Load Specifications
Load data in caliber .25 GT with .257 | 87gr | Speer Hot-Cor bullet and 87 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 52, Alliant Power Pro 2000-MR 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.
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>> | 92% | 53,722 psi | 87% | 3054 fps | 100% |
| Accurate 2200 | <<locked>> | 84% | 54,607 psi | 88% | 3146 fps | 97.2% |
| Accurate 2230 | <<locked>> | 84% | 55,622 psi | 90% | 3159 fps | 97.7% |
| Accurate 2460 | <<locked>> | 90% | 56,028 psi | 90% | 3123 fps | 100% |
| Accurate 2495 | <<locked>> | 98% | 53,983 psi | 87% | 3110 fps | 100% |
| Accurate 2520 | <<locked>> | 92% | 53,693 psi | 87% | 3130 fps | 99.8% |
| Accurate 4064ᴾ | <<locked>> | 100% | 53,200 psi | 86% | 3136 fps | 100% |
| Accurate LT-30 | <<locked>> | 86% | 54,549 psi | 88% | 3009 fps | 100% |
| Accurate LT-32 | <<locked>> | 86% | 54,955 psi | 89% | 3028 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 94% | 52,750 psi | 85% | 3120 fps | 97.8% |
| ADI AR 2207 | <<locked>> | 84% | 55,854 psi | 90% | 3041 fps | 100% |
| ADI AR 2208ᴾ | <<locked>> | 100% | 53,824 psi | 87% | 3110 fps | 97.2% |
| ADI AR 2219 | <<locked>> | 86% | 54,462 psi | 88% | 3130 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 94% | 55,695 psi | 90% | 3140 fps | 99.1% |
| Alliant AR-Comp | <<locked>> | 94% | 54,766 psi | 88% | 3140 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 88% | 53,330 psi | 86% | 3196 fps | 98.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 98% | 55,999 psi | 90% | 3281 fps | 97.4% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 52,460 psi | 85% | 3130 fps | 98.5% |
| Alliant Reloder-10x | <<locked>> | 88% | 53,838 psi | 87% | 3074 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 98% | 53,766 psi | 87% | 3156 fps | 97.5% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 46,702 psi | 75% | 3104 fps | 96.8% |
| Alliant Reloder-7 | <<locked>> | 82% | 53,592 psi | 86% | 3009 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 53,867 psi | 87% | 3002 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 52,678 psi | 85% | 3130 fps | 96.6% |
| Bofors RP3ᴾ | <<locked>> | 100% | 52,939 psi | 85% | 3150 fps | 98.7% |
| Hodgdon Benchmark | <<locked>> | 92% | 54,839 psi | 88% | 3077 fps | 99.3% |
| Hodgdon BL-C2 | <<locked>> | 94% | 54,418 psi | 88% | 3169 fps | 99.4% |
| Hodgdon CFE223 | <<locked>> | 90% | 52,344 psi | 84% | 3196 fps | 97.2% |
| Hodgdon H322 | <<locked>> | 88% | 53,098 psi | 86% | 3107 fps | 100% |
| Hodgdon H335 | <<locked>> | 88% | 54,114 psi | 87% | 3127 fps | 99.9% |
| Hodgdon H380ᴾ | <<locked>> | 100% | 54,969 psi | 89% | 3156 fps | 96.3% |
| Hodgdon H4198 | <<locked>> | 82% | 53,505 psi | 86% | 3015 fps | 100% |
| Hodgdon H4895 | <<locked>> | 94% | 53,127 psi | 86% | 3133 fps | 98.3% |
| Hodgdon LEVERevolution | <<locked>> | 98% | 54,926 psi | 89% | 3215 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,040 psi | 55% | 1909 fps | 100% |
| Hodgdon VARGET | <<locked>> | 96% | 55,100 psi | 89% | 3146 fps | 98.5% |
| IMR 3031 | <<locked>> | 96% | 55,463 psi | 89% | 3196 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 53,447 psi | 86% | 3097 fps | 97.4% |
| IMR 4198 | <<locked>> | 88% | 54,360 psi | 88% | 3035 fps | 100% |
| IMR 4895 | <<locked>> | 98% | 55,013 psi | 89% | 3196 fps | 98.2% |
| IMR 8208 XBR | <<locked>> | 94% | 55,695 psi | 90% | 3140 fps | 99.1% |
| Lovex D073.4 | <<locked>> | 84% | 56,086 psi | 90% | 3140 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 88% | 52,518 psi | 85% | 3074 fps | 99.3% |
| Lovex D073.6 | <<locked>> | 96% | 54,911 psi | 89% | 3156 fps | 99.8% |
