Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 145gr | CutEdge ESP Raptor bullet and 94 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, 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.
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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>> | 82% | 54,969 psi | 88% | 3005 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 53,911 psi | 86% | 3025 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 55,898 psi | 90% | 3100 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 52,997 psi | 85% | 3025 fps | 96.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,324 psi | 73% | 2969 fps | 96.7% |
| Accurate 4064 | <<locked>> | 88% | 54,273 psi | 87% | 3077 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 55,042 psi | 88% | 3176 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 84% | 54,389 psi | 87% | 3114 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 90% | 55,825 psi | 90% | 3120 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 82% | 53,287 psi | 85% | 3061 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,462 psi | 87% | 3038 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 54,737 psi | 88% | 3245 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,883 psi | 90% | 3140 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 56,304 psi | 90% | 3163 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 55,956 psi | 90% | 3235 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 53,606 psi | 86% | 3209 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,830 psi | 69% | 2999 fps | 99.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 48,776 psi | 78% | 3189 fps | 98.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 54,404 psi | 87% | 3123 fps | 99.6% |
| Bofors RP3 | <<locked>> | 88% | 53,084 psi | 85% | 3097 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 53,113 psi | 85% | 3068 fps | 96.9% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,882 psi | 88% | 3045 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 52,765 psi | 85% | 3084 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 53,853 psi | 86% | 3110 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 94% | 54,041 psi | 87% | 3166 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 92% | 54,389 psi | 87% | 3130 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 84% | 54,998 psi | 88% | 3123 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 56,057 psi | 90% | 3156 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 54,969 psi | 88% | 3159 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 54,708 psi | 88% | 3205 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,621 psi | 57% | 1955 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 56,289 psi | 90% | 3130 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 55,332 psi | 89% | 3110 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 55,129 psi | 88% | 3097 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 86% | 54,868 psi | 88% | 3077 fps | 97.7% |
| IMR 4350 | <<locked>> | 96% | 53,824 psi | 86% | 3097 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 54,926 psi | 88% | 3100 fps | 97.7% |
| IMR 4831 | <<locked>> | 98% | 55,535 psi | 89% | 3163 fps | 99.7% |
| IMR 4895 | <<locked>> | 86% | 54,172 psi | 87% | 3136 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 82% | 53,287 psi | 85% | 3061 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 54,505 psi | 87% | 3091 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 53,780 psi | 86% | 3038 fps | 99.9% |
| Lovex S062 | <<locked>> | 88% | 54,868 psi | 88% | 3091 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 54,404 psi | 87% | 3094 fps | 98.7% |
| Lovex S070 | <<locked>> | 96% | 55,608 psi | 89% | 3133 fps | 98.1% |
| Norma 201 | <<locked>> | 84% | 52,910 psi | 85% | 3051 fps | 100% |
| Norma 202 | <<locked>> | 84% | 53,766 psi | 86% | 3058 fps | 100% |
| Norma 203B | <<locked>> | 88% | 55,521 psi | 89% | 3146 fps | 100% |
| Norma 204 | <<locked>> | 96% | 54,360 psi | 87% | 3146 fps | 95.8% |
| Norma MRPᴾ | <<locked>> | 100% | 48,486 psi | 78% | 3140 fps | 96.4% |
| Norma URP | <<locked>> | 96% | 53,998 psi | 87% | 3159 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 86% | 52,895 psi | 85% | 3114 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 96% | 52,765 psi | 85% | 3150 fps | 98.2% |
| Ramshot TAC | <<locked>> | 82% | 53,650 psi | 86% | 3077 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 82% | 53,258 psi | 85% | 3094 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,129 psi | 58% | 2001 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 54,070 psi | 87% | 3091 fps | 98.1% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 53,447 psi | 86% | 3173 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 53,417 psi | 86% | 3215 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 54,853 psi | 88% | 3192 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,186 psi | 87% | 3225 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 82% | 53,635 psi | 86% | 3035 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 53,621 psi | 86% | 3054 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 52,895 psi | 85% | 3091 fps | 100% |
| Rottweil R 907 | <<locked>> | 92% | 53,113 psi | 85% | 3068 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 94% | 54,404 psi | 87% | 3094 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 84% | 54,505 psi | 87% | 3091 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 54,868 psi | 88% | 3091 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 55,608 psi | 89% | 3133 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,042 psi | 88% | 3156 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,695 psi | 89% | 3110 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 53,026 psi | 85% | 3081 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,418 psi | 87% | 2995 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,143 psi | 88% | 2995 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 54,534 psi | 87% | 3045 fps | 97.7% |
| Somchem S335 | <<locked>> | 84% | 53,766 psi | 86% | 2989 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 55,419 psi | 89% | 3104 fps | 99.9% |
| Somchem S355 | <<locked>> | 90% | 53,272 psi | 85% | 3091 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 56,260 psi | 90% | 3222 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 51,692 psi | 83% | 3087 fps | 96.6% |
| Vihtavuori N133 | <<locked>> | 84% | 54,839 psi | 88% | 2979 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 53,621 psi | 86% | 3018 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 54,360 psi | 87% | 3035 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 54,723 psi | 88% | 3068 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 52,852 psi | 85% | 3100 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 82% | 53,766 psi | 86% | 3058 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 56,217 psi | 90% | 3081 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 55,361 psi | 89% | 3159 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 47,674 psi | 76% | 3087 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 52,997 psi | 85% | 3074 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,012 psi | 87% | 3110 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 54,273 psi | 87% | 3169 fps | 97.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,406 psi | 62% | 3012 fps | 99.4% |
| Winchester StaBALL Match | <<locked>> | 84% | 52,997 psi | 85% | 3087 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% | 51,648 psi | 83% | 2956 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,106 psi | 71% | 2867 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 52,083 psi | 84% | 3041 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 46,441 psi | 74% | 2904 fps | 95% |
