Load Specifications
Load data in caliber .25 GT with .257 | 100gr | Impala RNFP KO bullet and 84 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, Hodgdon CFE223 and ReloadSwiss RS 52.
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% | 53,490 psi | 86% | 2808 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 55,390 psi | 89% | 2877 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 54,810 psi | 88% | 2874 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 53,011 psi | 86% | 2881 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 54,143 psi | 87% | 2910 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 45,585 psi | 74% | 2835 fps | 96% |
| Accurate LT-30 | <<locked>> | 84% | 55,753 psi | 90% | 2789 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 52,953 psi | 85% | 2766 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 92% | 55,143 psi | 89% | 2930 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 98% | 55,579 psi | 90% | 2913 fps | 98.4% |
| ADI AR 2219 | <<locked>> | 82% | 53,069 psi | 86% | 2867 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 54,476 psi | 88% | 2887 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 90% | 53,693 psi | 87% | 2877 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 55,666 psi | 90% | 2989 fps | 99.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 54,012 psi | 87% | 3022 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 55,129 psi | 89% | 2943 fps | 99.4% |
| Alliant Reloder-10x | <<locked>> | 84% | 53,142 psi | 86% | 2815 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 55,796 psi | 90% | 2959 fps | 98.6% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 51,822 psi | 84% | 2986 fps | 98.9% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 54,853 psi | 88% | 2785 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 54,360 psi | 88% | 2930 fps | 97.9% |
| Bofors RP3 | <<locked>> | 98% | 55,622 psi | 90% | 2956 fps | 99.5% |
| Hodgdon Benchmark | <<locked>> | 88% | 53,577 psi | 86% | 2828 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 90% | 53,200 psi | 86% | 2917 fps | 99.7% |
| Hodgdon CFE223 | <<locked>> | 88% | 54,360 psi | 88% | 2999 fps | 98.4% |
| Hodgdon H322 | <<locked>> | 86% | 54,911 psi | 89% | 2894 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 52,750 psi | 85% | 2871 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 53,824 psi | 87% | 2910 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 92% | 55,593 psi | 90% | 2940 fps | 99.3% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,829 psi | 67% | 2720 fps | 96.7% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 53,621 psi | 86% | 2963 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,838 psi | 56% | 1755 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 53,476 psi | 86% | 2890 fps | 99% |
| IMR 3031 | <<locked>> | 92% | 54,520 psi | 88% | 2936 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 55,187 psi | 89% | 2900 fps | 98.5% |
| IMR 4198 | <<locked>> | 86% | 55,782 psi | 90% | 2812 fps | 100% |
| IMR 4895 | <<locked>> | 94% | 53,882 psi | 87% | 2943 fps | 98.8% |
| IMR 8208 XBR | <<locked>> | 90% | 54,476 psi | 88% | 2887 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 86% | 55,274 psi | 89% | 2884 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 92% | 54,375 psi | 88% | 2913 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 55,317 psi | 89% | 2858 fps | 98.9% |
| Lovex S062 | <<locked>> | 96% | 55,100 psi | 89% | 2907 fps | 99.6% |
| Norma 201 | <<locked>> | 92% | 54,505 psi | 88% | 2884 fps | 99.5% |
| Norma 202 | <<locked>> | 92% | 54,447 psi | 88% | 2894 fps | 100% |
| Norma 203B | <<locked>> | 96% | 54,926 psi | 89% | 2946 fps | 98.9% |
| Norma URPᴾ | <<locked>> | 100% | 45,513 psi | 73% | 2825 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 96% | 55,230 psi | 89% | 2969 fps | 98.8% |
| Ramshot TAC | <<locked>> | 90% | 54,911 psi | 89% | 2890 fps | 96.6% |
| Ramshot Wild Boar | <<locked>> | 90% | 53,925 psi | 87% | 2913 fps | 98.7% |
| Ramshot X-Terminator | <<locked>> | 88% | 55,912 psi | 90% | 2887 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,505 psi | 57% | 1801 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 53,969 psi | 87% | 2874 fps | 99.9% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 55,288 psi | 89% | 3022 fps | 98.6% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 55,187 psi | 89% | 3054 fps | 100% |
