Load Specifications
Load data in caliber .30 R Blaser with .308 | 166gr | Peregrine Glider GRM 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 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.
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: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 52,170 psi | 89% | 2641 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 50,038 psi | 85% | 2654 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 50,720 psi | 86% | 2707 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 50,720 psi | 86% | 2707 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 51,401 psi | 88% | 2651 fps | 95.8% |
| Accurate 4064 | <<locked>> | 90% | 50,328 psi | 86% | 2700 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 49,951 psi | 85% | 2766 fps | 98.9% |
| ADI AR 2206H | <<locked>> | 86% | 51,576 psi | 88% | 2733 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 92% | 52,562 psi | 89% | 2730 fps | 99.4% |
| ADI Benchmark 8208 | <<locked>> | 84% | 50,720 psi | 86% | 2687 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 84% | 51,082 psi | 87% | 2671 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 51,082 psi | 87% | 2838 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 52,446 psi | 89% | 2756 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 53,098 psi | 90% | 2776 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,851 psi | 88% | 2825 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 96% | 53,055 psi | 90% | 2864 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,695 psi | 62% | 2556 fps | 97.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,828 psi | 70% | 2700 fps | 96.6% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 51,387 psi | 87% | 2743 fps | 99.1% |
| Bofors RP3 | <<locked>> | 92% | 52,562 psi | 89% | 2762 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 84% | 52,446 psi | 89% | 2674 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 49,806 psi | 85% | 2713 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 51,430 psi | 88% | 2802 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 82% | 50,633 psi | 86% | 2680 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 50,328 psi | 86% | 2720 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 94% | 51,227 psi | 87% | 2785 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 86% | 52,083 psi | 89% | 2743 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,153 psi | 82% | 2710 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 51,242 psi | 87% | 2769 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 50,517 psi | 86% | 2789 fps | 96.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,099 psi | 60% | 1699 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 52,257 psi | 89% | 2730 fps | 99.9% |
| IMR 3031 | <<locked>> | 88% | 50,357 psi | 86% | 2713 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 51,285 psi | 87% | 2703 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 92% | 50,995 psi | 87% | 2671 fps | 96.6% |
| IMR 4350 | <<locked>> | 98% | 50,169 psi | 85% | 2703 fps | 95.9% |
| IMR 4451 Enduron | <<locked>> | 94% | 52,069 psi | 89% | 2717 fps | 96.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 45,092 psi | 77% | 2667 fps | 98.2% |
| IMR 4895 | <<locked>> | 88% | 50,981 psi | 87% | 2753 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 84% | 50,720 psi | 86% | 2687 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 86% | 50,720 psi | 86% | 2707 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 51,459 psi | 88% | 2667 fps | 99.7% |
| Lovex S062 | <<locked>> | 90% | 51,663 psi | 88% | 2713 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 51,068 psi | 87% | 2707 fps | 97.9% |
| Lovex S070 | <<locked>> | 98% | 51,793 psi | 88% | 2736 fps | 97.1% |
| Norma 201 | <<locked>> | 86% | 50,256 psi | 86% | 2680 fps | 99.9% |
| Norma 202 | <<locked>> | 86% | 50,923 psi | 87% | 2690 fps | 100% |
| Norma 203B | <<locked>> | 90% | 52,272 psi | 89% | 2759 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 52,823 psi | 90% | 2808 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 90% | 52,591 psi | 90% | 2779 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,924 psi | 88% | 2802 fps | 97.8% |
| Ramshot TAC | <<locked>> | 84% | 50,952 psi | 87% | 2697 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 84% | 50,357 psi | 86% | 2717 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 82% | 51,590 psi | 88% | 2687 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,505 psi | 60% | 1739 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 50,923 psi | 87% | 2703 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 49,777 psi | 85% | 2779 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 53,011 psi | 90% | 2871 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 49,850 psi | 85% | 2785 fps | 98.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 50,067 psi | 85% | 2808 fps | 98.4% |
