Load Specifications
Load data in caliber .308 Win. Ackley Improved with .308 | 190gr | Hornady Sub-X bullet and 93 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, ReloadSwiss RS 52 and Hodgdon LEVERevolution.
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>> | 88% | 51,590 psi | 86% | 2402 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 53,330 psi | 89% | 2467 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 51,547 psi | 86% | 2454 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 51,010 psi | 85% | 2474 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 51,271 psi | 85% | 2490 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 43,395 psi | 72% | 2444 fps | 97.2% |
| Accurate LT-30 | <<locked>> | 82% | 51,706 psi | 86% | 2352 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 52,098 psi | 87% | 2372 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 53,853 psi | 89% | 2526 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 96% | 51,358 psi | 85% | 2474 fps | 98.9% |
| ADI AR 2219 | <<locked>> | 82% | 51,706 psi | 86% | 2457 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 53,359 psi | 89% | 2487 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 90% | 52,504 psi | 87% | 2467 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 51,155 psi | 85% | 2530 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 53,098 psi | 88% | 2621 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 53,693 psi | 89% | 2539 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 84% | 51,851 psi | 86% | 2411 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 51,401 psi | 85% | 2513 fps | 99.1% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 44,005 psi | 73% | 2451 fps | 97.3% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 50,488 psi | 84% | 2589 fps | 99.6% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 53,809 psi | 89% | 2395 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 53,084 psi | 88% | 2536 fps | 98.9% |
| Bofors RP3 | <<locked>> | 98% | 53,940 psi | 90% | 2552 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 88% | 52,170 psi | 87% | 2431 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 51,547 psi | 86% | 2513 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 53,461 psi | 89% | 2598 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 86% | 53,940 psi | 90% | 2487 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 51,256 psi | 85% | 2464 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 51,953 psi | 86% | 2513 fps | 98.2% |
| Hodgdon H4895 | <<locked>> | 92% | 54,317 psi | 90% | 2536 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 40,118 psi | 67% | 2349 fps | 97.9% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 52,547 psi | 87% | 2562 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,447 psi | 57% | 1480 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 52,257 psi | 87% | 2490 fps | 99.6% |
| IMR 3031 | <<locked>> | 92% | 53,417 psi | 89% | 2523 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 54,114 psi | 90% | 2503 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 92% | 51,924 psi | 86% | 2441 fps | 95.9% |
| IMR 4198 | <<locked>> | 84% | 52,373 psi | 87% | 2375 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 53,969 psi | 90% | 2500 fps | 96.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 41,698 psi | 69% | 2395 fps | 96.8% |
| IMR 4895 | <<locked>> | 94% | 52,634 psi | 87% | 2543 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 90% | 53,359 psi | 89% | 2487 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 86% | 53,243 psi | 88% | 2477 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 52,417 psi | 87% | 2503 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 54,128 psi | 90% | 2461 fps | 99.6% |
| Lovex S062 | <<locked>> | 96% | 53,432 psi | 89% | 2503 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 49,168 psi | 82% | 2444 fps | 96.8% |
| Norma 201 | <<locked>> | 92% | 52,692 psi | 88% | 2480 fps | 99.9% |
| Norma 202 | <<locked>> | 92% | 52,866 psi | 88% | 2484 fps | 100% |
| Norma 203B | <<locked>> | 96% | 53,722 psi | 89% | 2546 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 43,859 psi | 73% | 2441 fps | 97.1% |
| Ramshot Big Game | <<locked>> | 96% | 53,795 psi | 89% | 2569 fps | 99.5% |
| Ramshot TAC | <<locked>> | 90% | 53,838 psi | 89% | 2500 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 90% | 52,750 psi | 88% | 2520 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 88% | 54,404 psi | 90% | 2487 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,737 psi | 58% | 1516 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 52,968 psi | 88% | 2474 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 52,736 psi | 88% | 2493 fps | 96.8% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 54,346 psi | 90% | 2618 fps | 99.4% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 53,925 psi | 90% | 2644 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 43,511 psi | 72% | 2464 fps | 96.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 44,976 psi | 75% | 2480 fps | 96.1% |