| Lovex S060 | <<locked>> | 94% | 53,882 psi | 87% | 3058 fps | 97.9% |
| Lovex S062ᴾ | <<locked>> | 100% | 55,782 psi | 90% | 3153 fps | 99.2% |
| Norma 200 | <<locked>> | 84% | 53,954 psi | 87% | 3048 fps | 100% |
| Norma 201 | <<locked>> | 96% | 54,955 psi | 89% | 3127 fps | 99.1% |
| Norma 202 | <<locked>> | 96% | 55,230 psi | 89% | 3143 fps | 100% |
| Norma 203Bᴾ | <<locked>> | 100% | 55,970 psi | 90% | 3196 fps | 98.3% |
| Ramshot Big Game | <<locked>> | 98% | 53,113 psi | 86% | 3163 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 94% | 55,564 psi | 90% | 3169 fps | 98.2% |
| Ramshot X-Terminator | <<locked>> | 90% | 54,056 psi | 87% | 3084 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,011 psi | 55% | 1952 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 90% | 55,956 psi | 90% | 3140 fps | 99.8% |
| ReloadSwiss RS 52 | <<locked>> | 96% | 52,953 psi | 85% | 3219 fps | 97.3% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 49,893 psi | 80% | 3189 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 94% | 55,869 psi | 90% | 3123 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 98% | 55,114 psi | 89% | 3117 fps | 99.1% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 48,747 psi | 79% | 3064 fps | 97.7% |
| Shooters World AR Plus | <<locked>> | 84% | 56,086 psi | 90% | 3140 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 96% | 54,911 psi | 89% | 3156 fps | 99.8% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 55,782 psi | 90% | 3153 fps | 99.2% |
| Shooters World Tactical Rifle | <<locked>> | 88% | 56,086 psi | 90% | 3100 fps | 98.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 55,303 psi | 89% | 2766 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 86% | 54,984 psi | 89% | 3136 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 51,155 psi | 83% | 3136 fps | 97.4% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 54,897 psi | 89% | 3094 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 94% | 54,737 psi | 88% | 3114 fps | 96% |
| SNPE Vectan SP 9 | <<locked>> | 96% | 54,766 psi | 88% | 3146 fps | 98.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 54,404 psi | 88% | 3038 fps | 99.9% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 53,171 psi | 86% | 3018 fps | 100% |
| Somchem S321 | <<locked>> | 90% | 53,577 psi | 86% | 3123 fps | 99.1% |
| Somchem S335 | <<locked>> | 94% | 52,823 psi | 85% | 3025 fps | 100% |
| Somchem S341 | <<locked>> | 94% | 53,940 psi | 87% | 3114 fps | 97.8% |
| Somchem S355ᴾ | <<locked>> | 100% | 49,893 psi | 80% | 3074 fps | 97.7% |
| Vihtavuori N120 | <<locked>> | 84% | 55,738 psi | 90% | 2986 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 53,998 psi | 87% | 3015 fps | 100% |
| Vihtavuori N133 | <<locked>> | 94% | 54,012 psi | 87% | 3028 fps | 100% |
| Vihtavuori N135 | <<locked>> | 98% | 53,548 psi | 86% | 3097 fps | 100% |
| Vihtavuori N140 | <<locked>> | 98% | 55,956 psi | 90% | 3120 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 48,109 psi | 78% | 3005 fps | 98.5% |
| Vihtavuori N530 | <<locked>> | 92% | 52,779 psi | 85% | 3081 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 98% | 54,056 psi | 87% | 3110 fps | 99.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 44,440 psi | 72% | 2927 fps | 96.2% |
| Winchester 748 | <<locked>> | 94% | 55,158 psi | 89% | 3186 fps | 99.6% |
| Winchester StaBALL Match | <<locked>> | 96% | 54,244 psi | 87% | 3153 fps | 98.5% |
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% | 36,869 psi | 59% | 2746 fps | 99.5% |
| Accurate 2200 | <<locked>> | 80% | 47,645 psi | 77% | 3015 fps | 95.7% |
| Accurate 2230 | <<locked>> | 80% | 48,022 psi | 77% | 3025 fps | 96.2% |
