Load Specifications
Load data in caliber .300 CR with .308 | 180gr | A-Square DeadTough 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, Hodgdon CFE223 and ReloadSwiss RS 52.
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>> | 92% | 55,564 psi | 89% | 2500 fps | 100% |
| Accurate 2200 | <<locked>> | 84% | 56,318 psi | 90% | 2589 fps | 98.9% |
| Accurate 2230 | <<locked>> | 82% | 53,519 psi | 86% | 2549 fps | 98.9% |
| Accurate 2460 | <<locked>> | 88% | 54,230 psi | 87% | 2526 fps | 100% |
| Accurate 2495 | <<locked>> | 98% | 55,506 psi | 89% | 2549 fps | 100% |
| Accurate 2520 | <<locked>> | 92% | 55,259 psi | 89% | 2575 fps | 100% |
| Accurate 4064ᴾ | <<locked>> | 100% | 54,998 psi | 88% | 2585 fps | 100% |
| Accurate LT-30 | <<locked>> | 86% | 56,188 psi | 90% | 2454 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 53,563 psi | 86% | 2434 fps | 100% |
| ADI AR 2206H | <<locked>> | 94% | 54,520 psi | 87% | 2579 fps | 99.3% |
| ADI AR 2207 | <<locked>> | 82% | 54,433 psi | 87% | 2431 fps | 100% |
| ADI AR 2208ᴾ | <<locked>> | 100% | 55,477 psi | 89% | 2572 fps | 98.9% |
| ADI AR 2219 | <<locked>> | 84% | 52,982 psi | 85% | 2523 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 54,041 psi | 87% | 2539 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 92% | 53,258 psi | 85% | 2526 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 88% | 55,347 psi | 89% | 2635 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 53,954 psi | 87% | 2674 fps | 98.7% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 54,331 psi | 87% | 2592 fps | 99.7% |
| Alliant Reloder-10x | <<locked>> | 88% | 55,738 psi | 89% | 2510 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 98% | 55,274 psi | 89% | 2608 fps | 99.1% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 48,153 psi | 77% | 2589 fps | 98.9% |
| Alliant Reloder-7 | <<locked>> | 82% | 55,434 psi | 89% | 2451 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 55,317 psi | 89% | 2457 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 54,114 psi | 87% | 2589 fps | 98.5% |
| Bofors RP3ᴾ | <<locked>> | 100% | 54,534 psi | 87% | 2605 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 90% | 53,243 psi | 85% | 2487 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 94% | 55,840 psi | 90% | 2615 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 90% | 54,041 psi | 87% | 2648 fps | 99% |
| Hodgdon H322 | <<locked>> | 88% | 54,940 psi | 88% | 2546 fps | 100% |
| Hodgdon H335 | <<locked>> | 88% | 55,927 psi | 90% | 2572 fps | 100% |
| Hodgdon H380ᴾ | <<locked>> | 100% | 56,217 psi | 90% | 2612 fps | 98.2% |
| Hodgdon H4198 | <<locked>> | 82% | 54,926 psi | 88% | 2454 fps | 100% |
| Hodgdon H4895 | <<locked>> | 94% | 54,926 psi | 88% | 2589 fps | 99.6% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 38,116 psi | 61% | 2346 fps | 96.6% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 53,156 psi | 85% | 2615 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,185 psi | 55% | 1503 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 53,272 psi | 85% | 2549 fps | 99.4% |
| IMR 3031 | <<locked>> | 94% | 53,780 psi | 86% | 2579 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 54,839 psi | 88% | 2556 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 96% | 56,130 psi | 90% | 2536 fps | 95.9% |
| IMR 4198 | <<locked>> | 88% | 56,420 psi | 90% | 2470 fps | 100% |
| IMR 4895 | <<locked>> | 96% | 53,142 psi | 85% | 2592 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 92% | 54,041 psi | 87% | 2539 fps | 99.8% |
| Lovex D073.4 | <<locked>> | 82% | 54,230 psi | 87% | 2533 fps | 100% |
| Lovex D073.5 | <<locked>> | 88% | 54,244 psi | 87% | 2536 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 53,214 psi | 85% | 2559 fps | 100% |
| Lovex S060 | <<locked>> | 94% | 55,361 psi | 89% | 2520 fps | 99.3% |
| Lovex S062 | <<locked>> | 98% | 54,041 psi | 87% | 2552 fps | 99.8% |
