Load Specifications
Load data in caliber .25 GT with .257 | 100gr | Barnes X BT bullet and 85 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 Hodgdon CFE223.
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% | 53,156 psi | 86% | 2802 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 56,014 psi | 90% | 2933 fps | 98.3% |
| Accurate 2460 | <<locked>> | 86% | 55,056 psi | 89% | 2871 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 54,491 psi | 88% | 2871 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 52,707 psi | 85% | 2877 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 53,925 psi | 87% | 2904 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 45,310 psi | 73% | 2828 fps | 95.9% |
| Accurate LT-30 | <<locked>> | 84% | 55,970 psi | 90% | 2792 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 53,127 psi | 86% | 2766 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 54,868 psi | 88% | 2923 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 98% | 55,753 psi | 90% | 2917 fps | 98.4% |
| ADI AR 2219 | <<locked>> | 82% | 52,750 psi | 85% | 2861 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 54,201 psi | 87% | 2884 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 90% | 53,853 psi | 87% | 2881 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 55,825 psi | 90% | 2992 fps | 99.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 54,143 psi | 87% | 3022 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 54,868 psi | 88% | 2940 fps | 99.4% |
| Alliant Reloder-10x | <<locked>> | 86% | 56,014 psi | 90% | 2854 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 55,985 psi | 90% | 2959 fps | 98.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 45,397 psi | 73% | 2828 fps | 95.8% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 51,982 psi | 84% | 2989 fps | 98.9% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 54,984 psi | 89% | 2789 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 54,534 psi | 88% | 2933 fps | 97.9% |
| Bofors RP3 | <<locked>> | 98% | 55,738 psi | 90% | 2959 fps | 99.5% |
| Hodgdon Benchmark | <<locked>> | 88% | 53,301 psi | 86% | 2825 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 90% | 52,924 psi | 85% | 2910 fps | 99.7% |
| Hodgdon CFE223 | <<locked>> | 88% | 54,520 psi | 88% | 3002 fps | 98.5% |
| Hodgdon H322 | <<locked>> | 86% | 55,056 psi | 89% | 2894 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 56,057 psi | 90% | 2920 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 53,563 psi | 86% | 2907 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 92% | 55,259 psi | 89% | 2936 fps | 99.2% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,611 psi | 67% | 2717 fps | 96.6% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 53,737 psi | 87% | 2966 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,925 psi | 56% | 1755 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 53,156 psi | 86% | 2884 fps | 99% |
| IMR 3031 | <<locked>> | 92% | 54,201 psi | 87% | 2930 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 55,361 psi | 89% | 2900 fps | 98.5% |
| IMR 4198 | <<locked>> | 86% | 55,999 psi | 90% | 2815 fps | 100% |
| IMR 4895 | <<locked>> | 94% | 54,070 psi | 87% | 2943 fps | 98.8% |
| IMR 8208 XBR | <<locked>> | 90% | 54,201 psi | 87% | 2884 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 86% | 54,969 psi | 89% | 2877 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 92% | 54,462 psi | 88% | 2913 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 55,042 psi | 89% | 2851 fps | 98.8% |
| Lovex S062 | <<locked>> | 96% | 54,810 psi | 88% | 2900 fps | 99.6% |
| Norma 201 | <<locked>> | 92% | 54,201 psi | 87% | 2877 fps | 99.5% |
| Norma 202 | <<locked>> | 92% | 54,157 psi | 87% | 2887 fps | 100% |
| Norma 203B | <<locked>> | 96% | 55,114 psi | 89% | 2949 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 96% | 54,998 psi | 89% | 2966 fps | 98.8% |
| Ramshot TAC | <<locked>> | 90% | 55,100 psi | 89% | 2890 fps | 96.6% |
| Ramshot Wild Boar | <<locked>> | 90% | 53,621 psi | 86% | 2910 fps | 98.6% |
| Ramshot X-Terminator | <<locked>> | 88% | 55,550 psi | 90% | 2881 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,157 psi | 57% | 1795 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 54,114 psi | 87% | 2874 fps | 99.9% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 55,477 psi | 89% | 3025 fps | 98.6% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 55,390 psi | 89% | 3058 fps | 100% |