| Accurate 2460 | <<locked>> | 80% | 39,987 psi | 64% | 2838 fps | 98.3% |
| Accurate 2495 | <<locked>> | 80% | 29,472 psi | 48% | 2618 fps | 98.3% |
| Accurate 2520 | <<locked>> | 80% | 35,244 psi | 57% | 2766 fps | 96.6% |
| Accurate 4064 | <<locked>> | 82% | 29,617 psi | 48% | 2638 fps | 95.8% |
| Accurate LT-30 | <<locked>> | 80% | 45,455 psi | 73% | 2854 fps | 99.8% |
| Accurate LT-32 | <<locked>> | 80% | 45,818 psi | 74% | 2871 fps | 98.9% |
| ADI AR 2206H | <<locked>> | 86% | 41,249 psi | 67% | 2894 fps | 95% |
| ADI AR 2207 | <<locked>> | 80% | 49,124 psi | 79% | 2943 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 44,889 psi | 72% | 2946 fps | 95.2% |
| ADI AR 2219 | <<locked>> | 80% | 44,701 psi | 72% | 2959 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 82% | 38,130 psi | 61% | 2799 fps | 95.5% |
| Alliant AR-Comp | <<locked>> | 80% | 33,953 psi | 55% | 2769 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 41,104 psi | 66% | 2953 fps | 95.7% |
| Alliant Power Pro 2000-MR | 38.5 gr | 94% | 48,994 psi | 79% | 3146 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 38,029 psi | 61% | 2844 fps | 95.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 42,032 psi | 68% | 2867 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 44,396 psi | 72% | 2982 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 98% | 43,671 psi | 70% | 3038 fps | 95.9% |
| Alliant Reloder-7 | <<locked>> | 80% | 50,169 psi | 81% | 2956 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 44,353 psi | 72% | 2841 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 49,342 psi | 80% | 3068 fps | 95.9% |
| Bofors RP3 | <<locked>> | 90% | 37,608 psi | 61% | 2848 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 38,174 psi | 62% | 2753 fps | 96.2% |
| Hodgdon BL-C2 | <<locked>> | 82% | 36,056 psi | 58% | 2802 fps | 95.6% |
| Hodgdon CFE223 | 36 gr | 86% | 45,440 psi | 73% | 3061 fps | 95.5% |
| Hodgdon H322 | <<locked>> | 80% | 40,582 psi | 65% | 2877 fps | 99.2% |
| Hodgdon H335 | <<locked>> | 80% | 41,481 psi | 67% | 2897 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 98% | 51,285 psi | 83% | 3091 fps | 95.5% |
| Hodgdon H4198 | <<locked>> | 80% | 50,009 psi | 81% | 2956 fps | 99.9% |
| Hodgdon H4895 | <<locked>> | 86% | 41,495 psi | 67% | 2907 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 39,421 psi | 64% | 2910 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,179 psi | 41% | 1709 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 39,813 psi | 64% | 2851 fps | 95.1% |
| IMR 3031 | <<locked>> | 80% | 32,489 psi | 52% | 2743 fps | 98.2% |
| IMR 4064 | <<locked>> | 92% | 44,077 psi | 71% | 2923 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 43,076 psi | 69% | 2851 fps | 100% |
| IMR 4895 | <<locked>> | 90% | 42,453 psi | 68% | 2956 fps | 95.5% |
| IMR 8208 XBR | <<locked>> | 82% | 38,130 psi | 61% | 2799 fps | 95.5% |
| Lovex D073.4 | <<locked>> | 80% | 48,892 psi | 79% | 3025 fps | 99.2% |
| Lovex D073.5 | <<locked>> | 80% | 39,755 psi | 64% | 2835 fps | 97.1% |
| Lovex D073.6 | <<locked>> | 80% | 31,778 psi | 51% | 2687 fps | 95.3% |
| Lovex S060 | <<locked>> | 86% | 42,322 psi | 68% | 2841 fps | 95.3% |
| Lovex S062 | <<locked>> | 86% | 36,172 psi | 58% | 2766 fps | 95% |
| Norma 200 | <<locked>> | 80% | 47,601 psi | 77% | 2946 fps | 100% |
| Norma 201 | <<locked>> | 84% | 37,782 psi | 61% | 2792 fps | 95.5% |
| Norma 202 | <<locked>> | 80% | 32,953 psi | 53% | 2694 fps | 96.6% |
| Norma 203B | <<locked>> | 92% | 43,569 psi | 70% | 2969 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 92% | 43,598 psi | 70% | 2982 fps | 95.4% |
| Ramshot Wild Boar | <<locked>> | 86% | 42,351 psi | 68% | 2923 fps | 95.3% |
