Load Specifications
Load data in caliber .25 GT with .257 | 86gr | Winchester SPRN bullet and 84 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon CFE223, Alliant Power Pro 1200-R and Hodgdon H4895.
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 1680 | <<locked>> | 82% | 55,405 psi | 89% | 3005 fps | 100% |
| Accurate 2015 | <<locked>> | 94% | 54,868 psi | 88% | 3074 fps | 100% |
| Accurate 2200 | <<locked>> | 86% | 55,796 psi | 90% | 3163 fps | 97% |
| Accurate 2230 | <<locked>> | 84% | 52,576 psi | 85% | 3104 fps | 96.8% |
| Accurate 2460 | <<locked>> | 90% | 53,635 psi | 87% | 3091 fps | 99.8% |
| Accurate 2495ᴾ | <<locked>> | 100% | 54,273 psi | 88% | 3120 fps | 100% |
| Accurate 2520 | <<locked>> | 94% | 54,665 psi | 88% | 3146 fps | 99.7% |
| Accurate 4064ᴾ | <<locked>> | 100% | 50,256 psi | 81% | 3094 fps | 99.8% |
| Accurate LT-30 | <<locked>> | 86% | 52,605 psi | 85% | 2976 fps | 100% |
| Accurate LT-32 | <<locked>> | 86% | 53,011 psi | 86% | 2995 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 96% | 53,679 psi | 87% | 3136 fps | 97.5% |
| ADI AR 2207 | <<locked>> | 84% | 53,388 psi | 86% | 3012 fps | 100% |
| ADI AR 2208ᴾ | <<locked>> | 100% | 51,372 psi | 83% | 3064 fps | 96.3% |
| ADI AR 2219 | <<locked>> | 88% | 55,782 psi | 90% | 3150 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 94% | 53,461 psi | 86% | 3100 fps | 98.6% |
| Alliant AR-Comp | <<locked>> | 96% | 55,390 psi | 89% | 3156 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 90% | 54,389 psi | 88% | 3212 fps | 98.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 98% | 53,330 psi | 86% | 3225 fps | 96.3% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 49,879 psi | 80% | 3087 fps | 97.8% |
| Alliant Reloder-10x | <<locked>> | 90% | 54,824 psi | 88% | 3091 fps | 100% |
| Alliant Reloder-15ᴾ | <<locked>> | 100% | 54,331 psi | 88% | 3166 fps | 97.2% |
| Alliant Reloder-7 | <<locked>> | 84% | 55,013 psi | 89% | 3035 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 88% | 54,839 psi | 88% | 3015 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 96% | 53,447 psi | 86% | 3140 fps | 96.3% |
| Bofors RP3ᴾ | <<locked>> | 100% | 49,777 psi | 80% | 3097 fps | 97.8% |
| Hodgdon Benchmark | <<locked>> | 92% | 52,707 psi | 85% | 3041 fps | 98.9% |
| Hodgdon BL-C2 | <<locked>> | 96% | 55,608 psi | 90% | 3189 fps | 99.3% |
| Hodgdon CFE223 | <<locked>> | 92% | 53,330 psi | 86% | 3212 fps | 96.9% |
| Hodgdon H322 | <<locked>> | 90% | 54,273 psi | 88% | 3127 fps | 100% |
| Hodgdon H335 | <<locked>> | 90% | 55,535 psi | 90% | 3150 fps | 99.9% |
| Hodgdon H4198 | <<locked>> | 84% | 54,578 psi | 88% | 3031 fps | 100% |
| Hodgdon H4895 | <<locked>> | 96% | 54,085 psi | 87% | 3150 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 98% | 52,431 psi | 85% | 3173 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,562 psi | 54% | 1896 fps | 100% |
| Hodgdon VARGET | <<locked>> | 96% | 52,518 psi | 85% | 3100 fps | 97.8% |
| IMR 3031 | <<locked>> | 98% | 55,695 psi | 90% | 3205 fps | 100% |
| IMR 4064ᴾ | <<locked>> | 100% | 54,056 psi | 87% | 3104 fps | 97.1% |
| IMR 4198 | <<locked>> | 90% | 55,840 psi | 90% | 3061 fps | 100% |
| IMR 4895ᴾ | <<locked>> | 100% | 55,579 psi | 90% | 3202 fps | 98% |
| IMR 8208 XBR | <<locked>> | 94% | 53,461 psi | 86% | 3100 fps | 98.6% |
| Lovex D073.4 | <<locked>> | 84% | 53,461 psi | 86% | 3100 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 90% | 53,403 psi | 86% | 3091 fps | 99.2% |
| Lovex D073.6 | <<locked>> | 98% | 55,912 psi | 90% | 3176 fps | 99.8% |