| Norma 200 | <<locked>> | 84% | 55,680 psi | 89% | 2484 fps | 100% |
| Norma 201 | <<locked>> | 94% | 53,301 psi | 85% | 2533 fps | 99.8% |
| Norma 202 | <<locked>> | 94% | 53,447 psi | 86% | 2539 fps | 100% |
| Norma 203B | <<locked>> | 98% | 54,317 psi | 87% | 2598 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 98% | 54,578 psi | 88% | 2621 fps | 99.2% |
| Ramshot TAC | <<locked>> | 92% | 54,665 psi | 88% | 2549 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 92% | 53,403 psi | 86% | 2569 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 90% | 55,564 psi | 89% | 2546 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,461 psi | 55% | 1542 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 53,954 psi | 87% | 2533 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 53,534 psi | 86% | 2543 fps | 96.1% |
| ReloadSwiss RS 52 | <<locked>> | 96% | 54,853 psi | 88% | 2667 fps | 99.1% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 51,430 psi | 82% | 2651 fps | 100% |
| Rottweil R 901 | <<locked>> | 92% | 54,578 psi | 88% | 2523 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 53,693 psi | 86% | 2530 fps | 99.8% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 50,502 psi | 81% | 2543 fps | 99.3% |
| Shooters World AR Plus | <<locked>> | 82% | 54,230 psi | 87% | 2533 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 94% | 53,214 psi | 85% | 2559 fps | 100% |
| Shooters World Precision | <<locked>> | 98% | 54,041 psi | 87% | 2552 fps | 99.8% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 53,983 psi | 87% | 2503 fps | 99.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 54,085 psi | 87% | 2195 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 53,142 psi | 85% | 2530 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 52,460 psi | 84% | 2598 fps | 99% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 53,606 psi | 86% | 2487 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 94% | 56,318 psi | 90% | 2579 fps | 98.1% |
| SNPE Vectan SP 9 | <<locked>> | 96% | 56,347 psi | 90% | 2598 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 55,796 psi | 89% | 2484 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 55,187 psi | 88% | 2480 fps | 100% |
| Somchem S321 | <<locked>> | 90% | 55,347 psi | 89% | 2579 fps | 99.9% |
| Somchem S335 | <<locked>> | 94% | 54,607 psi | 88% | 2487 fps | 100% |
| Somchem S341 | <<locked>> | 94% | 55,477 psi | 89% | 2572 fps | 99.3% |
| Somchem S355ᴾ | <<locked>> | 100% | 51,445 psi | 82% | 2543 fps | 99.3% |
| Somchem S365ᴾ | <<locked>> | 100% | 36,825 psi | 59% | 2385 fps | 97.8% |
| Vihtavuori N120 | <<locked>> | 82% | 54,360 psi | 87% | 2385 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 55,579 psi | 89% | 2457 fps | 100% |
| Vihtavuori N133 | <<locked>> | 94% | 55,463 psi | 89% | 2474 fps | 100% |
| Vihtavuori N135 | <<locked>> | 98% | 55,492 psi | 89% | 2539 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 53,838 psi | 86% | 2516 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 49,748 psi | 80% | 2487 fps | 99.7% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 43,947 psi | 70% | 2441 fps | 96.1% |
| Vihtavuori N530 | <<locked>> | 92% | 54,810 psi | 88% | 2543 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 98% | 55,376 psi | 89% | 2559 fps | 100% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 45,382 psi | 73% | 2434 fps | 98.3% |
| Winchester 748 | <<locked>> | 92% | 53,214 psi | 85% | 2582 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 96% | 55,840 psi | 90% | 2608 fps | 99.7% |
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% | 38,450 psi | 62% | 2257 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 49,400 psi | 79% | 2487 fps | 98% |
| Accurate 2230 | <<locked>> | 80% | 49,763 psi | 80% | 2497 fps | 98.4% |
| Accurate 2460 | <<locked>> | 80% | 41,437 psi | 66% | 2339 fps | 99.7% |
