Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:75 gr
Bullet Diameter:0.224"
Bullet Length:<<locked>>
Caliber:.223 WSSM load data
Case Length (l3):1.663"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:53.7 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:6.5
Load data in caliber .223 WSSM with .224 | 75gr | Peregrine Glider GRM bullet and 94 powders. The key underlying parameters are shown in the table above.
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 2495 | <<locked>> | 84% | 55,941 psi | 88% | 3153 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,549 psi | 85% | 3169 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,924 psi | 81% | 3196 fps | 98.9% |
| Accurate 4064 | <<locked>> | 86% | 56,521 psi | 89% | 3212 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 53,882 psi | 84% | 3261 fps | 99.8% |
| Accurate High Countryᴾ | <<locked>> | 100% | 57,537 psi | 90% | 3422 fps | 97% |
| ADI AR 2206H | <<locked>> | 82% | 55,709 psi | 87% | 3245 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 57,392 psi | 90% | 3255 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,680 psi | 87% | 3310 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,855 psi | 89% | 3389 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,317 psi | 85% | 3222 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,433 psi | 85% | 3238 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,969 psi | 86% | 3330 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 56,521 psi | 89% | 3363 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,723 psi | 86% | 3291 fps | 97.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,953 psi | 81% | 3284 fps | 96.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,747 psi | 76% | 3219 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,656 psi | 67% | 3120 fps | 97.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 56,927 psi | 89% | 3438 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,985 psi | 88% | 3261 fps | 100% |
| Bofors RP3 | <<locked>> | 86% | 55,245 psi | 87% | 3238 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,953 psi | 81% | 3284 fps | 96.9% |
| Bofors RP7 | <<locked>> | 90% | 54,795 psi | 86% | 3215 fps | 98.1% |
| Hodgdon H380 | <<locked>> | 86% | 55,782 psi | 87% | 3255 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 92% | 56,623 psi | 89% | 3323 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 90% | 56,536 psi | 89% | 3281 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 82% | 56,376 psi | 88% | 3258 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,274 psi | 87% | 3245 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,000 psi | 89% | 3297 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 57,392 psi | 90% | 3366 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,042 psi | 56% | 2060 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,711 psi | 90% | 3261 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 57,116 psi | 90% | 3238 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,594 psi | 89% | 3235 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,883 psi | 88% | 3212 fps | 98.7% |
| IMR 4350 | <<locked>> | 94% | 55,869 psi | 88% | 3248 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,376 psi | 88% | 3245 fps | 98.7% |
| IMR 4831 | <<locked>> | 94% | 54,418 psi | 85% | 3255 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 55,854 psi | 88% | 3274 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 56,420 psi | 88% | 3219 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,607 psi | 86% | 3163 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,710 psi | 89% | 3228 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,289 psi | 88% | 3238 fps | 99.5% |
| Lovex S070 | <<locked>> | 92% | 54,331 psi | 85% | 3225 fps | 98.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,873 psi | 67% | 3018 fps | 97.1% |
| Norma 201 | <<locked>> | 82% | 54,215 psi | 85% | 3182 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,071 psi | 86% | 3182 fps | 100% |
| Norma 203B | <<locked>> | 86% | 57,348 psi | 90% | 3284 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,855 psi | 89% | 3307 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 55,579 psi | 87% | 3386 fps | 98.8% |
| Norma URP | <<locked>> | 94% | 56,768 psi | 89% | 3310 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 54,853 psi | 86% | 3255 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 55,593 psi | 87% | 3307 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,651 psi | 57% | 2110 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,796 psi | 87% | 3235 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,376 psi | 87% | 3317 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 56,130 psi | 88% | 3360 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,099 psi | 85% | 3287 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 56,971 psi | 89% | 3386 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 55,158 psi | 86% | 3189 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,129 psi | 86% | 3232 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 57,290 psi | 90% | 3278 fps | 96.6% |
| Rottweil R 905 | <<locked>> | 98% | 53,954 psi | 85% | 3278 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 90% | 54,795 psi | 86% | 3215 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,289 psi | 88% | 3238 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,420 psi | 88% | 3219 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,710 psi | 89% | 3228 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,331 psi | 85% | 3225 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 57,058 psi | 89% | 3297 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 57,246 psi | 90% | 3248 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,317 psi | 85% | 3212 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,216 psi | 87% | 3114 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,507 psi | 89% | 3117 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,275 psi | 88% | 3186 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 57,334 psi | 90% | 3337 fps | 97.9% |
| Somchem S335 | <<locked>> | 82% | 54,897 psi | 86% | 3107 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,927 psi | 89% | 3235 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,259 psi | 87% | 3228 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 55,912 psi | 88% | 3310 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,592 psi | 86% | 3248 fps | 98.1% |
| Vihtavuori N133 | <<locked>> | 82% | 55,753 psi | 87% | 3094 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,448 psi | 87% | 3146 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,825 psi | 87% | 3159 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,739 psi | 89% | 3202 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,071 psi | 86% | 3245 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,314 psi | 79% | 3153 fps | 97% |
| Vihtavuori N540 | <<locked>> | 84% | 54,360 psi | 85% | 3153 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,215 psi | 85% | 3245 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,520 psi | 85% | 3304 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,303 psi | 87% | 3212 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,623 psi | 89% | 3323 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,222 psi | 69% | 3271 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,433 psi | 85% | 3219 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,853 psi | 86% | 3241 fps | 97.2% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 49,124 psi | 77% | 3045 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,558 psi | 75% | 3038 fps | 96.4% |
