Load Specifications
Load data in caliber .255 GS with .257 | 100gr | Barnes XLC BT bullet and 94 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-16, ReloadSwiss RS 70 and Hodgdon Superformance.
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 2495 | <<locked>> | 84% | 56,304 psi | 88% | 3051 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,362 psi | 88% | 3081 fps | 97.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,821 psi | 78% | 3054 fps | 97.6% |
| Accurate 4064 | <<locked>> | 86% | 56,173 psi | 88% | 3104 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,550 psi | 87% | 3186 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 84% | 57,667 psi | 90% | 3169 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,376 psi | 87% | 3114 fps | 99.8% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,999 psi | 88% | 3199 fps | 96.1% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,405 psi | 88% | 3114 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 57,711 psi | 90% | 3297 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 56,173 psi | 88% | 3146 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,449 psi | 88% | 3166 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,332 psi | 87% | 3232 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 92% | 56,898 psi | 89% | 3271 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,143 psi | 86% | 3189 fps | 96.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,456 psi | 73% | 3077 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,576 psi | 82% | 3268 fps | 99.4% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 57,392 psi | 90% | 3179 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 57,246 psi | 90% | 3166 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 56,463 psi | 88% | 3127 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,537 psi | 90% | 3091 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,652 psi | 89% | 3150 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 57,537 psi | 90% | 3173 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 94% | 57,450 psi | 90% | 3232 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 92% | 57,363 psi | 90% | 3182 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 82% | 54,984 psi | 86% | 3127 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,767 psi | 87% | 3156 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,708 psi | 86% | 3159 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 53,998 psi | 85% | 3199 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,332 psi | 57% | 1972 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,724 psi | 87% | 3123 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,114 psi | 86% | 3107 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,636 psi | 86% | 3094 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 86% | 57,595 psi | 90% | 3127 fps | 98.1% |
| IMR 4350 | <<locked>> | 96% | 56,782 psi | 89% | 3153 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 92% | 57,711 psi | 90% | 3153 fps | 98% |
| IMR 4831 | <<locked>> | 96% | 55,622 psi | 87% | 3169 fps | 99.6% |
| IMR 4895 | <<locked>> | 84% | 54,244 psi | 85% | 3140 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 82% | 56,405 psi | 88% | 3114 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,013 psi | 86% | 3097 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,376 psi | 88% | 3084 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,158 psi | 86% | 3097 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,636 psi | 86% | 3097 fps | 98.7% |
| Lovex S070 | <<locked>> | 94% | 55,883 psi | 88% | 3140 fps | 98% |
| Norma 201 | <<locked>> | 84% | 57,029 psi | 89% | 3117 fps | 100% |
| Norma 202 | <<locked>> | 84% | 57,188 psi | 90% | 3114 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,767 psi | 87% | 3153 fps | 99.9% |
| Norma 204 | <<locked>> | 96% | 57,580 psi | 90% | 3205 fps | 96.4% |
| Norma MRPᴾ | <<locked>> | 100% | 51,967 psi | 81% | 3215 fps | 97.1% |
| Norma URP | <<locked>> | 96% | 57,363 psi | 90% | 3219 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 56,072 psi | 88% | 3173 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 96% | 56,188 psi | 88% | 3212 fps | 98.7% |
| Ramshot TAC | <<locked>> | 82% | 56,492 psi | 89% | 3127 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,521 psi | 89% | 3150 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,883 psi | 58% | 2014 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 57,232 psi | 90% | 3146 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,768 psi | 89% | 3235 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,449 psi | 88% | 3271 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,737 psi | 86% | 3199 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 57,246 psi | 90% | 3284 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 86% | 57,667 psi | 90% | 3117 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 57,043 psi | 89% | 3156 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,244 psi | 85% | 3173 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 92% | 56,463 psi | 88% | 3127 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,636 psi | 86% | 3097 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,013 psi | 86% | 3097 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,158 psi | 86% | 3097 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,883 psi | 88% | 3140 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,665 psi | 86% | 3156 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,680 psi | 87% | 3114 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,927 psi | 88% | 3133 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 57,305 psi | 90% | 3038 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,636 psi | 86% | 2989 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,694 psi | 86% | 3048 fps | 97.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,737 psi | 84% | 3166 fps | 96% |
| Somchem S335 | <<locked>> | 84% | 57,421 psi | 90% | 3041 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,897 psi | 86% | 3097 fps | 99.9% |
| Somchem S355 | <<locked>> | 90% | 56,884 psi | 89% | 3150 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 56,014 psi | 88% | 3225 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,506 psi | 87% | 3156 fps | 97.2% |
| Vihtavuori N133 | <<locked>> | 84% | 57,508 psi | 90% | 3018 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 57,217 psi | 90% | 3071 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 57,740 psi | 90% | 3087 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,679 psi | 86% | 3071 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,086 psi | 88% | 3156 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 82% | 56,753 psi | 89% | 3110 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 55,869 psi | 88% | 3081 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,535 psi | 87% | 3166 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,880 psi | 81% | 3166 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,782 psi | 87% | 3123 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,348 psi | 90% | 3166 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 57,450 psi | 90% | 3232 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,163 psi | 66% | 3110 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,246 psi | 88% | 3146 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 2495 | <<locked>> | 80% | 49,632 psi | 78% | 2953 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 49,647 psi | 78% | 2963 fps | 95.7% |