| Accurate 3100 | <<locked>> | 98% | 42,206 psi | 68% | 2907 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 41,727 psi | 67% | 2861 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 35,679 psi | 57% | 2782 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 47,819 psi | 77% | 2995 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 40,538 psi | 65% | 2828 fps | 97.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,980 psi | 80% | 3005 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,821 psi | 81% | 2982 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,947 psi | 70% | 3031 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,422 psi | 65% | 2851 fps | 98.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,410 psi | 70% | 2920 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 84% | 35,694 psi | 57% | 2805 fps | 95.7% |
| Alliant Reloder-17 | 63.3 gr | 80% | 35,172 psi | 56% | 2818 fps | 97.3% |
| Alliant Reloder-23 | <<locked>> | 90% | 31,009 psi | 50% | 2690 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 92% | 36,347 psi | 58% | 2894 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,471 psi | 76% | 3002 fps | 98.8% |
| Bofors RP3 | <<locked>> | 80% | 40,277 psi | 65% | 2854 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 46,630 psi | 75% | 2943 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,517 psi | 83% | 2989 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,255 psi | 79% | 3025 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,973 psi | 66% | 2861 fps | 96.7% |
| Hodgdon H414 | <<locked>> | 88% | 44,092 psi | 71% | 2976 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 90% | 50,981 psi | 82% | 3064 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 48,312 psi | 77% | 3005 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 30,647 psi | 49% | 2628 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,686 psi | 72% | 2976 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 90% | 47,050 psi | 75% | 3061 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,440 psi | 42% | 1749 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,325 psi | 74% | 2953 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 48,414 psi | 78% | 3002 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,583 psi | 68% | 2867 fps | 98.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,150 psi | 72% | 2890 fps | 95.5% |
| IMR 4350 | <<locked>> | 92% | 47,311 psi | 76% | 2976 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 45,600 psi | 73% | 2927 fps | 95.5% |
| IMR 4831 | <<locked>> | 84% | 34,563 psi | 55% | 2740 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 44,498 psi | 71% | 2956 fps | 99% |
| IMR 8208 XBR | <<locked>> | 80% | 49,980 psi | 80% | 3005 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,253 psi | 76% | 2969 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,543 psi | 76% | 2927 fps | 99.4% |
| Lovex S062 | <<locked>> | 80% | 42,612 psi | 68% | 2871 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 39,610 psi | 64% | 2802 fps | 95.4% |
| Lovex S070 | <<locked>> | 88% | 42,960 psi | 69% | 2894 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 46,644 psi | 75% | 2940 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 47,166 psi | 76% | 2946 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,757 psi | 69% | 2907 fps | 98.7% |
| Norma 204 | <<locked>> | 94% | 50,821 psi | 81% | 3084 fps | 95% |
| Norma MRP | <<locked>> | 98% | 45,078 psi | 72% | 3068 fps | 95.4% |
| Norma URP | <<locked>> | 84% | 35,940 psi | 58% | 2785 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 42,685 psi | 68% | 2923 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 88% | 40,219 psi | 64% | 2897 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 49,980 psi | 80% | 3012 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,748 psi | 80% | 3031 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,803 psi | 43% | 1791 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,292 psi | 66% | 2841 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,412 psi | 74% | 3041 fps | 98.9% |
| ReloadSwiss RS 60 | 63.3 gr | 80% | 37,463 psi | 60% | 2890 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 35,708 psi | 57% | 2805 fps | 95.1% |
| ReloadSwiss RS 70 | 69.1 gr | 86% | 38,072 psi | 61% | 2881 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 50,517 psi | 81% | 2982 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,251 psi | 71% | 2887 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 37,840 psi | 61% | 2792 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 88% | 46,630 psi | 75% | 2943 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 84% | 39,610 psi | 64% | 2802 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,253 psi | 76% | 2969 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,612 psi | 68% | 2871 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 88% | 42,960 psi | 69% | 2894 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,088 psi | 63% | 2851 fps | 97.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,443 psi | 78% | 2986 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,470 psi | 75% | 2963 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,848 psi | 77% | 2890 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,001 psi | 64% | 2740 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 44,715 psi | 72% | 2864 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 47,558 psi | 76% | 2887 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,298 psi | 77% | 2979 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 38,493 psi | 62% | 2799 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 28,036 psi | 45% | 2605 fps | 95.7% |
| Somchem S385 | <<locked>> | 98% | 48,370 psi | 78% | 3025 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 48,298 psi | 77% | 2881 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,135 psi | 71% | 2867 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,846 psi | 72% | 2877 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,782 psi | 59% | 2730 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 82% | 35,070 psi | 56% | 2730 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 50,299 psi | 81% | 3002 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,134 psi | 69% | 2861 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 37,028 psi | 59% | 2792 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 90% | 33,765 psi | 54% | 2772 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,503 psi | 52% | 2644 fps | 96.6% |
| Winchester 748 | <<locked>> | 80% | 50,343 psi | 81% | 3051 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 44,092 psi | 71% | 2976 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 94% | 31,386 psi | 50% | 2789 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,137 psi | 74% | 2966 fps | 99.5% |
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 113 powders for .300 Win. Mag. loaded with the .308 | 145gr | CutEdge ESP Raptor. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,245 fps; across all powders the maximum-charge window runs from 1,955 fps to 3,245 fps. Accurate 3100 gives the best case fill at 100 %, and 113 of the 113 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 145.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, ADI AR 2213 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 70, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .300 Win. Mag. with the .308 | 145gr | CutEdge ESP Raptor they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2213, Alliant Reloder-22, Alliant Reloder-25 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.