Load Specifications
Load data in caliber 7.62 x 53 R Fin. with .311 | 180gr | Lehigh Defense Match Solid 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 60 and Ramshot Big Game.
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: 27"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 88% | 50,357 psi | 89% | 2543 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 48,385 psi | 86% | 2562 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 49,777 psi | 88% | 2595 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 51,155 psi | 90% | 2651 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 51,155 psi | 90% | 2651 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 49,835 psi | 88% | 2635 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 42,047 psi | 74% | 2585 fps | 97.4% |
| Accurate LT-30 | <<locked>> | 82% | 51,010 psi | 90% | 2497 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 49,443 psi | 87% | 2628 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 96% | 50,328 psi | 89% | 2621 fps | 99.1% |
| ADI AR 2219 | <<locked>> | 82% | 50,618 psi | 89% | 2605 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 48,863 psi | 86% | 2585 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 88% | 47,877 psi | 85% | 2569 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 49,980 psi | 88% | 2680 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 48,399 psi | 86% | 2720 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 49,124 psi | 87% | 2641 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 84% | 50,357 psi | 89% | 2549 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 50,067 psi | 89% | 2657 fps | 99.2% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 42,960 psi | 76% | 2595 fps | 97.6% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 49,342 psi | 87% | 2740 fps | 99.7% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 49,647 psi | 88% | 2493 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 48,863 psi | 86% | 2638 fps | 98.6% |
| Bofors RP3 | <<locked>> | 96% | 49,095 psi | 87% | 2651 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 86% | 48,138 psi | 85% | 2530 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 90% | 50,343 psi | 89% | 2661 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 48,689 psi | 86% | 2694 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 86% | 48,617 psi | 86% | 2575 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 49,748 psi | 88% | 2605 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 50,923 psi | 90% | 2661 fps | 98.4% |
| Hodgdon H4895 | <<locked>> | 90% | 49,821 psi | 88% | 2638 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 39,059 psi | 69% | 2487 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 47,964 psi | 85% | 2661 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,229 psi | 61% | 1575 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 49,922 psi | 88% | 2621 fps | 99.6% |
| IMR 3031 | <<locked>> | 94% | 50,343 psi | 89% | 2648 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 48,921 psi | 86% | 2592 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 96% | 49,284 psi | 87% | 2559 fps | 95.8% |
| IMR 4198 | <<locked>> | 82% | 48,530 psi | 86% | 2477 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 49,806 psi | 88% | 2602 fps | 95.8% |
| IMR 4895 | <<locked>> | 92% | 47,993 psi | 85% | 2641 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 88% | 48,863 psi | 86% | 2585 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 84% | 48,138 psi | 85% | 2569 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 51,155 psi | 90% | 2651 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 50,096 psi | 89% | 2566 fps | 99.4% |
| Lovex S062 | <<locked>> | 94% | 49,066 psi | 87% | 2605 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 47,863 psi | 85% | 2585 fps | 97% |
| Norma 201 | <<locked>> | 90% | 47,964 psi | 85% | 2575 fps | 99.8% |
| Norma 202 | <<locked>> | 90% | 48,501 psi | 86% | 2585 fps | 100% |
| Norma 203B | <<locked>> | 94% | 49,182 psi | 87% | 2648 fps | 99.4% |
| Norma URPᴾ | <<locked>> | 100% | 42,815 psi | 76% | 2585 fps | 97.4% |
| Ramshot Big Game | <<locked>> | 94% | 49,545 psi | 88% | 2674 fps | 99.4% |
| Ramshot TAC | <<locked>> | 88% | 49,182 psi | 87% | 2595 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 88% | 48,124 psi | 85% | 2615 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 86% | 49,966 psi | 88% | 2585 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,389 psi | 61% | 1614 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 48,646 psi | 86% | 2575 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 48,385 psi | 86% | 2592 fps | 96.4% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 49,559 psi | 88% | 2717 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 49,371 psi | 87% | 2749 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 42,293 psi | 75% | 2605 fps | 97% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 43,801 psi | 77% | 2621 fps | 96.4% |