| Accurate 2495 | <<locked>> | 80% | 30,937 psi | 50% | 2172 fps | 99.8% |
| Accurate 2520 | <<locked>> | 80% | 36,811 psi | 59% | 2293 fps | 98.8% |
| Accurate 4064 | <<locked>> | 80% | 29,283 psi | 47% | 2149 fps | 97.9% |
| Accurate LT-30 | <<locked>> | 80% | 46,862 psi | 75% | 2329 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 47,239 psi | 76% | 2346 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 80% | 35,360 psi | 57% | 2251 fps | 95.4% |
| ADI AR 2207 | <<locked>> | 80% | 51,010 psi | 82% | 2392 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 38,566 psi | 62% | 2300 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 46,137 psi | 74% | 2428 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 37,318 psi | 60% | 2270 fps | 97.4% |
| Alliant AR-Comp | <<locked>> | 80% | 35,694 psi | 57% | 2277 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 42,873 psi | 69% | 2441 fps | 98.2% |
| Alliant Power Pro 2000-MR | 41.8 gr | 88% | 41,321 psi | 66% | 2454 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 32,677 psi | 52% | 2221 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 43,613 psi | 70% | 2343 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 37,840 psi | 61% | 2326 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 90% | 34,751 psi | 56% | 2326 fps | 95.2% |
| Alliant Reloder-7 | <<locked>> | 80% | 52,083 psi | 84% | 2408 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 45,701 psi | 73% | 2333 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 38,899 psi | 62% | 2343 fps | 95.2% |
| Bofors RP3 | <<locked>> | 84% | 32,111 psi | 51% | 2224 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 39,378 psi | 63% | 2267 fps | 98.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 34,983 psi | 56% | 2277 fps | 97.4% |
| Hodgdon CFE223 | 38.9 gr | 80% | 38,522 psi | 62% | 2385 fps | 95.8% |
| Hodgdon H322 | <<locked>> | 80% | 42,206 psi | 68% | 2365 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 42,815 psi | 69% | 2385 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 92% | 43,337 psi | 69% | 2418 fps | 95.7% |
| Hodgdon H4198 | <<locked>> | 80% | 51,547 psi | 83% | 2411 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 35,592 psi | 57% | 2264 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 33,794 psi | 54% | 2254 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 31,691 psi | 51% | 2221 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,367 psi | 41% | 1342 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 34,142 psi | 55% | 2218 fps | 95.6% |
| IMR 3031 | <<locked>> | 80% | 34,185 psi | 55% | 2274 fps | 99.8% |
| IMR 4064 | <<locked>> | 86% | 37,971 psi | 61% | 2283 fps | 95.7% |
| IMR 4166 Enduron | <<locked>> | 94% | 52,779 psi | 85% | 2490 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 44,744 psi | 72% | 2320 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 34,214 psi | 55% | 2260 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 37,318 psi | 60% | 2270 fps | 97.4% |
| Lovex D073.4 | <<locked>> | 80% | 50,459 psi | 81% | 2484 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 41,394 psi | 66% | 2346 fps | 99% |
| Lovex D073.6 | <<locked>> | 80% | 33,112 psi | 53% | 2231 fps | 98% |
| Lovex S060 | <<locked>> | 80% | 36,376 psi | 58% | 2208 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 31,111 psi | 50% | 2152 fps | 95.5% |
| Norma 200 | <<locked>> | 80% | 49,371 psi | 79% | 2405 fps | 100% |
| Norma 201 | <<locked>> | 80% | 34,664 psi | 56% | 2215 fps | 96.7% |
| Norma 202 | <<locked>> | 80% | 34,548 psi | 55% | 2231 fps | 98.8% |
| Norma 203B | <<locked>> | 84% | 34,795 psi | 56% | 2267 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 86% | 36,782 psi | 59% | 2323 fps | 95.5% |