| Rottweil R 901 | <<locked>> | 90% | 53,708 psi | 89% | 2464 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 52,692 psi | 88% | 2470 fps | 99.9% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 53,403 psi | 89% | 2539 fps | 99.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 49,168 psi | 82% | 2444 fps | 96.8% |
| Shooters World Match Rifle | <<locked>> | 92% | 52,417 psi | 87% | 2503 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 53,432 psi | 89% | 2503 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 52,852 psi | 88% | 2444 fps | 99.8% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 52,315 psi | 87% | 2474 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 51,764 psi | 86% | 2546 fps | 99.4% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 52,388 psi | 87% | 2425 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 51,387 psi | 85% | 2470 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 51,982 psi | 86% | 2497 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 51,576 psi | 86% | 2388 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 54,273 psi | 90% | 2428 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 54,360 psi | 90% | 2520 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 53,954 psi | 90% | 2431 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 54,360 psi | 90% | 2516 fps | 99.5% |
| Somchem S355ᴾ | <<locked>> | 100% | 54,157 psi | 90% | 2539 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,175 psi | 65% | 2398 fps | 99% |
| Vihtavuori N130 | <<locked>> | 86% | 51,619 psi | 86% | 2365 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 51,488 psi | 86% | 2379 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 51,561 psi | 86% | 2444 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 53,185 psi | 88% | 2464 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 52,373 psi | 87% | 2480 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 46,296 psi | 77% | 2441 fps | 97.5% |
| Vihtavuori N530 | <<locked>> | 90% | 53,737 psi | 89% | 2487 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 94% | 51,358 psi | 85% | 2464 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 45,223 psi | 75% | 2448 fps | 97.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 47,659 psi | 79% | 2434 fps | 99.2% |
| Winchester 748 | <<locked>> | 90% | 52,736 psi | 88% | 2530 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 92% | 51,416 psi | 85% | 2507 fps | 99.6% |
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% | 40,306 psi | 67% | 2244 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 43,584 psi | 72% | 2333 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 32,808 psi | 55% | 2165 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 38,957 psi | 65% | 2290 fps | 99.5% |
| Accurate 4064 | <<locked>> | 80% | 31,009 psi | 52% | 2152 fps | 98.9% |
| Accurate 4350 | <<locked>> | 96% | 37,826 psi | 63% | 2346 fps | 95.7% |
| Accurate LT-30 | <<locked>> | 80% | 48,921 psi | 81% | 2316 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,313 psi | 82% | 2336 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 36,985 psi | 61% | 2247 fps | 96.8% |
| ADI AR 2208 | <<locked>> | 84% | 35,723 psi | 59% | 2208 fps | 95.5% |
| ADI AR 2219 | <<locked>> | 80% | 48,472 psi | 81% | 2415 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,001 psi | 65% | 2264 fps | 98.4% |
| Alliant AR-Comp | <<locked>> | 80% | 37,739 psi | 63% | 2264 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 44,933 psi | 75% | 2434 fps | 99% |
| Alliant Power Pro 2000-MR | 40.7 gr | 84% | 37,927 psi | 63% | 2352 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,443 psi | 51% | 2133 fps | 95.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 45,643 psi | 76% | 2329 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 35,128 psi | 58% | 2231 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 94% | 36,941 psi | 61% | 2313 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 86% | 32,010 psi | 53% | 2231 fps | 95% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 47,616 psi | 79% | 2316 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 35,853 psi | 60% | 2244 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 29,660 psi | 49% | 2129 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,988 psi | 68% | 2257 fps | 99.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,941 psi | 61% | 2277 fps | 98.5% |
| Hodgdon CFE223 | <<locked>> | 80% | 40,524 psi | 67% | 2388 fps | 97.2% |
| Hodgdon H322 | <<locked>> | 80% | 44,483 psi | 74% | 2359 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 44,991 psi | 75% | 2375 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 40,089 psi | 67% | 2323 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 37,231 psi | 62% | 2260 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 31,502 psi | 52% | 2169 fps | 95% |
| Hodgdon LEVERevolution | 38 gr | 80% | 33,170 psi | 55% | 2224 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,744 psi | 43% | 1325 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,955 psi | 60% | 2218 fps | 96.9% |
| IMR 3031 | <<locked>> | 80% | 36,129 psi | 60% | 2267 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 35,157 psi | 58% | 2192 fps | 95.6% |
