% | 2677 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 53,084 psi | 86% | 2648 fps | 96.7% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,579 psi | 90% | 2628 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 52,939 psi | 85% | 2677 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,839 psi | 88% | 2769 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 54,476 psi | 88% | 2641 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,419 psi | 89% | 2667 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 53,664 psi | 87% | 2690 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 98% | 52,605 psi | 85% | 2730 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 96% | 53,722 psi | 87% | 2697 fps | 96.2% |
| Hodgdon H4895 | <<locked>> | 88% | 55,434 psi | 89% | 2707 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,616 psi | 77% | 2625 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 54,404 psi | 88% | 2736 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 53,505 psi | 86% | 2766 fps | 97% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,404 psi | 57% | 1617 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 53,330 psi | 86% | 2661 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 55,230 psi | 89% | 2687 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 54,984 psi | 89% | 2674 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,361 psi | 89% | 2657 fps | 97.7% |
| IMR 4198 | <<locked>> | 82% | 55,434 psi | 89% | 2556 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,866 psi | 85% | 2671 fps | 96.8% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,868 psi | 88% | 2677 fps | 97.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,502 psi | 81% | 2680 fps | 99.2% |
| IMR 4895 | <<locked>> | 90% | 54,041 psi | 87% | 2713 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 53,751 psi | 87% | 2648 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 53,737 psi | 87% | 2631 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,462 psi | 88% | 2674 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,665 psi | 88% | 2628 fps | 99.9% |
| Lovex S062 | <<locked>> | 92% | 54,810 psi | 88% | 2671 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 54,056 psi | 87% | 2674 fps | 98.6% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,708 psi | 88% | 2703 fps | 97.9% |
| Norma 201 | <<locked>> | 88% | 53,766 psi | 87% | 2644 fps | 100% |
| Norma 202 | <<locked>> | 88% | 53,824 psi | 87% | 2644 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,042 psi | 89% | 2720 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 52,315 psi | 84% | 2726 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 92% | 55,970 psi | 90% | 2749 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,213 psi | 83% | 2720 fps | 97.9% |
| Ramshot TAC | <<locked>> | 86% | 54,099 psi | 87% | 2664 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 86% | 53,606 psi | 86% | 2684 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,969 psi | 89% | 2651 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,665 psi | 58% | 1650 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,243 psi | 86% | 2628 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 53,969 psi | 87% | 2671 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 52,678 psi | 85% | 2743 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 56,072 psi | 90% | 2835 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,736 psi | 85% | 2759 fps | 99.3% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,823 psi | 85% | 2782 fps | 99% |
| Rottweil R 901 | <<locked>> | 86% | 54,476 psi | 88% | 2625 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 53,940 psi | 87% | 2638 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,579 psi | 90% | 2717 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 53,084 psi | 86% | 2648 fps | 96.7% |
| Shooters World Long Rifle | <<locked>> | 98% | 54,056 psi | 87% | 2674 fps | 98.6% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,462 psi | 88% | 2674 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,810 psi | 88% | 2671 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,708 psi | 88% | 2703 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 53,853 psi | 87% | 2726 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 55,927 psi | 90% | 2694 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 53,026 psi | 86% | 2667 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,332 psi | 89% | 2585 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,259 psi | 89% | 2582 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,259 psi | 88% | 2625 fps | 97.4% |
| Somchem S321 | <<locked>> | 84% | 54,795 psi | 88% | 2677 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,737 psi | 88% | 2589 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,376 psi | 89% | 2684 fps | 99.9% |
| Somchem S355 | <<locked>> | 96% | 55,883 psi | 90% | 2713 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,760 psi | 75% | 2677 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 55,129 psi | 89% | 2549 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,463 psi | 89% | 2569 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 53,534 psi | 86% | 2608 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,259 psi | 88% | 2621 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 53,998 psi | 87% | 2648 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,013 psi | 89% | 2723 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 86% | 54,491 psi | 88% | 2651 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 52,475 psi | 85% | 2621 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,940 psi | 87% | 2726 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,552 psi | 64% | 2559 fps | 97.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,608 psi | 90% | 2707 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 53,925 psi | 87% | 2690 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 52,605 psi | 85% | 2730 fps | 97.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,648 psi | 53% | 2470 fps | 97.2% |
| Winchester StaBALL Match | <<locked>> | 88% | 52,678 psi | 85% | 2674 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% | 46,311 psi | 75% | 2470 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,705 psi | 82% | 2575 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,160 psi | 63% | 2402 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,643 psi | 74% | 2539 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 47,050 psi | 76% | 2513 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 37,014 psi | 60% | 2395 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 35,201 psi | 57% | 2421 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 42,627 psi | 69% | 2497 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 80% | 36,187 psi | 58% | 2352 fps | 96.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,701 psi | 72% | 2507 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 44,469 psi | 72% | 2493 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,156 psi | 84% | 2697 fps | 100% |
| Alliant Power Pro 2000-MR | 31.5 gr | 80% | 38,450 psi | 62% | 2516 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,679 psi | 58% | 2375 fps | 98.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,996 psi | 84% | 2556 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,421 psi | 62% | 2434 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 33,576 psi | 54% | 2382 fps | 95.1% |
