Load Specifications
Load data in caliber 8 x 64 S with .323 | 220gr | Swift A-Frame 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 Power Pro 2000-MR, Hodgdon Superformance and Alliant Reloder-17.
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: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 52,982 psi | 90% | 2369 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 51,169 psi | 87% | 2392 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 53,055 psi | 90% | 2451 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 50,807 psi | 86% | 2388 fps | 96.4% |
| Accurate 4064 | <<locked>> | 90% | 51,184 psi | 87% | 2434 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 50,140 psi | 85% | 2503 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 86% | 52,127 psi | 89% | 2464 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 52,953 psi | 90% | 2461 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 51,329 psi | 87% | 2421 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 51,851 psi | 88% | 2398 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 51,271 psi | 87% | 2562 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 52,837 psi | 90% | 2484 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 50,169 psi | 85% | 2454 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,011 psi | 89% | 2552 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 96% | 52,910 psi | 90% | 2589 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,985 psi | 63% | 2320 fps | 98.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,915 psi | 70% | 2457 fps | 97.5% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 51,488 psi | 88% | 2474 fps | 99.5% |
| Bofors RP3 | <<locked>> | 90% | 49,632 psi | 84% | 2448 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 50,415 psi | 86% | 2421 fps | 96.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 50,082 psi | 85% | 2362 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 50,082 psi | 85% | 2444 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 51,924 psi | 88% | 2530 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 90% | 50,865 psi | 87% | 2461 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 96% | 49,922 psi | 85% | 2500 fps | 97.3% |
| Hodgdon H4350 | <<locked>> | 94% | 51,140 psi | 87% | 2470 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 86% | 52,663 psi | 90% | 2470 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,138 psi | 82% | 2444 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 51,605 psi | 88% | 2500 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 50,357 psi | 86% | 2526 fps | 96.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,433 psi | 60% | 1486 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 50,459 psi | 86% | 2428 fps | 99.9% |
| IMR 3031 | <<locked>> | 86% | 52,446 psi | 89% | 2454 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 52,417 psi | 89% | 2444 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 88% | 52,794 psi | 90% | 2431 fps | 97.6% |
| IMR 4350 | <<locked>> | 98% | 50,111 psi | 85% | 2441 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 94% | 52,228 psi | 89% | 2451 fps | 97.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,010 psi | 87% | 2500 fps | 99.5% |
| IMR 4895 | <<locked>> | 88% | 51,430 psi | 88% | 2480 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 84% | 51,329 psi | 87% | 2421 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 51,358 psi | 87% | 2441 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 52,011 psi | 89% | 2398 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 52,170 psi | 89% | 2441 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 51,459 psi | 88% | 2448 fps | 98.5% |
| Lovex S070 | <<locked>> | 98% | 51,851 psi | 88% | 2470 fps | 97.7% |
| Norma 201 | <<locked>> | 86% | 50,836 psi | 87% | 2411 fps | 100% |
| Norma 202 | <<locked>> | 86% | 51,358 psi | 87% | 2418 fps | 100% |
| Norma 203B | <<locked>> | 90% | 52,562 psi | 89% | 2487 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 52,837 psi | 90% | 2539 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 90% | 52,968 psi | 90% | 2513 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,706 psi | 88% | 2533 fps | 98.3% |
| Ramshot TAC | <<locked>> | 84% | 51,242 psi | 87% | 2434 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 50,865 psi | 87% | 2451 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 82% | 51,938 psi | 88% | 2418 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,737 psi | 61% | 1519 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 51,242 psi | 87% | 2444 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 49,966 psi | 85% | 2507 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 52,953 psi | 90% | 2589 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 49,690 psi | 85% | 2520 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 50,038 psi | 85% | 2546 fps | 98.9% |
| Rottweil R 901 | <<locked>> | 84% | 51,996 psi | 89% | 2395 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 51,314 psi | 87% | 2411 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 52,779 psi | 90% | 2484 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 50,415 psi | 86% | 2421 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 96% | 51,459 psi | 88% | 2448 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 86% | 51,358 psi | 87% | 2441 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 52,170 psi | 89% | 2441 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 51,851 psi | 88% | 2470 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 51,271 psi | 87% | 2497 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 49,661 psi | 85% | 2415 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 50,386 psi | 86% | 2438 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 52,663 psi | 90% | 2362 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 52,402 psi | 89% | 2362 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 51,459 psi | 88% | 2402 fps | 97.3% |
| Somchem S321 | <<locked>> | 82% | 52,054 psi | 89% | 2448 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 51,808 psi | 88% | 2362 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 52,562 psi | 89% | 2454 fps | 99.9% |
| Somchem S355 | <<locked>> | 92% | 50,256 psi | 86% | 2441 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,297 psi | 81% | 2493 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 52,547 psi | 89% | 2329 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 52,866 psi | 90% | 2349 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 50,850 psi | 87% | 2382 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 51,909 psi | 88% | 2398 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 51,271 psi | 87% | 2421 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 52,083 psi | 89% | 2490 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 84% | 51,619 psi | 88% | 2418 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 49,821 psi | 85% | 2395 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 51,169 psi | 87% | 2497 fps | 99.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,147 psi | 68% | 2392 fps | 98.4% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 52,649 psi | 90% | 2477 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 51,010 psi | 87% | 2457 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 50,169 psi | 85% | 2503 fps | 97.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,953 psi | 56% | 2313 fps | 98% |