| IMR 4166 Enduron | <<locked>> | 90% | 48,849 psi | 81% | 2395 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 46,398 psi | 77% | 2297 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 50,850 psi | 84% | 2457 fps | 95.5% |
| IMR 4831 | <<locked>> | 96% | 36,782 psi | 61% | 2303 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 33,707 psi | 56% | 2211 fps | 95.8% |
| IMR 8208 XBR | <<locked>> | 80% | 39,001 psi | 65% | 2264 fps | 98.4% |
| Lovex D073.5 | <<locked>> | 80% | 43,569 psi | 72% | 2339 fps | 99.6% |
| Lovex D073.6 | <<locked>> | 80% | 35,143 psi | 58% | 2231 fps | 99% |
| Lovex S060 | <<locked>> | 80% | 37,884 psi | 63% | 2201 fps | 97% |
| Lovex S062 | <<locked>> | 80% | 32,692 psi | 54% | 2152 fps | 96.9% |
| Lovex S065 | <<locked>> | 96% | 43,526 psi | 72% | 2356 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 36,318 psi | 60% | 2211 fps | 97.9% |
| Norma 202 | <<locked>> | 80% | 36,260 psi | 60% | 2228 fps | 99.5% |
| Norma 203B | <<locked>> | 80% | 32,358 psi | 54% | 2175 fps | 95.2% |
| Norma URP | <<locked>> | 96% | 38,682 psi | 64% | 2349 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 82% | 33,895 psi | 56% | 2228 fps | 95.4% |
| Ramshot TAC | <<locked>> | 82% | 41,365 psi | 69% | 2303 fps | 95.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 37,811 psi | 63% | 2277 fps | 96.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,322 psi | 70% | 2306 fps | 97.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,846 psi | 43% | 1355 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 43,729 psi | 73% | 2339 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 46,369 psi | 77% | 2398 fps | 95.4% |
| ReloadSwiss RS 52 | 37.6 gr | 80% | 33,895 psi | 56% | 2264 fps | 95% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,268 psi | 47% | 2139 fps | 96% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 38,101 psi | 63% | 2362 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 42,003 psi | 70% | 2425 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 40,089 psi | 67% | 2260 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 34,592 psi | 57% | 2169 fps | 97.4% |
| Rottweil R 903 | <<locked>> | 82% | 29,820 psi | 50% | 2126 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 96% | 43,526 psi | 72% | 2356 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 35,143 psi | 58% | 2231 fps | 99% |
| Shooters World Precision | <<locked>> | 80% | 32,692 psi | 54% | 2152 fps | 96.9% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,282 psi | 77% | 2352 fps | 99.3% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 48,834 psi | 81% | 2425 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 33,301 psi | 55% | 2218 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 46,383 psi | 77% | 2343 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 39,189 psi | 65% | 2274 fps | 95.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 35,549 psi | 59% | 2221 fps | 96.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,985 psi | 63% | 2185 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,096 psi | 52% | 2067 fps | 99.2% |
| Somchem S321 | <<locked>> | 80% | 41,698 psi | 69% | 2333 fps | 99.1% |
| Somchem S335 | <<locked>> | 80% | 37,463 psi | 62% | 2188 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 36,448 psi | 61% | 2231 fps | 96.4% |
| Somchem S355 | <<locked>> | 82% | 31,038 psi | 52% | 2139 fps | 95.3% |
| Somchem S365 | <<locked>> | 90% | 28,601 psi | 48% | 2156 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 43,105 psi | 72% | 2247 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,058 psi | 63% | 2185 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 33,301 psi | 55% | 2165 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 34,243 psi | 57% | 2169 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 80% | 27,586 psi | 46% | 2041 fps | 95.5% |
| Vihtavuori N160 | <<locked>> | 94% | 38,334 psi | 64% | 2303 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 38,841 psi | 65% | 2257 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 80% | 32,938 psi | 55% | 2159 fps | 98.8% |
| Vihtavuori N550 | <<locked>> | 96% | 39,668 psi | 66% | 2352 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 32,271 psi | 54% | 2149 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 37,594 psi | 62% | 2293 fps | 98.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 34,606 psi | 57% | 2221 fps | 96.7% |
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 93 powders for .308 Win. Ackley Improved loaded with the .308 | 190gr | Hornady Sub-X. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,644 fps; across all powders the maximum-charge window runs from 1,480 fps to 2,644 fps. Accurate 4350 gives the best case fill at 100 %, and 93 of the 93 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (415 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 190.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 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, ReloadSwiss RS 52, Hodgdon LEVERevolution rank at the top here: for .308 Win. Ackley Improved with the .308 | 190gr | Hornady Sub-X 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.