Load Specifications
Load data in caliber .240 Weath. Mag. with .243 | 80gr | Hasler Hunting 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 2495 | <<locked>> | 84% | 54,897 psi | 86% | 3251 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,521 psi | 89% | 3301 fps | 97.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,053 psi | 78% | 3255 fps | 97.6% |
| Accurate 4064 | <<locked>> | 86% | 55,085 psi | 86% | 3304 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,912 psi | 88% | 3399 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 84% | 57,725 psi | 90% | 3392 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,564 psi | 87% | 3333 fps | 99.7% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 57,159 psi | 90% | 3432 fps | 96.4% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,579 psi | 89% | 3333 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 54,665 psi | 86% | 3465 fps | 99.8% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 57,130 psi | 90% | 3428 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 56,144 psi | 88% | 3360 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,434 psi | 88% | 3383 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 96% | 56,434 psi | 88% | 3465 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 90% | 54,186 psi | 85% | 3432 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 56,275 psi | 88% | 3415 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,789 psi | 73% | 3278 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 53,998 psi | 85% | 3491 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 54,317 psi | 85% | 3340 fps | 99.5% |
| Bofors RP3 | <<locked>> | 88% | 57,145 psi | 90% | 3379 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 56,608 psi | 89% | 3343 fps | 97.4% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,536 psi | 89% | 3363 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 57,711 psi | 90% | 3392 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 92% | 54,534 psi | 85% | 3386 fps | 97.6% |
| Hodgdon H4350 | <<locked>> | 90% | 54,578 psi | 86% | 3346 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 82% | 55,027 psi | 86% | 3343 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 56,739 psi | 89% | 3376 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,955 psi | 86% | 3376 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,085 psi | 86% | 3422 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,042 psi | 56% | 2149 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 56,028 psi | 88% | 3346 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,347 psi | 87% | 3330 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,100 psi | 86% | 3320 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 84% | 54,447 psi | 85% | 3287 fps | 97.5% |
| IMR 4350 | <<locked>> | 96% | 57,566 psi | 90% | 3376 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 54,926 psi | 86% | 3320 fps | 97.5% |
| IMR 4831 | <<locked>> | 96% | 56,188 psi | 88% | 3386 fps | 99.6% |
| IMR 4895 | <<locked>> | 84% | 54,230 psi | 85% | 3356 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 82% | 56,579 psi | 89% | 3333 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 54,607 psi | 86% | 3304 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,637 psi | 89% | 3307 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,230 psi | 87% | 3314 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,621 psi | 86% | 3310 fps | 98.6% |
| Lovex S070 | <<locked>> | 94% | 55,869 psi | 88% | 3350 fps | 98% |
| Norma 201 | <<locked>> | 84% | 56,623 psi | 89% | 3330 fps | 100% |
| Norma 202 | <<locked>> | 84% | 57,217 psi | 90% | 3330 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,724 psi | 87% | 3366 fps | 99.9% |
| Norma MRPᴾ | <<locked>> | 100% | 52,910 psi | 83% | 3432 fps | 97.3% |
| Norma URP | <<locked>> | 94% | 54,375 psi | 85% | 3376 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 86% | 56,666 psi | 89% | 3392 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 96% | 57,101 psi | 89% | 3435 fps | 98.8% |
| Ramshot TAC | <<locked>> | 82% | 56,869 psi | 89% | 3350 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,985 psi | 89% | 3373 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,492 psi | 57% | 2195 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 54,186 psi | 85% | 3307 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 57,392 psi | 90% | 3461 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 57,667 psi | 90% | 3497 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,811 psi | 87% | 3419 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 54,679 psi | 86% | 3448 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 82% | 57,290 psi | 90% | 3314 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 57,305 psi | 90% | 3333 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 57,000 psi | 89% | 3369 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 55,419 psi | 87% | 3399 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 92% | 56,608 psi | 89% | 3343 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,621 psi | 86% | 3310 fps | 98.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,607 psi | 86% | 3304 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,230 psi | 87% | 3314 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,869 psi | 88% | 3350 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 55,085 psi | 86% | 3373 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,767 psi | 87% | 3330 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,391 psi | 88% | 3353 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 57,464 psi | 90% | 3261 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,795 psi | 86% | 3202 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,650 psi | 86% | 3255 fps | 97.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,911 psi | 86% | 3389 fps | 96.2% |
| Somchem S335 | <<locked>> | 84% | 57,276 psi | 90% | 3255 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,259 psi | 87% | 3314 fps | 99.9% |
| Somchem S355 | <<locked>> | 90% | 57,014 psi | 89% | 3366 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 57,479 psi | 90% | 3448 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 56,260 psi | 88% | 3373 fps | 97.4% |
| Vihtavuori N133 | <<locked>> | 82% | 54,505 psi | 85% | 3192 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 57,246 psi | 90% | 3291 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 54,157 psi | 85% | 3245 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,868 psi | 86% | 3281 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,898 psi | 89% | 3379 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 56,898 psi | 89% | 3330 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 56,159 psi | 88% | 3297 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 56,072 psi | 88% | 3379 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,605 psi | 82% | 3376 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 56,956 psi | 89% | 3343 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,667 psi | 90% | 3386 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,839 psi | 86% | 3392 fps | 97.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,569 psi | 67% | 3314 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,666 psi | 89% | 3366 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% | 48,124 psi | 75% | 3140 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 49,603 psi | 78% | 3169 fps | 95.6% |