| Winchester StaBALL Match | <<locked>> | 86% | 50,154 psi | 85% | 2444 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 46,920 psi | 80% | 2293 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,624 psi | 67% | 2231 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,485 psi | 79% | 2362 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 47,776 psi | 81% | 2343 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 37,463 psi | 64% | 2228 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 33,373 psi | 57% | 2211 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 43,308 psi | 74% | 2326 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 80% | 36,883 psi | 63% | 2195 fps | 97.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,368 psi | 77% | 2333 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 45,295 psi | 77% | 2316 fps | 100% |
| Alliant Power Pro 2000-MR | 47.2 gr | 80% | 38,972 psi | 66% | 2346 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,201 psi | 62% | 2211 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,073 psi | 67% | 2270 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 84% | 32,068 psi | 55% | 2175 fps | 95% |
| Alliant Reloder-17 | 46.5 gr | 80% | 31,198 psi | 53% | 2182 fps | 96.6% |
| Alliant Reloder-23 | <<locked>> | 92% | 29,153 psi | 50% | 2136 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,665 psi | 61% | 2343 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,163 psi | 72% | 2326 fps | 98.2% |
| Bofors RP3 | <<locked>> | 80% | 35,708 psi | 61% | 2215 fps | 98.6% |
| Bofors RP7 | <<locked>> | 90% | 44,556 psi | 76% | 2329 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,137 psi | 80% | 2320 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,700 psi | 74% | 2349 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,428 psi | 82% | 2480 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 80% | 36,651 psi | 62% | 2218 fps | 96.1% |
| Hodgdon H414 | <<locked>> | 90% | 41,089 psi | 70% | 2352 fps | 95% |
| Hodgdon H4350 | <<locked>> | 92% | 48,095 psi | 82% | 2421 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 43,671 psi | 74% | 2336 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,327 psi | 50% | 2087 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,378 psi | 67% | 2306 fps | 99.3% |
| Hodgdon Superformance | 56.5 gr | 92% | 43,671 psi | 74% | 2415 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,252 psi | 45% | 1322 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,843 psi | 71% | 2290 fps | 99.3% |
| IMR 3031 | <<locked>> | 80% | 43,236 psi | 74% | 2329 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,725 psi | 66% | 2224 fps | 98% |
| IMR 4166 Enduron | <<locked>> | 82% | 43,729 psi | 74% | 2287 fps | 95.6% |
| IMR 4350 | <<locked>> | 94% | 44,338 psi | 75% | 2349 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 88% | 43,540 psi | 74% | 2313 fps | 95.5% |
| IMR 4831 | <<locked>> | 86% | 32,474 psi | 55% | 2175 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 39,987 psi | 68% | 2297 fps | 98.7% |
| IMR 8208 XBR | <<locked>> | 80% | 45,368 psi | 77% | 2333 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 42,148 psi | 72% | 2306 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,323 psi | 74% | 2267 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 38,363 psi | 65% | 2224 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 37,884 psi | 64% | 2218 fps | 95.5% |
| Lovex S070 | <<locked>> | 90% | 40,756 psi | 69% | 2293 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 42,395 psi | 72% | 2283 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 42,525 psi | 72% | 2290 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,479 psi | 66% | 2260 fps | 98.4% |
| Norma URP | <<locked>> | 86% | 33,953 psi | 58% | 2215 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 37,637 psi | 64% | 2267 fps | 98% |
| Ramshot Hunter | <<locked>> | 92% | 40,205 psi | 68% | 2343 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 45,020 psi | 77% | 2336 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,498 psi | 76% | 2356 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,660 psi | 83% | 2372 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,600 psi | 45% | 1355 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 39,653 psi | 68% | 2254 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,683 psi | 69% | 2356 fps | 98.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,214 psi | 57% | 2241 fps | 99.4% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 33,243 psi | 57% | 2224 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 35,911 psi | 61% | 2280 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 46,224 psi | 79% | 2316 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,437 psi | 69% | 2244 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 33,779 psi | 58% | 2169 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 90% | 44,556 psi | 76% | 2329 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 86% | 37,884 psi | 64% | 2218 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,148 psi | 72% | 2306 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,363 psi | 65% | 2224 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 40,756 psi | 69% | 2293 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,606 psi | 59% | 2211 fps | 97.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,337 psi | 74% | 2316 fps | 97.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,684 psi | 71% | 2297 fps | 98.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,685 psi | 74% | 2238 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,260 psi | 62% | 2126 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 42,395 psi | 72% | 2264 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 48,704 psi | 83% | 2398 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 43,366 psi | 74% | 2244 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,917 psi | 73% | 2310 fps | 99.1% |
| Somchem S355 | <<locked>> | 80% | 34,650 psi | 59% | 2175 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 25,063 psi | 43% | 2024 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 49,371 psi | 84% | 2290 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,976 psi | 75% | 2231 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,610 psi | 67% | 2224 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,379 psi | 69% | 2234 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,924 psi | 56% | 2119 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 33,286 psi | 57% | 2169 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 45,194 psi | 77% | 2326 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 38,711 psi | 66% | 2224 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 34,751 psi | 59% | 2215 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 92% | 31,024 psi | 53% | 2201 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,153 psi | 50% | 2054 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 44,672 psi | 76% | 2365 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 41,307 psi | 70% | 2356 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 96% | 29,225 psi | 50% | 2205 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,118 psi | 70% | 2303 fps | 99.2% |
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 8 x 64 S loaded with the .323 | 220gr | Swift A-Frame. Alliant Reloder-17 delivers the highest muzzle velocity at 2,589 fps; across all powders the maximum-charge window runs from 1,486 fps to 2,589 fps. Alliant Reloder-16 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 (405 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 220.0 gr projectile in 0.323" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-16, Alliant Reloder-23, Alliant Reloder-26 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 Power Pro 2000-MR, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for 8 x 64 S with the .323 | 220gr | Swift A-Frame 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.