| Rottweil R 901 | <<locked>> | 88% | 49,110 psi | 87% | 2566 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 48,544 psi | 86% | 2575 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 98% | 48,646 psi | 86% | 2638 fps | 99.7% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 47,863 psi | 85% | 2585 fps | 97% |
| Shooters World Match Rifle | <<locked>> | 92% | 51,155 psi | 90% | 2651 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 49,066 psi | 87% | 2605 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 48,341 psi | 85% | 2543 fps | 99.6% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 50,937 psi | 90% | 2615 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 51,024 psi | 90% | 2703 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 48,370 psi | 86% | 2526 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 50,140 psi | 89% | 2615 fps | 98.1% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 51,010 psi | 90% | 2648 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 50,444 psi | 89% | 2530 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 50,082 psi | 89% | 2530 fps | 100% |
| Somchem S321 | <<locked>> | 86% | 49,603 psi | 88% | 2618 fps | 99.9% |
| Somchem S335 | <<locked>> | 90% | 49,313 psi | 87% | 2530 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 49,951 psi | 88% | 2618 fps | 99.4% |
| Somchem S355 | <<locked>> | 98% | 49,661 psi | 88% | 2638 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 37,826 psi | 67% | 2533 fps | 99.1% |
| Unknown powderᴾ | <<locked>> | 100% | 47,210 psi | 83% | 2644 fps | 97.6% |
| Vihtavuori N130 | <<locked>> | 86% | 50,488 psi | 89% | 2503 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 50,372 psi | 89% | 2520 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 50,618 psi | 89% | 2592 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 49,023 psi | 87% | 2566 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 47,906 psi | 85% | 2579 fps | 99.9% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 45,223 psi | 80% | 2585 fps | 97.7% |
| Vihtavuori N530 | <<locked>> | 88% | 49,255 psi | 87% | 2585 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 94% | 50,241 psi | 89% | 2608 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 43,918 psi | 78% | 2589 fps | 97.4% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 46,746 psi | 83% | 2579 fps | 99.4% |
| Winchester 748 | <<locked>> | 86% | 48,733 psi | 86% | 2638 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 48,617 psi | 86% | 2628 fps | 99.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 27"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 39,044 psi | 69% | 2375 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 42,264 psi | 75% | 2467 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 30,980 psi | 55% | 2283 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 36,143 psi | 64% | 2408 fps | 99.4% |
| Accurate 2520 | <<locked>> | 80% | 36,143 psi | 64% | 2408 fps | 99.4% |
| Accurate 4064 | <<locked>> | 80% | 29,341 psi | 52% | 2267 fps | 98.9% |
| Accurate 4350 | <<locked>> | 94% | 33,866 psi | 60% | 2425 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 48,022 psi | 85% | 2454 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 35,911 psi | 63% | 2382 fps | 96.9% |
| ADI AR 2208 | <<locked>> | 84% | 34,693 psi | 61% | 2339 fps | 95.7% |
| ADI AR 2219 | <<locked>> | 80% | 47,282 psi | 84% | 2556 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 37,971 psi | 67% | 2398 fps | 98.5% |
| Alliant AR-Comp | <<locked>> | 80% | 36,492 psi | 65% | 2398 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 43,801 psi | 77% | 2579 fps | 99.1% |
| Alliant Power Pro 2000-MR | 42 gr | 82% | 34,534 psi | 61% | 2434 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 29,182 psi | 52% | 2254 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 44,498 psi | 79% | 2467 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 33,924 psi | 60% | 2362 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 94% | 35,766 psi | 63% | 2444 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 86% | 31,111 psi | 55% | 2365 fps | 95.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 46,615 psi | 82% | 2451 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 34,751 psi | 61% | 2375 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 28,369 psi | 50% | 2251 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,103 psi | 71% | 2395 fps | 99.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 35,708 psi | 63% | 2408 fps | 98.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 39,262 psi | 69% | 2526 fps | 97.3% |
| Hodgdon H322 | <<locked>> | 80% | 39,987 psi | 71% | 2441 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 46,528 psi | 82% | 2559 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 36,477 psi | 64% | 2408 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 36,158 psi | 64% | 2395 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 30,443 psi | 54% | 2297 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 30,313 psi | 54% | 2310 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,411 psi | 45% | 1407 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 32,242 psi | 57% | 2290 fps | 96.2% |
| IMR 3031 | <<locked>> | 80% | 31,952 psi | 56% | 2336 fps | 99.9% |