| Rottweil R 901 | <<locked>> | 90% | 55,927 psi | 90% | 2877 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 54,853 psi | 88% | 2877 fps | 99.5% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 55,027 psi | 89% | 2940 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 92% | 54,462 psi | 88% | 2913 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 54,810 psi | 88% | 2900 fps | 99.6% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 53,867 psi | 87% | 2835 fps | 99.2% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 53,490 psi | 86% | 2874 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 52,924 psi | 85% | 2943 fps | 98.5% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 53,316 psi | 86% | 2825 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 53,200 psi | 86% | 2864 fps | 96.8% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 53,214 psi | 86% | 2894 fps | 98.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 55,912 psi | 90% | 2825 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 55,347 psi | 89% | 2818 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 55,622 psi | 90% | 2923 fps | 99.7% |
| Somchem S335 | <<locked>> | 92% | 55,158 psi | 89% | 2828 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 55,854 psi | 90% | 2917 fps | 98.8% |
| Somchem S355ᴾ | <<locked>> | 100% | 55,579 psi | 90% | 2936 fps | 99.2% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,625 psi | 66% | 2769 fps | 97.9% |
| Vihtavuori N130 | <<locked>> | 88% | 55,970 psi | 90% | 2802 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 55,521 psi | 90% | 2812 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 53,026 psi | 86% | 2848 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 54,418 psi | 88% | 2861 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 53,722 psi | 87% | 2871 fps | 99.7% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 47,616 psi | 77% | 2818 fps | 96.1% |
| Vihtavuori N530 | <<locked>> | 90% | 55,056 psi | 89% | 2887 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 96% | 55,941 psi | 90% | 2904 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 46,746 psi | 75% | 2828 fps | 95.8% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,168 psi | 79% | 2812 fps | 98.4% |
| Winchester 748 | <<locked>> | 90% | 53,534 psi | 86% | 2927 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 92% | 52,649 psi | 85% | 2900 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% | 42,337 psi | 68% | 2625 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 52,765 psi | 85% | 2877 fps | 97.8% |
| Accurate 2460 | <<locked>> | 80% | 45,832 psi | 74% | 2723 fps | 99.7% |
| Accurate 2495 | <<locked>> | 80% | 35,839 psi | 58% | 2549 fps | 99.9% |
| Accurate 2520 | <<locked>> | 80% | 40,843 psi | 66% | 2667 fps | 98.9% |
| Accurate 4064 | <<locked>> | 80% | 33,779 psi | 54% | 2526 fps | 98.3% |
| Accurate 4350 | <<locked>> | 98% | 42,482 psi | 69% | 2776 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 49,763 psi | 80% | 2700 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 50,067 psi | 81% | 2717 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 80% | 38,522 psi | 62% | 2612 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 88% | 41,684 psi | 67% | 2664 fps | 95.5% |
| ADI AR 2219 | <<locked>> | 80% | 49,647 psi | 80% | 2812 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,248 psi | 65% | 2628 fps | 97.3% |
| Alliant AR-Comp | <<locked>> | 80% | 39,204 psi | 63% | 2648 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 46,079 psi | 74% | 2825 fps | 98% |
| Alliant Power Pro 2000-MR | 33.7 gr | 88% | 44,715 psi | 72% | 2841 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 34,229 psi | 55% | 2539 fps | 95.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 47,268 psi | 76% | 2723 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 41,495 psi | 67% | 2700 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 98% | 42,946 psi | 69% | 2776 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 90% | 38,014 psi | 61% | 2697 fps | 95.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,443 psi | 78% | 2690 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 42,337 psi | 68% | 2713 fps | 95.2% |
| Bofors RP3 | <<locked>> | 82% | 33,953 psi | 55% | 2543 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,424 psi | 68% | 2631 fps | 98.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,537 psi | 62% | 2644 fps | 97.5% |
| Hodgdon CFE223 | 31.3 gr | 80% | 41,713 psi | 67% | 2762 fps | 95.7% |
| Hodgdon H322 | <<locked>> | 80% | 45,498 psi | 73% | 2743 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 46,267 psi | 75% | 2762 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 92% | 47,485 psi | 77% | 2802 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 38,725 psi | 62% | 2625 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 37,318 psi | 60% | 2618 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,766 psi | 56% | 2582 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,179 psi | 42% | 1572 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,115 psi | 60% | 2572 fps | 95.5% |