| Ramshot X-Terminator | <<locked>> | 84% | 44,657 psi | 72% | 2910 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,280 psi | 41% | 1749 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 40,437 psi | 65% | 2851 fps | 97.6% |
| ReloadSwiss RS 52 | 36.5 gr | 92% | 46,137 psi | 74% | 3091 fps | 95.7% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 35,926 psi | 58% | 2861 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 36,738 psi | 59% | 2749 fps | 97.4% |
| Rottweil R 902 | <<locked>> | 86% | 38,203 psi | 62% | 2792 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 94% | 39,842 psi | 64% | 2890 fps | 95.5% |
| Shooters World AR Plus | <<locked>> | 80% | 48,892 psi | 79% | 3025 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 31,778 psi | 51% | 2687 fps | 95.3% |
| Shooters World Precision | <<locked>> | 86% | 36,172 psi | 58% | 2766 fps | 95% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 42,859 psi | 69% | 2864 fps | 96.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 49,647 psi | 80% | 2690 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 45,208 psi | 73% | 2966 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 42,018 psi | 68% | 2953 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 42,685 psi | 69% | 2884 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 50,778 psi | 82% | 3045 fps | 95.2% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 42,177 psi | 68% | 2910 fps | 95.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 35,114 psi | 57% | 2664 fps | 97.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 28,529 psi | 46% | 2507 fps | 96% |
| Somchem S321 | <<locked>> | 80% | 38,247 psi | 62% | 2822 fps | 95.9% |
| Somchem S335 | <<locked>> | 80% | 34,548 psi | 56% | 2667 fps | 97.9% |
| Somchem S341 | <<locked>> | 88% | 43,816 psi | 71% | 2930 fps | 95.6% |
| Somchem S355 | <<locked>> | 94% | 41,133 psi | 66% | 2900 fps | 95.6% |
| Vihtavuori N120 | <<locked>> | 80% | 49,110 psi | 79% | 2890 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 39,958 psi | 64% | 2772 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 35,056 psi | 57% | 2677 fps | 99.2% |
| Vihtavuori N135 | <<locked>> | 80% | 30,081 psi | 49% | 2631 fps | 98.4% |
| Vihtavuori N140 | <<locked>> | 80% | 31,212 psi | 50% | 2628 fps | 96.3% |
| Vihtavuori N150 | <<locked>> | 90% | 34,635 psi | 56% | 2726 fps | 95% |
| Vihtavuori N530 | <<locked>> | 82% | 38,174 psi | 62% | 2795 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 30,008 psi | 48% | 2605 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 41,321 psi | 67% | 2861 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 34,374 psi | 55% | 2766 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 88% | 41,510 psi | 67% | 2913 fps | 95.8% |
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 103 powders for .25 GT loaded with the .257 | 87gr | Speer Hot-Cor. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,281 fps; across all powders the maximum-charge window runs from 1,909 fps to 3,281 fps. Accurate 4064 gives the best case fill at 100 %, and 103 of the 103 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (427 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 87.0 gr projectile in 0.257" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Accurate 4064, Accurate 4350, 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. ReloadSwiss RS 52, Alliant Power Pro 2000-MR, Hodgdon CFE223 rank at the top here: for .25 GT with the .257 | 87gr | Speer Hot-Cor they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Accurate 4350, Alliant Reloder-16 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.