| Lovex S060 | <<locked>> | 96% | 54,940 psi | 89% | 3074 fps | 97.7% |
| Lovex S062ᴾ | <<locked>> | 100% | 53,127 psi | 86% | 3107 fps | 98.6% |
| Norma 200 | <<locked>> | 86% | 54,897 psi | 89% | 3064 fps | 100% |
| Norma 201 | <<locked>> | 98% | 55,970 psi | 90% | 3140 fps | 98.9% |
| Norma 202 | <<locked>> | 96% | 52,388 psi | 84% | 3097 fps | 99.8% |
| Norma 203Bᴾ | <<locked>> | 100% | 53,316 psi | 86% | 3153 fps | 97.5% |
| Ramshot Big Gameᴾ | <<locked>> | 100% | 53,998 psi | 87% | 3173 fps | 97.4% |
| Ramshot Wild Boar | <<locked>> | 94% | 53,069 psi | 86% | 3127 fps | 97.4% |
| Ramshot X-Terminator | <<locked>> | 92% | 55,187 psi | 89% | 3100 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,518 psi | 54% | 1936 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 90% | 53,606 psi | 86% | 3104 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 98% | 53,983 psi | 87% | 3235 fps | 97.1% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 47,442 psi | 77% | 3133 fps | 98.8% |
| Rottweil R 901 | <<locked>> | 94% | 53,359 psi | 86% | 3084 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 98% | 52,866 psi | 85% | 3081 fps | 98.5% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 46,166 psi | 74% | 3018 fps | 96.8% |
| Shooters World AR Plus | <<locked>> | 84% | 53,461 psi | 86% | 3100 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 98% | 55,912 psi | 90% | 3176 fps | 99.8% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 53,127 psi | 86% | 3107 fps | 98.6% |
| Shooters World Tactical Rifle | <<locked>> | 88% | 53,896 psi | 87% | 3061 fps | 98.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 53,809 psi | 87% | 2749 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 86% | 52,692 psi | 85% | 3100 fps | 99.8% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 48,559 psi | 78% | 3084 fps | 96.3% |
| SNPE Vectan SP 3 | <<locked>> | 90% | 55,941 psi | 90% | 3114 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 98% | 55,956 psi | 90% | 3163 fps | 97.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 96% | 55,347 psi | 89% | 3051 fps | 99.9% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 51,053 psi | 82% | 2989 fps | 99.9% |
| Somchem S321 | <<locked>> | 92% | 54,636 psi | 88% | 3140 fps | 98.9% |
| Somchem S335 | <<locked>> | 96% | 54,128 psi | 87% | 3048 fps | 100% |
| Somchem S341 | <<locked>> | 96% | 54,795 psi | 88% | 3123 fps | 97.6% |
| Somchem S355ᴾ | <<locked>> | 100% | 47,384 psi | 76% | 3028 fps | 96.8% |
| Vihtavuori N120 | <<locked>> | 84% | 53,345 psi | 86% | 2956 fps | 100% |
| Vihtavuori N130 | <<locked>> | 92% | 55,187 psi | 89% | 3035 fps | 100% |
| Vihtavuori N133 | <<locked>> | 96% | 54,839 psi | 88% | 3041 fps | 100% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 54,346 psi | 88% | 3114 fps | 100% |
| Vihtavuori N140 | <<locked>> | 98% | 53,243 psi | 86% | 3081 fps | 99.9% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 45,687 psi | 74% | 2963 fps | 97.8% |
| Vihtavuori N530 | <<locked>> | 94% | 54,230 psi | 87% | 3107 fps | 98.7% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 54,824 psi | 88% | 3120 fps | 99.9% |
| Winchester 748 | <<locked>> | 94% | 52,417 psi | 85% | 3143 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 98% | 55,027 psi | 89% | 3166 fps | 98.3% |
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 1680 | <<locked>> | 80% | 51,779 psi | 84% | 2949 fps | 100% |
| Accurate 2015 | <<locked>> | 80% | 35,288 psi | 57% | 2713 fps | 99.1% |
| Accurate 2200 | <<locked>> | 82% | 48,907 psi | 79% | 3038 fps | 95.5% |