| IMR 4064 | <<locked>> | 82% | 31,908 psi | 56% | 2270 fps | 95% |
| IMR 4166 Enduron | <<locked>> | 94% | 46,470 psi | 82% | 2513 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 45,585 psi | 81% | 2434 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 46,659 psi | 82% | 2552 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 32,605 psi | 58% | 2343 fps | 96% |
| IMR 8208 XBR | <<locked>> | 80% | 37,971 psi | 67% | 2398 fps | 98.5% |
| Lovex D073.5 | <<locked>> | 80% | 42,061 psi | 74% | 2474 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 33,707 psi | 60% | 2359 fps | 99% |
| Lovex S060 | <<locked>> | 80% | 36,854 psi | 65% | 2333 fps | 97.1% |
| Lovex S062 | <<locked>> | 80% | 31,430 psi | 56% | 2277 fps | 97% |
| Lovex S065 | <<locked>> | 94% | 39,784 psi | 70% | 2444 fps | 95% |
| Norma 201 | <<locked>> | 80% | 34,925 psi | 62% | 2339 fps | 97.9% |
| Norma 202 | <<locked>> | 80% | 34,969 psi | 62% | 2356 fps | 99.6% |
| Norma 203B | <<locked>> | 80% | 31,256 psi | 55% | 2306 fps | 95.4% |
| Norma URP | <<locked>> | 94% | 35,230 psi | 62% | 2434 fps | 95.1% |
| Ramshot Big Game | 42 gr | 82% | 32,953 psi | 58% | 2359 fps | 95.6% |
| Ramshot TAC | <<locked>> | 82% | 40,335 psi | 71% | 2441 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 36,680 psi | 65% | 2411 fps | 97.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 41,220 psi | 73% | 2441 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,425 psi | 45% | 1440 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 42,583 psi | 75% | 2477 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 45,295 psi | 80% | 2543 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 32,648 psi | 58% | 2392 fps | 95.2% |
| ReloadSwiss RS 60 | 40.4 gr | 80% | 27,311 psi | 48% | 2267 fps | 96.2% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 36,898 psi | 65% | 2500 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 40,959 psi | 72% | 2569 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 38,653 psi | 68% | 2392 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 33,286 psi | 59% | 2297 fps | 97.5% |
| Rottweil R 903 | <<locked>> | 82% | 28,500 psi | 50% | 2247 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 94% | 39,784 psi | 70% | 2444 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 33,707 psi | 60% | 2359 fps | 99% |
| Shooters World Precision | <<locked>> | 80% | 31,430 psi | 56% | 2277 fps | 97% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 45,179 psi | 80% | 2493 fps | 99.4% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 47,688 psi | 84% | 2569 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 32,155 psi | 57% | 2346 fps | 95.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 45,411 psi | 80% | 2484 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 38,043 psi | 67% | 2408 fps | 95.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 34,389 psi | 61% | 2349 fps | 96.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 36,985 psi | 65% | 2313 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,139 psi | 53% | 2188 fps | 99.3% |
| Somchem S321 | <<locked>> | 80% | 40,422 psi | 71% | 2467 fps | 99.2% |
| Somchem S335 | <<locked>> | 80% | 36,187 psi | 64% | 2316 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 35,302 psi | 62% | 2362 fps | 96.6% |
| Somchem S355 | <<locked>> | 82% | 29,849 psi | 53% | 2260 fps | 95.4% |
| Somchem S365 | <<locked>> | 90% | 27,470 psi | 49% | 2280 fps | 95.5% |
| Unknown powder | <<locked>> | 94% | 38,870 psi | 69% | 2493 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 42,090 psi | 74% | 2382 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 37,101 psi | 66% | 2316 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,126 psi | 57% | 2293 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 33,243 psi | 59% | 2300 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 80% | 26,542 psi | 47% | 2162 fps | 95.6% |
| Vihtavuori N160 | <<locked>> | 94% | 37,188 psi | 66% | 2438 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 37,695 psi | 67% | 2392 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 80% | 31,749 psi | 56% | 2287 fps | 98.9% |
| Vihtavuori N550 | <<locked>> | 94% | 36,172 psi | 64% | 2441 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 31,212 psi | 55% | 2274 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 39,436 psi | 70% | 2484 fps | 99.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,930 psi | 74% | 2520 fps | 98.8% |
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 7.62 x 53 R Fin. loaded with the .311 | 180gr | Lehigh Defense Match Solid. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,749 fps; across all powders the maximum-charge window runs from 1,575 fps to 2,749 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 (390 MPa), the top charges use 61–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.311" calls for a 1:10.5 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 60, Ramshot Big Game rank at the top here: for 7.62 x 53 R Fin. with the .311 | 180gr | Lehigh Defense Match Solid 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.