| Alliant Reloder-17 | 31 gr | 80% | 30,661 psi | 49% | 2336 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 30,472 psi | 49% | 2333 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 37,811 psi | 61% | 2569 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,814 psi | 67% | 2500 fps | 97.8% |
| Bofors RP3 | <<locked>> | 80% | 35,143 psi | 57% | 2375 fps | 98.1% |
| Bofors RP7 | <<locked>> | 92% | 46,717 psi | 75% | 2546 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,340 psi | 75% | 2493 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,149 psi | 70% | 2523 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,718 psi | 77% | 2661 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 80% | 51,184 psi | 83% | 2595 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,779 psi | 84% | 2618 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,027 psi | 58% | 2379 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 92% | 43,134 psi | 70% | 2572 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 94% | 50,662 psi | 82% | 2651 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 42,989 psi | 69% | 2507 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 28,892 psi | 47% | 2238 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,798 psi | 63% | 2477 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 94% | 46,572 psi | 75% | 2651 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,353 psi | 43% | 1444 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,278 psi | 67% | 2461 fps | 98.9% |
| IMR 3031 | <<locked>> | 80% | 42,453 psi | 68% | 2503 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,971 psi | 61% | 2385 fps | 97.5% |
| IMR 4166 Enduron | <<locked>> | 82% | 43,076 psi | 69% | 2454 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 52,141 psi | 84% | 2516 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 46,586 psi | 75% | 2569 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 45,730 psi | 74% | 2530 fps | 95.6% |
| IMR 4831 | <<locked>> | 88% | 33,895 psi | 55% | 2375 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 39,320 psi | 63% | 2464 fps | 98.3% |
| IMR 8208 XBR | <<locked>> | 80% | 44,701 psi | 72% | 2507 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 50,647 psi | 82% | 2589 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,539 psi | 67% | 2477 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 42,917 psi | 69% | 2441 fps | 98.9% |
| Lovex S062 | <<locked>> | 80% | 37,942 psi | 61% | 2392 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 39,972 psi | 64% | 2434 fps | 95.7% |
| Lovex S070 | <<locked>> | 92% | 42,772 psi | 69% | 2507 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 41,974 psi | 68% | 2457 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 41,959 psi | 68% | 2461 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,782 psi | 61% | 2425 fps | 97.9% |
| Norma URP | <<locked>> | 86% | 33,446 psi | 54% | 2372 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 37,101 psi | 60% | 2431 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 94% | 42,221 psi | 68% | 2559 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 44,483 psi | 72% | 2510 fps | 97.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,801 psi | 71% | 2526 fps | 99% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,240 psi | 78% | 2552 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,672 psi | 43% | 1480 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,154 psi | 81% | 2582 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 41,611 psi | 67% | 2464 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,161 psi | 65% | 2533 fps | 98% |
| ReloadSwiss RS 60 | 31 gr | 80% | 32,619 psi | 53% | 2398 fps | 98.9% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 34,882 psi | 56% | 2434 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 37,898 psi | 61% | 2497 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 45,643 psi | 74% | 2490 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,668 psi | 64% | 2405 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 33,199 psi | 54% | 2326 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 92% | 46,717 psi | 75% | 2546 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 39,972 psi | 64% | 2434 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,539 psi | 67% | 2477 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 37,942 psi | 61% | 2392 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 92% | 42,772 psi | 69% | 2507 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,200 psi | 55% | 2375 fps | 96.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,902 psi | 69% | 2487 fps | 97.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,249 psi | 67% | 2470 fps | 98.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,323 psi | 70% | 2411 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,882 psi | 58% | 2287 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 44,643 psi | 72% | 2477 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 48,341 psi | 78% | 2582 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 43,004 psi | 69% | 2418 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,598 psi | 69% | 2484 fps | 98.7% |
| Somchem S355 | <<locked>> | 80% | 34,243 psi | 55% | 2336 fps | 97.4% |
| Somchem S365 | <<locked>> | 82% | 26,339 psi | 42% | 2221 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 48,921 psi | 79% | 2470 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,569 psi | 70% | 2408 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,131 psi | 63% | 2395 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,842 psi | 64% | 2405 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,445 psi | 52% | 2277 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 34,867 psi | 56% | 2372 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 44,614 psi | 72% | 2500 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 38,101 psi | 61% | 2388 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 34,229 psi | 55% | 2372 fps | 95% |
| Vihtavuori N555 | <<locked>> | 94% | 32,518 psi | 52% | 2405 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,935 psi | 47% | 2205 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 44,208 psi | 71% | 2546 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 43,511 psi | 70% | 2579 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 98% | 30,545 psi | 49% | 2405 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,451 psi | 65% | 2470 fps | 98.9% |
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 102 powders for .25 GT loaded with the .257 | 122gr | Remington SP Extended-Range. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,835 fps; across all powders the maximum-charge window runs from 1,617 fps to 2,835 fps. Accurate 4350 gives the best case fill at 100 %, and 102 of the 102 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (427 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 122.0 gr projectile in 0.257" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-23 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, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .25 GT with the .257 | 122gr | Remington SP Extended-Range 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.