| Accurate 2230 | <<locked>> | 80% | 45,585 psi | 74% | 2976 fps | 95.1% |
| Accurate 2460 | <<locked>> | 80% | 38,130 psi | 61% | 2799 fps | 97.5% |
| Accurate 2495 | <<locked>> | 80% | 27,615 psi | 45% | 2572 fps | 97.4% |
| Accurate 2520 | <<locked>> | 80% | 33,446 psi | 54% | 2723 fps | 95.6% |
| Accurate 4064 | <<locked>> | 84% | 29,965 psi | 48% | 2651 fps | 95.5% |
| Accurate LT-30 | <<locked>> | 80% | 43,932 psi | 71% | 2825 fps | 99.5% |
| Accurate LT-32 | <<locked>> | 80% | 44,295 psi | 71% | 2838 fps | 98.4% |
| ADI AR 2206H | <<locked>> | 90% | 44,527 psi | 72% | 2963 fps | 95.5% |
| ADI AR 2207 | <<locked>> | 80% | 47,543 psi | 77% | 2920 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 48,414 psi | 78% | 3012 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 42,670 psi | 69% | 2923 fps | 99.3% |
| ADI Benchmark 8208 | <<locked>> | 84% | 39,073 psi | 63% | 2818 fps | 95.3% |
| Alliant AR-Comp | <<locked>> | 80% | 32,329 psi | 52% | 2730 fps | 99.9% |
| Alliant Power Pro 1200-R | 30.4 gr | 82% | 41,597 psi | 67% | 2963 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 50,227 psi | 81% | 3163 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 41,060 psi | 66% | 2913 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 40,234 psi | 65% | 2838 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 44,962 psi | 73% | 2992 fps | 95% |
| Alliant Reloder-7 | <<locked>> | 80% | 48,399 psi | 78% | 2930 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 42,409 psi | 68% | 2805 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 49,951 psi | 81% | 3077 fps | 95.5% |
| Bofors RP3 | <<locked>> | 94% | 40,756 psi | 66% | 2920 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 36,506 psi | 59% | 2713 fps | 95.2% |
| Hodgdon BL-C2 | <<locked>> | 84% | 36,550 psi | 59% | 2818 fps | 95.3% |
| Hodgdon CFE223 | 35.6 gr | 88% | 46,514 psi | 75% | 3081 fps | 95.3% |
| Hodgdon H322 | <<locked>> | 80% | 38,972 psi | 63% | 2844 fps | 98.7% |
| Hodgdon H335 | <<locked>> | 80% | 39,334 psi | 63% | 2851 fps | 98% |
| Hodgdon H4198 | <<locked>> | 80% | 48,385 psi | 78% | 2927 fps | 99.7% |
| Hodgdon H4895 | 32.7 gr | 88% | 42,177 psi | 68% | 2923 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 40,263 psi | 65% | 2927 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,816 psi | 40% | 1696 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 40,915 psi | 66% | 2874 fps | 95% |
| IMR 3031 | <<locked>> | 80% | 30,995 psi | 50% | 2703 fps | 97.4% |
| IMR 4064 | <<locked>> | 94% | 45,078 psi | 73% | 2943 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 41,249 psi | 67% | 2818 fps | 100% |
| IMR 4895 | <<locked>> | 92% | 42,917 psi | 69% | 2966 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 84% | 39,073 psi | 63% | 2818 fps | 95.3% |
| Lovex D073.4 | <<locked>> | 80% | 46,383 psi | 75% | 2979 fps | 98.6% |
| Lovex D073.5 | <<locked>> | 80% | 37,971 psi | 61% | 2795 fps | 96.2% |
| Lovex D073.6 | <<locked>> | 82% | 32,343 psi | 52% | 2707 fps | 95.1% |
| Lovex S060 | <<locked>> | 88% | 43,163 psi | 70% | 2858 fps | 95.1% |
| Lovex S062 | <<locked>> | 90% | 38,928 psi | 63% | 2835 fps | 95.5% |
| Norma 200 | <<locked>> | 80% | 45,368 psi | 73% | 2913 fps | 100% |
| Norma 201 | <<locked>> | 86% | 38,319 psi | 62% | 2802 fps | 95.2% |
| Norma 202 | <<locked>> | 80% | 31,517 psi | 51% | 2657 fps | 95.6% |
| Norma 203B | <<locked>> | 94% | 44,063 psi | 71% | 2979 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 94% | 44,382 psi | 72% | 2992 fps | 95.1% |
| Ramshot Wild Boar | <<locked>> | 88% | 43,250 psi | 70% | 2943 fps | 95% |