| Accurate 3100 | <<locked>> | 94% | 41,089 psi | 64% | 2881 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 46,905 psi | 74% | 2949 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,288 psi | 55% | 2766 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 51,039 psi | 80% | 3054 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 43,497 psi | 68% | 2890 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 98% | 52,692 psi | 83% | 3143 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,924 psi | 83% | 3058 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,297 psi | 74% | 3107 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,092 psi | 69% | 2927 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,847 psi | 73% | 2992 fps | 99% |
| Alliant Reloder-16 | 40.5 gr | 80% | 34,534 psi | 54% | 2769 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,551 psi | 60% | 2904 fps | 98.3% |
| Alliant Reloder-19 | <<locked>> | 98% | 51,953 psi | 81% | 3133 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 86% | 30,821 psi | 48% | 2680 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 90% | 37,492 psi | 59% | 2927 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,560 psi | 79% | 3061 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 44,512 psi | 70% | 2940 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 47,123 psi | 74% | 2953 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 54,375 psi | 85% | 3038 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,098 psi | 83% | 3094 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,657 psi | 70% | 2933 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 86% | 44,454 psi | 70% | 2982 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 88% | 50,778 psi | 80% | 3064 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 51,605 psi | 81% | 3068 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,140 psi | 50% | 2664 fps | 96.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,022 psi | 75% | 3041 fps | 99.8% |
| Hodgdon Superformance | 50.7 gr | 88% | 47,108 psi | 74% | 3064 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,238 psi | 43% | 1765 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,269 psi | 77% | 3012 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 51,793 psi | 81% | 3058 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,730 psi | 72% | 2930 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,877 psi | 75% | 2946 fps | 96.1% |
| IMR 4350 | <<locked>> | 90% | 47,442 psi | 74% | 2982 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 45,629 psi | 72% | 2927 fps | 95.4% |
| IMR 4831 | <<locked>> | 82% | 36,158 psi | 57% | 2776 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 47,964 psi | 75% | 3025 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 52,924 psi | 83% | 3058 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 51,517 psi | 81% | 3041 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,241 psi | 79% | 2979 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 46,282 psi | 73% | 2940 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 41,002 psi | 64% | 2828 fps | 95.7% |
| Lovex S070 | <<locked>> | 86% | 44,150 psi | 69% | 2917 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 50,502 psi | 79% | 3005 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,850 psi | 80% | 3009 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,253 psi | 72% | 2979 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 53,795 psi | 84% | 3140 fps | 95.6% |
| Norma MRP | <<locked>> | 96% | 45,571 psi | 71% | 3084 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 34,940 psi | 55% | 2759 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 46,180 psi | 72% | 2995 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 40,915 psi | 64% | 2913 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 53,084 psi | 83% | 3071 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 53,069 psi | 83% | 3094 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,804 psi | 44% | 1808 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,672 psi | 70% | 2910 fps | 96% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,922 psi | 78% | 3114 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,785 psi | 64% | 2972 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 36,970 psi | 58% | 2835 fps | 95.6% |
| ReloadSwiss RS 70 | 46.5 gr | 84% | 38,827 psi | 61% | 2900 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 48,414 psi | 76% | 2959 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 42,032 psi | 66% | 2881 fps | 99% |
| Rottweil R 905 | <<locked>> | 98% | 51,053 psi | 80% | 3114 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 86% | 47,123 psi | 74% | 2953 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 82% | 41,002 psi | 64% | 2828 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,517 psi | 81% | 3041 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,282 psi | 73% | 2940 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 44,150 psi | 69% | 2917 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,351 psi | 66% | 2923 fps | 98.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,214 psi | 82% | 3054 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,559 psi | 78% | 3022 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,126 psi | 80% | 2943 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,192 psi | 68% | 2799 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 45,571 psi | 71% | 2881 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 50,560 psi | 79% | 3107 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 50,966 psi | 80% | 2943 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,503 psi | 81% | 3038 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 42,221 psi | 66% | 2877 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 31,691 psi | 50% | 2713 fps | 97.5% |
| Somchem S385 | <<locked>> | 96% | 48,950 psi | 77% | 3041 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 51,416 psi | 81% | 2930 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,022 psi | 75% | 2930 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,153 psi | 75% | 2936 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,321 psi | 63% | 2805 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 36,100 psi | 57% | 2753 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 53,461 psi | 84% | 3058 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 46,470 psi | 73% | 2923 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,839 psi | 56% | 2759 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 86% | 33,663 psi | 53% | 2769 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,650 psi | 56% | 2726 fps | 97.7% |
| Winchester 748 | <<locked>> | 80% | 53,722 psi | 84% | 3110 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 44,701 psi | 70% | 2989 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 90% | 31,198 psi | 49% | 2776 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,458 psi | 78% | 3028 fps | 99.8% |
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 113 powders for .255 GS loaded with the .257 | 100gr | Barnes XLC BT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,297 fps; across all powders the maximum-charge window runs from 1,972 fps to 3,297 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 (440 MPa), the top charges use 57–90 %, 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 3100, Accurate MAGPRO, ADI AR 2209 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 Reloder-16, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .255 GS with the .257 | 100gr | Barnes XLC BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Alliant Reloder-22 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.