| Rottweil R 901 | <<locked>> | 84% | 51,068 psi | 87% | 2667 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 50,705 psi | 86% | 2680 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 52,431 psi | 89% | 2753 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 96% | 51,068 psi | 87% | 2707 fps | 97.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 50,720 psi | 86% | 2707 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 51,663 psi | 88% | 2713 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 51,793 psi | 88% | 2736 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 50,952 psi | 87% | 2762 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 52,591 psi | 90% | 2726 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 50,198 psi | 85% | 2703 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 51,967 psi | 88% | 2631 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 52,199 psi | 89% | 2631 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 51,184 psi | 87% | 2657 fps | 96.6% |
| Somchem S321 | <<locked>> | 82% | 51,576 psi | 88% | 2717 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 51,358 psi | 87% | 2631 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 52,402 psi | 89% | 2723 fps | 99.7% |
| Somchem S355 | <<locked>> | 94% | 52,982 psi | 90% | 2756 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,398 psi | 81% | 2759 fps | 100% |
| Unknown powder | <<locked>> | 96% | 50,676 psi | 86% | 2766 fps | 98.4% |
| Vihtavuori N130 | <<locked>> | 82% | 50,662 psi | 86% | 2589 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 51,793 psi | 88% | 2618 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 50,183 psi | 85% | 2651 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 50,691 psi | 86% | 2661 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 50,966 psi | 87% | 2690 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 51,271 psi | 87% | 2743 fps | 98.9% |
| Vihtavuori N530 | <<locked>> | 82% | 50,285 psi | 86% | 2694 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 50,154 psi | 85% | 2680 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 51,590 psi | 88% | 2789 fps | 98.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,653 psi | 68% | 2628 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 52,736 psi | 90% | 2740 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 51,213 psi | 87% | 2740 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 51,227 psi | 87% | 2785 fps | 96.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,663 psi | 56% | 2530 fps | 96.7% |
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% | 46,122 psi | 79% | 2556 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,247 psi | 65% | 2470 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,019 psi | 75% | 2602 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,019 psi | 75% | 2602 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 48,167 psi | 82% | 2598 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 36,172 psi | 62% | 2461 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 34,940 psi | 59% | 2487 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 42,380 psi | 72% | 2575 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 80% | 36,013 psi | 61% | 2428 fps | 96.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,527 psi | 76% | 2589 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 44,556 psi | 76% | 2582 fps | 100% |
| Alliant Power Pro 2000-MR | 50.5 gr | 80% | 38,464 psi | 65% | 2592 fps | 96.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,534 psi | 60% | 2451 fps | 97.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,130 psi | 65% | 2507 fps | 97% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,505 psi | 60% | 2503 fps | 95.4% |
| Alliant Reloder-17 | 49.8 gr | 80% | 30,632 psi | 52% | 2402 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 96% | 32,358 psi | 55% | 2451 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 38,145 psi | 65% | 2638 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,611 psi | 71% | 2575 fps | 97.4% |
| Bofors RP3 | <<locked>> | 80% | 34,751 psi | 59% | 2444 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,412 psi | 79% | 2582 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,120 psi | 73% | 2602 fps | 99.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,790 psi | 81% | 2743 fps | 99% |
| Hodgdon H322 | <<locked>> | 80% | 47,268 psi | 80% | 2628 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 38,479 psi | 66% | 2503 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 90% | 44,570 psi | 76% | 2671 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 42,786 psi | 73% | 2589 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 30,342 psi | 52% | 2346 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,564 psi | 62% | 2507 fps | 98.1% |
| Hodgdon Superformance | <<locked>> | 94% | 47,021 psi | 80% | 2726 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,034 psi | 44% | 1519 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,145 psi | 65% | 2480 fps | 98% |
| IMR 3031 | <<locked>> | 80% | 38,580 psi | 66% | 2520 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,288 psi | 60% | 2408 fps | 96.2% |
| IMR 4166 Enduron | <<locked>> | 88% | 45,324 psi | 77% | 2575 fps | 95.2% |