| Accurate 3100 | <<locked>> | 92% | 38,957 psi | 61% | 2933 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 46,514 psi | 73% | 3048 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,954 psi | 55% | 2861 fps | 96.3% |
| Accurate High Country | <<locked>> | 96% | 49,603 psi | 78% | 3274 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 52,214 psi | 82% | 3186 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,454 psi | 70% | 3018 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 94% | 48,544 psi | 76% | 3173 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,168 psi | 77% | 3251 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,846 psi | 70% | 3045 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,674 psi | 75% | 3117 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,621 psi | 54% | 2881 fps | 96.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,349 psi | 62% | 3028 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 94% | 47,892 psi | 75% | 3159 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 96% | 45,281 psi | 71% | 3150 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 84% | 28,543 psi | 45% | 2710 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 96% | 37,347 psi | 59% | 2979 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 86% | 33,214 psi | 52% | 2907 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,489 psi | 82% | 3202 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 44,715 psi | 70% | 3048 fps | 99.9% |
| Bofors RP5 | <<locked>> | 96% | 45,281 psi | 71% | 3150 fps | 95.1% |
| Bofors RP7 | <<locked>> | 82% | 42,380 psi | 66% | 2966 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 45,281 psi | 71% | 3058 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 82% | 40,103 psi | 63% | 2989 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 84% | 46,108 psi | 72% | 3084 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 52,779 psi | 83% | 3196 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,111 psi | 50% | 2766 fps | 97.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,516 psi | 78% | 3169 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 42,279 psi | 66% | 3068 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,890 psi | 42% | 1847 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,618 psi | 79% | 3143 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,301 psi | 84% | 3179 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,746 psi | 73% | 3058 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,139 psi | 77% | 3087 fps | 97.5% |
| IMR 4350 | <<locked>> | 86% | 43,018 psi | 67% | 2999 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,089 psi | 64% | 2936 fps | 95.3% |
| IMR 4831 | <<locked>> | 80% | 33,881 psi | 53% | 2815 fps | 96% |
| IMR 4895 | <<locked>> | 80% | 48,921 psi | 77% | 3150 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 52,330 psi | 82% | 3156 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,576 psi | 81% | 3110 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,891 psi | 73% | 3058 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,551 psi | 60% | 2881 fps | 96.1% |
| Lovex S070 | <<locked>> | 82% | 39,059 psi | 61% | 2910 fps | 95% |
| Lovex S071 | <<locked>> | 96% | 37,449 psi | 59% | 2897 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 51,169 psi | 80% | 3130 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,909 psi | 81% | 3130 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,050 psi | 74% | 3100 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 49,255 psi | 77% | 3166 fps | 95.8% |
| Norma MRP | <<locked>> | 92% | 41,423 psi | 65% | 3094 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 35,346 psi | 55% | 2867 fps | 96.3% |
| Ramshot Big Game | <<locked>> | 80% | 47,674 psi | 75% | 3127 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 39,450 psi | 62% | 2979 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,209 psi | 43% | 1886 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,614 psi | 71% | 3041 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,692 psi | 81% | 3251 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,872 psi | 66% | 3097 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,157 psi | 55% | 2884 fps | 96% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 34,374 psi | 54% | 2884 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 48,660 psi | 76% | 3074 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,235 psi | 66% | 2992 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 96% | 53,606 psi | 84% | 3212 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 94% | 46,920 psi | 74% | 3140 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 82% | 42,380 psi | 66% | 2966 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,551 psi | 60% | 2881 fps | 96.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,330 psi | 82% | 3156 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,891 psi | 73% | 3058 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 39,059 psi | 61% | 2910 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,439 psi | 68% | 3048 fps | 99.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,606 psi | 84% | 3189 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,908 psi | 80% | 3153 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,011 psi | 82% | 3061 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,816 psi | 69% | 2910 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 40,234 psi | 63% | 2874 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 46,485 psi | 73% | 3136 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 51,851 psi | 81% | 3061 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,345 psi | 84% | 3176 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,670 psi | 67% | 2992 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 31,749 psi | 50% | 2815 fps | 98.4% |
| Somchem S385 | <<locked>> | 90% | 41,655 psi | 65% | 2992 fps | 95% |
| Vihtavuori N133 | <<locked>> | 80% | 52,576 psi | 82% | 3048 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,718 psi | 76% | 3041 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,284 psi | 77% | 3054 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,799 psi | 64% | 2917 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 36,492 psi | 57% | 2864 fps | 96.7% |
| Vihtavuori N165 | <<locked>> | 96% | 43,830 psi | 69% | 3025 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 47,398 psi | 74% | 3038 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,056 psi | 56% | 2864 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 84% | 31,473 psi | 49% | 2799 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,129 psi | 57% | 2838 fps | 98.7% |
| Winchester 760 | <<locked>> | 82% | 40,103 psi | 63% | 2989 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 28,892 psi | 45% | 2808 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,966 psi | 80% | 3159 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 47,543 psi | 75% | 3107 fps | 95.5% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 110 powders for .223 WSSM loaded with the .224 | 75gr | Peregrine Glider GRM. Alliant Reloder-26 delivers the highest muzzle velocity at 3,438 fps; across all powders the maximum-charge window runs from 2,060 fps to 3,438 fps. Accurate 3100 gives the best case fill at 100 %, and 110 of the 110 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 75.0 gr projectile in 0.224" calls for a 1:6.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, Accurate MAGPRO 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. As outliers, Accurate MAGPRO, Baschieri & Pellagri 109, Hodgdon H1000 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.