| Accurate 3100 | <<locked>> | 94% | 40,582 psi | 64% | 3051 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 45,527 psi | 71% | 3136 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 36,695 psi | 57% | 2989 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 50,952 psi | 80% | 3268 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 43,120 psi | 68% | 3084 fps | 98% |
| ADI AR 2209 | <<locked>> | 98% | 53,693 psi | 84% | 3369 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,997 psi | 83% | 3271 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,326 psi | 74% | 3314 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 53,359 psi | 84% | 3356 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,439 psi | 68% | 3117 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,528 psi | 73% | 3192 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 35,911 psi | 56% | 2999 fps | 95.4% |
| Alliant Reloder-17 | 45 gr | 80% | 38,029 psi | 60% | 3084 fps | 98% |
| Alliant Reloder-19 | <<locked>> | 98% | 52,605 psi | 82% | 3346 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 88% | 31,836 psi | 50% | 2890 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 90% | 37,333 psi | 59% | 3104 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,894 psi | 80% | 3274 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 43,685 psi | 68% | 3127 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 46,934 psi | 74% | 3156 fps | 95.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,924 psi | 83% | 3301 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,063 psi | 69% | 3127 fps | 97.3% |
| Hodgdon H414 | <<locked>> | 86% | 44,469 psi | 70% | 3182 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 88% | 51,068 psi | 80% | 3278 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 51,503 psi | 81% | 3281 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,140 psi | 49% | 2818 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,993 psi | 75% | 3245 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 47,427 psi | 74% | 3268 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,905 psi | 42% | 1929 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,081 psi | 77% | 3219 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 51,576 psi | 81% | 3268 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,324 psi | 71% | 3130 fps | 98.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,776 psi | 75% | 3156 fps | 96% |
| IMR 4350 | <<locked>> | 90% | 47,558 psi | 75% | 3186 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 45,484 psi | 71% | 3127 fps | 95.3% |
| IMR 4831 | <<locked>> | 82% | 35,317 psi | 55% | 2940 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 47,703 psi | 75% | 3228 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 52,997 psi | 83% | 3271 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,966 psi | 80% | 3241 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,038 psi | 78% | 3189 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 45,484 psi | 71% | 3130 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 40,030 psi | 63% | 3002 fps | 95.2% |
| Lovex S070 | <<locked>> | 86% | 43,424 psi | 68% | 3097 fps | 95% |
| Norma 201 | <<locked>> | 80% | 49,893 psi | 78% | 3212 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 50,343 psi | 79% | 3215 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,890 psi | 72% | 3179 fps | 99.1% |
| Norma MRP | <<locked>> | 96% | 46,006 psi | 72% | 3287 fps | 95.4% |
| Norma URP | <<locked>> | 82% | 36,579 psi | 57% | 2986 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 46,079 psi | 72% | 3196 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 43,584 psi | 68% | 3166 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 53,026 psi | 83% | 3278 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 53,069 psi | 83% | 3307 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,137 psi | 43% | 1969 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,266 psi | 69% | 3104 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,966 psi | 78% | 3323 fps | 99.2% |
| ReloadSwiss RS 60 | 45 gr | 80% | 40,480 psi | 63% | 3159 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 36,463 psi | 57% | 3002 fps | 95% |
| ReloadSwiss RS 70 | 48 gr | 84% | 38,421 psi | 60% | 3077 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 53,679 psi | 84% | 3255 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,224 psi | 74% | 3150 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 40,915 psi | 64% | 3058 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 98% | 51,619 psi | 81% | 3327 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 86% | 46,934 psi | 74% | 3156 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 82% | 40,030 psi | 63% | 3002 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,966 psi | 80% | 3241 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,484 psi | 71% | 3130 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 86% | 43,424 psi | 68% | 3097 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,105 psi | 66% | 3114 fps | 98.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,837 psi | 81% | 3258 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,487 psi | 78% | 3228 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,807 psi | 80% | 3153 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,757 psi | 67% | 2992 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 44,889 psi | 70% | 3064 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 51,140 psi | 80% | 3320 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 50,604 psi | 79% | 3150 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,750 psi | 81% | 3251 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 41,539 psi | 65% | 3064 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 30,748 psi | 48% | 2864 fps | 96.7% |
| Somchem S385 | <<locked>> | 96% | 49,110 psi | 77% | 3238 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 51,285 psi | 80% | 3140 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,427 psi | 74% | 3130 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,688 psi | 75% | 3133 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,494 psi | 62% | 2982 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 82% | 38,116 psi | 60% | 2992 fps | 95.9% |
| Vihtavuori N530 | <<locked>> | 80% | 53,490 psi | 84% | 3274 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 46,151 psi | 72% | 3120 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 37,507 psi | 59% | 2986 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 88% | 35,070 psi | 55% | 2982 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,172 psi | 55% | 2897 fps | 97.3% |
| Winchester 748 | <<locked>> | 80% | 53,911 psi | 84% | 3327 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 44,773 psi | 70% | 3186 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 30,139 psi | 47% | 2910 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,342 psi | 77% | 3232 fps | 99.7% |
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 94 powders for .240 Weath. Mag. loaded with the .243 | 80gr | Hasler Hunting. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,497 fps; across all powders the maximum-charge window runs from 2,149 fps to 3,497 fps. Accurate 3100 gives the best case fill at 100 %, and 94 of the 94 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 80.0 gr projectile in 0.243" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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 .240 Weath. Mag. with the .243 | 80gr | Hasler Hunting they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.