| Ramshot X-Terminator | <<locked>> | 86% | 45,658 psi | 74% | 2930 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,903 psi | 40% | 1736 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 38,667 psi | 62% | 2812 fps | 96.8% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 46,775 psi | 75% | 3100 fps | 95.4% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 36,535 psi | 59% | 2871 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 35,186 psi | 57% | 2713 fps | 96.6% |
| Rottweil R 902 | <<locked>> | 88% | 38,754 psi | 63% | 2805 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 96% | 40,263 psi | 65% | 2900 fps | 95.1% |
| Shooters World AR Plus | <<locked>> | 80% | 46,383 psi | 75% | 2979 fps | 98.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 32,343 psi | 52% | 2707 fps | 95.1% |
| Shooters World Precision | <<locked>> | 90% | 38,928 psi | 63% | 2835 fps | 95.5% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 40,785 psi | 66% | 2818 fps | 95.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 48,530 psi | 78% | 2674 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 42,960 psi | 69% | 2920 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 45,759 psi | 74% | 3028 fps | 95.6% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 40,886 psi | 66% | 2848 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 43,076 psi | 69% | 2927 fps | 95% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 33,692 psi | 54% | 2631 fps | 96.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 29,037 psi | 47% | 2523 fps | 95.8% |
| Somchem S321 | <<locked>> | 82% | 38,827 psi | 63% | 2835 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 32,924 psi | 53% | 2628 fps | 97% |
| Somchem S341 | <<locked>> | 90% | 44,527 psi | 72% | 2940 fps | 95.3% |
| Somchem S355 | <<locked>> | 96% | 41,916 psi | 68% | 2920 fps | 95.4% |
| Vihtavuori N120 | <<locked>> | 80% | 47,543 psi | 77% | 2871 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 38,334 psi | 62% | 2740 fps | 99.9% |
| Vihtavuori N133 | <<locked>> | 80% | 33,562 psi | 54% | 2644 fps | 98.7% |
| Vihtavuori N135 | <<locked>> | 80% | 28,543 psi | 46% | 2592 fps | 97.5% |
| Vihtavuori N140 | <<locked>> | 80% | 29,849 psi | 48% | 2592 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 94% | 37,492 psi | 60% | 2795 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 84% | 38,827 psi | 63% | 2808 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 82% | 30,574 psi | 49% | 2621 fps | 95% |
| Winchester 748 | <<locked>> | 82% | 35,157 psi | 57% | 2785 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 90% | 42,047 psi | 68% | 2927 fps | 95.5% |
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 98 powders for .25 GT loaded with the .257 | 86gr | Winchester SPRN. ReloadSwiss RS 52 delivers the highest muzzle velocity at 3,235 fps; across all powders the maximum-charge window runs from 1,896 fps to 3,235 fps. Accurate 2495 gives the best case fill at 100 %, and 98 of the 98 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (427 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 86.0 gr projectile in 0.257" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 2495, Accurate 4064, ADI AR 2208 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. Hodgdon CFE223, Alliant Power Pro 1200-R, Hodgdon H4895 rank at the top here: for .25 GT with the .257 | 86gr | Winchester SPRN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Hodgdon Hybrid 100V, IMR 4166 Enduron 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.