Load Specifications
Load data in caliber .270 Win. with .277 | 150gr | Nosler AccuBond bullet and 94 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-17 and ReloadSwiss RS 60.
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 2495 | <<locked>> | 84% | 54,911 psi | 88% | 2657 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,347 psi | 90% | 2720 fps | 98.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,240 psi | 79% | 2700 fps | 98.9% |
| Accurate 4064 | <<locked>> | 86% | 55,013 psi | 88% | 2707 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,405 psi | 89% | 2808 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 54,476 psi | 87% | 2736 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,477 psi | 89% | 2740 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 53,098 psi | 85% | 2792 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 54,476 psi | 87% | 2858 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,999 psi | 90% | 2759 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,376 psi | 90% | 2782 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 56,362 psi | 90% | 2864 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 53,664 psi | 86% | 2835 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,550 psi | 89% | 2831 fps | 98% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 49,153 psi | 79% | 2776 fps | 96.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,485 psi | 75% | 2723 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,524 psi | 65% | 2635 fps | 98% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 53,040 psi | 85% | 2907 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 54,157 psi | 87% | 2753 fps | 100% |
| Bofors RP3 | <<locked>> | 86% | 53,214 psi | 85% | 2726 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 49,153 psi | 79% | 2776 fps | 96.9% |
| Bofors RP7 | <<locked>> | 92% | 56,318 psi | 90% | 2759 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 86% | 53,780 psi | 86% | 2743 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 92% | 54,070 psi | 87% | 2805 fps | 99% |
| Hodgdon H4350 | <<locked>> | 90% | 54,346 psi | 87% | 2766 fps | 98% |
| Hodgdon H4895 | <<locked>> | 82% | 55,056 psi | 88% | 2743 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 52,823 psi | 85% | 2736 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 55,114 psi | 88% | 2782 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 54,186 psi | 87% | 2841 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,056 psi | 58% | 1686 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 56,043 psi | 90% | 2743 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,521 psi | 89% | 2720 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,114 psi | 88% | 2723 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 54,389 psi | 87% | 2707 fps | 98.9% |
| IMR 4350 | <<locked>> | 94% | 53,882 psi | 86% | 2743 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 90% | 54,737 psi | 88% | 2736 fps | 98.9% |
| IMR 4831 | <<locked>> | 96% | 55,985 psi | 90% | 2802 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 54,534 psi | 87% | 2762 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 56,028 psi | 90% | 2776 fps | 96.3% |
| Lovex D073.6 | <<locked>> | 82% | 54,534 psi | 87% | 2707 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 53,534 psi | 86% | 2661 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,245 psi | 89% | 2720 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,679 psi | 88% | 2736 fps | 99.6% |
| Lovex S070 | <<locked>> | 94% | 55,796 psi | 89% | 2772 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,930 psi | 66% | 2552 fps | 97.3% |
| Norma 201 | <<locked>> | 82% | 53,142 psi | 85% | 2680 fps | 100% |
| Norma 202 | <<locked>> | 82% | 53,925 psi | 86% | 2680 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,593 psi | 89% | 2769 fps | 100% |
| Norma 204 | <<locked>> | 94% | 54,375 psi | 87% | 2789 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 52,170 psi | 84% | 2861 fps | 98.8% |
| Norma URP | <<locked>> | 94% | 54,288 psi | 87% | 2795 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 56,347 psi | 90% | 2795 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 53,069 psi | 85% | 2795 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,811 psi | 59% | 1729 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 53,969 psi | 87% | 2726 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 53,621 psi | 86% | 2795 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 53,330 psi | 86% | 2828 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,085 psi | 88% | 2828 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 53,867 psi | 86% | 2858 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 54,027 psi | 87% | 2684 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 53,417 psi | 86% | 2723 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 54,766 psi | 88% | 2762 fps | 96.6% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,679 psi | 88% | 2818 fps | 98% |
| Rottweil R 907 | <<locked>> | 92% | 56,318 psi | 90% | 2759 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,679 psi | 88% | 2736 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,534 psi | 87% | 2707 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,245 psi | 89% | 2720 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,796 psi | 89% | 2772 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,781 psi | 88% | 2779 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,579 psi | 89% | 2740 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,260 psi | 90% | 2756 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 54,201 psi | 87% | 2615 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,114 psi | 88% | 2621 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,549 psi | 87% | 2690 fps | 98.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,215 psi | 87% | 2815 fps | 97.9% |
| Somchem S335 | <<locked>> | 82% | 53,766 psi | 86% | 2612 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,114 psi | 88% | 2726 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 53,592 psi | 86% | 2723 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 52,924 psi | 85% | 2795 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,448 psi | 89% | 2795 fps | 98.7% |
| Vihtavuori N133 | <<locked>> | 82% | 54,679 psi | 88% | 2598 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 53,969 psi | 87% | 2641 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 54,476 psi | 87% | 2661 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,940 psi | 88% | 2700 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,434 psi | 90% | 2785 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,732 psi | 77% | 2661 fps | 97% |