| Ramshot TAC | <<locked>> | 86% | 44,976 psi | 72% | 2402 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 35,926 psi | 58% | 2277 fps | 95.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 40,509 psi | 65% | 2310 fps | 96.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,440 psi | 41% | 1371 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 41,930 psi | 67% | 2349 fps | 99.3% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 50,299 psi | 81% | 2497 fps | 95.5% |
| ReloadSwiss RS 52 | 38.7 gr | 84% | 36,753 psi | 59% | 2362 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 28,616 psi | 46% | 2178 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 38,319 psi | 61% | 2267 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 80% | 33,025 psi | 53% | 2172 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 86% | 31,995 psi | 51% | 2215 fps | 95.2% |
| Shooters World AR Plus | <<locked>> | 80% | 50,459 psi | 81% | 2484 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 80% | 33,112 psi | 53% | 2231 fps | 98% |
| Shooters World Precision | <<locked>> | 80% | 31,111 psi | 50% | 2152 fps | 95.5% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 44,251 psi | 71% | 2359 fps | 98.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 51,474 psi | 83% | 2165 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 46,644 psi | 75% | 2438 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 35,853 psi | 57% | 2310 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 44,324 psi | 71% | 2359 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 42,685 psi | 68% | 2375 fps | 95.3% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 35,969 psi | 58% | 2267 fps | 95.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 36,347 psi | 58% | 2192 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 29,631 psi | 48% | 2070 fps | 98.4% |
| Somchem S321 | <<locked>> | 80% | 39,682 psi | 64% | 2336 fps | 98.3% |
| Somchem S335 | <<locked>> | 80% | 35,853 psi | 57% | 2198 fps | 99.5% |
| Somchem S341 | <<locked>> | 80% | 34,664 psi | 56% | 2231 fps | 95% |
| Somchem S355 | <<locked>> | 86% | 33,359 psi | 53% | 2228 fps | 95.4% |
| Somchem S365 | <<locked>> | 94% | 30,777 psi | 49% | 2244 fps | 95.4% |
| Vihtavuori N120 | <<locked>> | 80% | 50,966 psi | 82% | 2346 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 41,307 psi | 66% | 2264 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 36,361 psi | 58% | 2198 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 31,517 psi | 51% | 2172 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 80% | 32,648 psi | 52% | 2175 fps | 98.7% |
| Vihtavuori N150 | <<locked>> | 84% | 29,660 psi | 48% | 2126 fps | 95.5% |
| Vihtavuori N160 | <<locked>> | 98% | 41,234 psi | 66% | 2392 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 37,159 psi | 60% | 2264 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 80% | 31,169 psi | 50% | 2159 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 34,896 psi | 56% | 2238 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 35,607 psi | 57% | 2293 fps | 97.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 32,822 psi | 53% | 2221 fps | 95.2% |
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 117 powders for .300 CR loaded with the .308 | 180gr | A-Square DeadTough. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,674 fps; across all powders the maximum-charge window runs from 1,503 fps to 2,674 fps. Accurate 4064 gives the best case fill at 100 %, and 117 of the 117 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 47–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 4064, Accurate 4350, ADI AR 2208 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 CFE223, ReloadSwiss RS 52 rank at the top here: for .300 CR with the .308 | 180gr | A-Square DeadTough they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Alliant Reloder-23, Bofors RP7 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.