| IMR 4350 | <<locked>> | 96% | 46,992 psi | 80% | 2651 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 90% | 45,818 psi | 78% | 2612 fps | 95.2% |
| IMR 4831 | <<locked>> | 92% | 34,635 psi | 59% | 2461 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 39,059 psi | 66% | 2536 fps | 97.8% |
| IMR 8208 XBR | <<locked>> | 80% | 44,527 psi | 76% | 2589 fps | 99.5% |
| Lovex D073.6 | <<locked>> | 80% | 41,307 psi | 70% | 2556 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 42,670 psi | 73% | 2520 fps | 98.5% |
| Lovex S062 | <<locked>> | 80% | 37,507 psi | 64% | 2464 fps | 98.5% |
| Lovex S065 | <<locked>> | 88% | 39,581 psi | 67% | 2503 fps | 95.1% |
| Lovex S070 | <<locked>> | 94% | 45,440 psi | 77% | 2631 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 41,423 psi | 71% | 2533 fps | 99.2% |
| Norma 202 | <<locked>> | 80% | 41,887 psi | 71% | 2543 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,478 psi | 64% | 2497 fps | 97.4% |
| Norma URP | <<locked>> | 88% | 35,491 psi | 60% | 2490 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 37,086 psi | 63% | 2507 fps | 97.1% |
| Ramshot Hunter | <<locked>> | 94% | 42,641 psi | 73% | 2641 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 44,469 psi | 76% | 2589 fps | 96.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,990 psi | 75% | 2608 fps | 98.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,167 psi | 82% | 2635 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,266 psi | 45% | 1555 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 44,512 psi | 76% | 2595 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,016 psi | 68% | 2605 fps | 97.5% |
| ReloadSwiss RS 60 | 49.8 gr | 80% | 32,677 psi | 56% | 2470 fps | 98.5% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 37,420 psi | 64% | 2559 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 40,611 psi | 69% | 2628 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 45,281 psi | 77% | 2579 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,305 psi | 67% | 2484 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 80% | 32,677 psi | 56% | 2388 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 39,581 psi | 67% | 2503 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,307 psi | 70% | 2556 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 37,507 psi | 64% | 2464 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 94% | 45,440 psi | 77% | 2631 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,982 psi | 58% | 2441 fps | 96.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,656 psi | 73% | 2562 fps | 96.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,104 psi | 70% | 2546 fps | 98.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,163 psi | 73% | 2497 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,694 psi | 61% | 2365 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 44,904 psi | 76% | 2556 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 48,095 psi | 82% | 2661 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 42,540 psi | 72% | 2493 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,337 psi | 72% | 2559 fps | 98.4% |
| Somchem S355 | <<locked>> | 80% | 33,721 psi | 57% | 2402 fps | 96.7% |
| Somchem S365 | <<locked>> | 84% | 27,601 psi | 47% | 2326 fps | 95.5% |
| Unknown powder | <<locked>> | 88% | 38,885 psi | 66% | 2552 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 47,659 psi | 81% | 2543 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,480 psi | 69% | 2448 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,856 psi | 66% | 2474 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,015 psi | 66% | 2474 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 28,747 psi | 49% | 2264 fps | 96.4% |
| Vihtavuori N160 | <<locked>> | 86% | 36,274 psi | 62% | 2470 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 47,007 psi | 80% | 2641 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 38,566 psi | 66% | 2487 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 36,724 psi | 63% | 2513 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 96% | 34,664 psi | 59% | 2523 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,560 psi | 52% | 2313 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 47,659 psi | 81% | 2684 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 44,570 psi | 76% | 2671 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 98% | 30,589 psi | 52% | 2467 fps | 95.4% |
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 107 powders for .30 R Blaser loaded with the .308 | 166gr | Peregrine Glider GRM. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,871 fps; across all powders the maximum-charge window runs from 1,699 fps to 2,871 fps. Accurate 3100 gives the best case fill at 100 %, and 107 of the 107 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 166.0 gr projectile in 0.308" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-16 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, Alliant Reloder-17 rank at the top here: for .30 R Blaser with the .308 | 166gr | Peregrine Glider GRM they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 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.