| Rottweil R 901 | <<locked>> | 88% | 53,171 psi | 86% | 2835 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 54,650 psi | 88% | 2874 fps | 99.5% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 55,463 psi | 89% | 2946 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 92% | 54,375 psi | 88% | 2913 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 55,100 psi | 89% | 2907 fps | 99.6% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 54,259 psi | 88% | 2841 fps | 99.3% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 53,330 psi | 86% | 2871 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 53,272 psi | 86% | 2949 fps | 98.6% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 53,606 psi | 86% | 2831 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 52,997 psi | 85% | 2864 fps | 96.8% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 53,461 psi | 86% | 2897 fps | 98.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 52,910 psi | 85% | 2782 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 55,187 psi | 89% | 2818 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 55,898 psi | 90% | 2927 fps | 99.7% |
| Somchem S335 | <<locked>> | 92% | 55,506 psi | 90% | 2831 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 55,724 psi | 90% | 2913 fps | 98.8% |
| Somchem S355ᴾ | <<locked>> | 100% | 55,854 psi | 90% | 2943 fps | 99.3% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,843 psi | 66% | 2772 fps | 98% |
| Vihtavuori N130 | <<locked>> | 88% | 55,825 psi | 90% | 2802 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 55,811 psi | 90% | 2815 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 53,345 psi | 86% | 2854 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 54,810 psi | 88% | 2867 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 53,983 psi | 87% | 2877 fps | 99.7% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 47,834 psi | 77% | 2825 fps | 96.2% |
| Vihtavuori N530 | <<locked>> | 90% | 54,882 psi | 89% | 2884 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 94% | 53,098 psi | 86% | 2864 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,079 psi | 76% | 2831 fps | 95.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,008 psi | 79% | 2808 fps | 98.4% |
| Winchester 748 | <<locked>> | 90% | 53,809 psi | 87% | 2930 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 92% | 52,910 psi | 85% | 2904 fps | 99% |
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% | 42,206 psi | 68% | 2625 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 45,716 psi | 74% | 2720 fps | 99.7% |
| Accurate 2495 | <<locked>> | 80% | 36,013 psi | 58% | 2552 fps | 99.9% |
| Accurate 2520 | <<locked>> | 80% | 40,741 psi | 66% | 2667 fps | 98.9% |
| Accurate 4064 | <<locked>> | 80% | 34,011 psi | 55% | 2530 fps | 98.3% |
| Accurate 4350 | <<locked>> | 98% | 42,757 psi | 69% | 2779 fps | 95.2% |
| Accurate LT-30 | <<locked>> | 80% | 49,647 psi | 80% | 2697 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,951 psi | 81% | 2717 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 80% | 38,711 psi | 62% | 2618 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 88% | 41,568 psi | 67% | 2661 fps | 95.4% |
| ADI AR 2219 | <<locked>> | 80% | 49,501 psi | 80% | 2812 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,509 psi | 65% | 2635 fps | 97.3% |
| Alliant AR-Comp | <<locked>> | 80% | 39,073 psi | 63% | 2644 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 46,412 psi | 75% | 2831 fps | 98.1% |
| Alliant Power Pro 2000-MR | 33 gr | 86% | 42,119 psi | 68% | 2785 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 34,113 psi | 55% | 2536 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 47,572 psi | 77% | 2730 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 41,452 psi | 67% | 2700 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 90% | 38,218 psi | 62% | 2703 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,718 psi | 79% | 2697 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 42,206 psi | 68% | 2710 fps | 95.1% |
| Bofors RP3 | <<locked>> | 82% | 33,852 psi | 55% | 2539 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,308 psi | 68% | 2628 fps | 98.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,798 psi | 63% | 2651 fps | 97.5% |
| Hodgdon CFE223 | 31.4 gr | 80% | 41,959 psi | 68% | 2766 fps | 95.7% |
| Hodgdon H322 | <<locked>> | 80% | 45,803 psi | 74% | 2749 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 46,543 psi | 75% | 2769 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 90% | 44,701 psi | 72% | 2749 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 39,001 psi | 63% | 2631 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 37,217 psi | 60% | 2618 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,911 psi | 56% | 2585 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,136 psi | 42% | 1572 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,333 psi | 60% | 2579 fps | 95.6% |