| IMR 3031 | <<locked>> | 80% | 37,594 psi | 61% | 2641 fps | 99.8% |
| IMR 4064 | <<locked>> | 86% | 41,292 psi | 67% | 2648 fps | 95.7% |
| IMR 4198 | <<locked>> | 80% | 47,471 psi | 77% | 2687 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 37,739 psi | 61% | 2631 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 40,248 psi | 65% | 2628 fps | 97.3% |
| Lovex D073.5 | <<locked>> | 80% | 45,382 psi | 73% | 2720 fps | 99% |
| Lovex D073.6 | <<locked>> | 80% | 37,130 psi | 60% | 2602 fps | 98.1% |
| Lovex S060 | <<locked>> | 80% | 39,407 psi | 64% | 2562 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 34,751 psi | 56% | 2516 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 38,348 psi | 62% | 2582 fps | 96.8% |
| Norma 202 | <<locked>> | 80% | 38,000 psi | 61% | 2598 fps | 98.9% |
| Norma 203B | <<locked>> | 84% | 38,537 psi | 62% | 2641 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 86% | 40,234 psi | 65% | 2694 fps | 95.6% |
| Ramshot TAC | <<locked>> | 86% | 48,501 psi | 78% | 2779 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,233 psi | 63% | 2641 fps | 95.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,714 psi | 71% | 2677 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,513 psi | 43% | 1611 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,078 psi | 73% | 2720 fps | 99.2% |
| ReloadSwiss RS 52 | 31.2 gr | 84% | 40,277 psi | 65% | 2740 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 31,778 psi | 51% | 2539 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 42,424 psi | 68% | 2644 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 80% | 36,666 psi | 59% | 2533 fps | 96.3% |
| Rottweil R 903 | <<locked>> | 86% | 36,187 psi | 58% | 2589 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,130 psi | 60% | 2602 fps | 98.1% |
| Shooters World Precision | <<locked>> | 80% | 34,751 psi | 56% | 2516 fps | 95.7% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,500 psi | 77% | 2730 fps | 98.4% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 50,125 psi | 81% | 2822 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 39,146 psi | 63% | 2677 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,529 psi | 77% | 2736 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 46,514 psi | 75% | 2749 fps | 95.3% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 39,305 psi | 63% | 2631 fps | 95.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,682 psi | 64% | 2549 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,750 psi | 53% | 2415 fps | 98.5% |
| Somchem S321 | <<locked>> | 80% | 43,134 psi | 70% | 2707 fps | 98.2% |
| Somchem S335 | <<locked>> | 80% | 39,247 psi | 63% | 2556 fps | 99.5% |
| Somchem S341 | <<locked>> | 80% | 37,797 psi | 61% | 2589 fps | 95% |
| Somchem S355 | <<locked>> | 86% | 36,970 psi | 60% | 2592 fps | 95.5% |
| Somchem S365 | <<locked>> | 94% | 34,287 psi | 55% | 2612 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 44,672 psi | 72% | 2631 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,494 psi | 64% | 2552 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,215 psi | 57% | 2536 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 80% | 35,752 psi | 58% | 2526 fps | 98.7% |
| Vihtavuori N150 | <<locked>> | 84% | 32,996 psi | 53% | 2477 fps | 95.7% |
| Vihtavuori N160 | <<locked>> | 98% | 44,904 psi | 72% | 2769 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 40,103 psi | 65% | 2621 fps | 97.3% |
| Vihtavuori N540 | <<locked>> | 80% | 34,722 psi | 56% | 2516 fps | 98% |
| Vihtavuori N550 | <<locked>> | 98% | 44,106 psi | 71% | 2776 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 38,377 psi | 62% | 2598 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 39,102 psi | 63% | 2664 fps | 97.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,172 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 85 powders for .25 GT loaded with the .257 | 100gr | Barnes X BT. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,058 fps; across all powders the maximum-charge window runs from 1,755 fps to 3,058 fps. Accurate 4350 gives the best case fill at 100 %, and 85 of the 85 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-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, Hodgdon CFE223 rank at the top here: for .25 GT with the .257 | 100gr | Barnes X BT 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.