| IMR 3031 | <<locked>> | 80% | 37,565 psi | 61% | 2641 fps | 99.8% |
| IMR 4064 | <<locked>> | 86% | 41,162 psi | 66% | 2648 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 47,282 psi | 76% | 2687 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 37,695 psi | 61% | 2628 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 40,509 psi | 65% | 2635 fps | 97.3% |
| Lovex D073.5 | <<locked>> | 80% | 45,643 psi | 74% | 2726 fps | 99.1% |
| Lovex D073.6 | <<locked>> | 80% | 37,347 psi | 60% | 2608 fps | 98.2% |
| Lovex S060 | <<locked>> | 80% | 39,305 psi | 63% | 2562 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 34,708 psi | 56% | 2513 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 38,522 psi | 62% | 2585 fps | 96.9% |
| Norma 202 | <<locked>> | 80% | 37,971 psi | 61% | 2595 fps | 98.8% |
| Norma 203B | <<locked>> | 84% | 38,406 psi | 62% | 2638 fps | 95.4% |
| Norma URP | <<locked>> | 98% | 42,888 psi | 69% | 2772 fps | 95% |
| Ramshot Big Game | <<locked>> | 86% | 40,451 psi | 65% | 2700 fps | 95.7% |
| Ramshot TAC | <<locked>> | 86% | 48,733 psi | 79% | 2785 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,479 psi | 64% | 2644 fps | 95.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,671 psi | 70% | 2674 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,440 psi | 43% | 1611 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,947 psi | 72% | 2720 fps | 99.2% |
| ReloadSwiss RS 52 | 31.2 gr | 84% | 40,234 psi | 65% | 2740 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 31,691 psi | 51% | 2539 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 42,351 psi | 68% | 2641 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 80% | 36,521 psi | 59% | 2533 fps | 96.3% |
| Rottweil R 903 | <<locked>> | 86% | 36,129 psi | 58% | 2589 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,347 psi | 60% | 2608 fps | 98.2% |
| Shooters World Precision | <<locked>> | 80% | 34,708 psi | 56% | 2513 fps | 95.7% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,776 psi | 77% | 2736 fps | 98.5% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 50,415 psi | 81% | 2825 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 39,363 psi | 63% | 2684 fps | 95.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,413 psi | 76% | 2736 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 46,775 psi | 75% | 2756 fps | 95.4% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 39,552 psi | 64% | 2635 fps | 95.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,552 psi | 64% | 2549 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,634 psi | 53% | 2411 fps | 98.5% |
| Somchem S321 | <<locked>> | 80% | 43,410 psi | 70% | 2713 fps | 98.3% |
| Somchem S335 | <<locked>> | 80% | 39,494 psi | 64% | 2562 fps | 99.5% |
| Somchem S341 | <<locked>> | 80% | 38,029 psi | 61% | 2592 fps | 95.1% |
| Somchem S355 | <<locked>> | 86% | 37,246 psi | 60% | 2595 fps | 95.6% |
| Somchem S365 | <<locked>> | 94% | 34,142 psi | 55% | 2608 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 44,541 psi | 72% | 2628 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,465 psi | 64% | 2552 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,099 psi | 57% | 2533 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 80% | 35,984 psi | 58% | 2533 fps | 98.7% |
| Vihtavuori N150 | <<locked>> | 82% | 31,328 psi | 51% | 2434 fps | 95% |
| Vihtavuori N160 | <<locked>> | 98% | 45,121 psi | 73% | 2772 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 40,379 psi | 65% | 2628 fps | 97.4% |
| Vihtavuori N540 | <<locked>> | 80% | 34,679 psi | 56% | 2516 fps | 98% |
| Vihtavuori N550 | <<locked>> | 98% | 44,034 psi | 71% | 2776 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 38,218 psi | 62% | 2595 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 38,986 psi | 63% | 2664 fps | 97.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,056 psi | 58% | 2579 fps | 95.3% |
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 84 powders for .25 GT loaded with the .257 | 100gr | Impala RNFP KO. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,054 fps; across all powders the maximum-charge window runs from 1,755 fps to 3,054 fps. Accurate 4350 gives the best case fill at 100 %, and 84 of the 84 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 100.0 gr projectile in 0.257" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-17, Hodgdon Hybrid 100V 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, Hodgdon CFE223, ReloadSwiss RS 52 rank at the top here: for .25 GT with the .257 | 100gr | Impala RNFP KO 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.