| Vihtavuori N540 | <<locked>> | 86% | 55,883 psi | 90% | 2700 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,506 psi | 89% | 2795 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,895 psi | 83% | 2795 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 56,434 psi | 90% | 2762 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,404 psi | 87% | 2808 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,800 psi | 67% | 2766 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 52,924 psi | 85% | 2717 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 52,199 psi | 84% | 2736 fps | 97.2% |
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 2495 | <<locked>> | 80% | 48,283 psi | 77% | 2566 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,470 psi | 75% | 2562 fps | 96.8% |
| Accurate 3100 | <<locked>> | 90% | 35,157 psi | 56% | 2434 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 45,730 psi | 73% | 2572 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,287 psi | 55% | 2428 fps | 97.1% |
| ADI AR 2206H | <<locked>> | 80% | 51,053 psi | 82% | 2684 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,555 psi | 70% | 2546 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 92% | 43,743 psi | 70% | 2625 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,355 psi | 76% | 2740 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,613 psi | 70% | 2566 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,644 psi | 75% | 2631 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,924 psi | 54% | 2438 fps | 97.2% |
| Alliant Reloder-17 | 44.9 gr | 80% | 38,072 psi | 61% | 2559 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 92% | 43,265 psi | 69% | 2621 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 96% | 43,265 psi | 69% | 2667 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,295 psi | 42% | 2251 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 94% | 33,837 psi | 54% | 2474 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 86% | 32,082 psi | 51% | 2474 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,778 psi | 81% | 2700 fps | 99.9% |
| Bofors RP3 | <<locked>> | 80% | 43,801 psi | 70% | 2575 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 43,265 psi | 69% | 2667 fps | 95.3% |
| Bofors RP7 | <<locked>> | 82% | 41,437 psi | 66% | 2503 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 44,396 psi | 71% | 2585 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 82% | 38,812 psi | 62% | 2526 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 82% | 42,148 psi | 68% | 2552 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 51,634 psi | 83% | 2694 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,372 psi | 50% | 2339 fps | 97.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,037 psi | 77% | 2674 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 40,872 psi | 66% | 2598 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,934 psi | 43% | 1506 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,487 psi | 79% | 2648 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,185 psi | 84% | 2674 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,803 psi | 73% | 2575 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,906 psi | 77% | 2598 fps | 97.9% |
| IMR 4350 | <<locked>> | 84% | 39,233 psi | 63% | 2480 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,234 psi | 65% | 2480 fps | 95.9% |
| IMR 4831 | <<locked>> | 80% | 33,301 psi | 53% | 2388 fps | 96.8% |
| IMR 4895 | <<locked>> | 80% | 47,848 psi | 77% | 2657 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 52,837 psi | 85% | 2723 fps | 95.6% |
| Lovex D073.6 | <<locked>> | 80% | 51,053 psi | 82% | 2661 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,488 psi | 81% | 2615 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,963 psi | 74% | 2579 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,840 psi | 61% | 2434 fps | 96.8% |
| Lovex S070 | <<locked>> | 82% | 38,319 psi | 61% | 2461 fps | 95.7% |
| Lovex S071 | <<locked>> | 94% | 33,866 psi | 54% | 2405 fps | 95% |
| Norma 201 | <<locked>> | 80% | 50,067 psi | 80% | 2635 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,517 psi | 81% | 2631 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,021 psi | 74% | 2618 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 44,193 psi | 71% | 2615 fps | 95.2% |
| Norma MRP | <<locked>> | 92% | 39,653 psi | 64% | 2621 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 34,490 psi | 55% | 2428 fps | 97% |
| Ramshot Big Game | <<locked>> | 80% | 46,035 psi | 74% | 2638 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 35,607 psi | 57% | 2464 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,441 psi | 44% | 1545 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,541 psi | 71% | 2569 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,067 psi | 80% | 2740 fps | 100% |
| ReloadSwiss RS 60 | 44.9 gr | 80% | 40,495 psi | 65% | 2615 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,055 psi | 55% | 2444 fps | 96.6% |
| ReloadSwiss RS 70 | 45.6 gr | 80% | 33,402 psi | 54% | 2444 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 47,732 psi | 77% | 2589 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,307 psi | 66% | 2526 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 48,254 psi | 77% | 2657 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 92% | 42,090 psi | 67% | 2598 fps | 95% |
| Rottweil R 907 | <<locked>> | 82% | 41,437 psi | 66% | 2503 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,840 psi | 61% | 2434 fps | 96.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,053 psi | 82% | 2661 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,963 psi | 74% | 2579 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 38,319 psi | 61% | 2461 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,192 psi | 68% | 2572 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,779 psi | 83% | 2684 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,516 psi | 79% | 2654 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,024 psi | 82% | 2572 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,931 psi | 69% | 2444 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 36,927 psi | 59% | 2375 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 44,382 psi | 71% | 2648 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 50,763 psi | 81% | 2572 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,677 psi | 83% | 2677 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,727 psi | 67% | 2526 fps | 99.7% |
| Somchem S365 | <<locked>> | 80% | 30,937 psi | 50% | 2385 fps | 98.9% |
| Somchem S385 | <<locked>> | 90% | 40,045 psi | 64% | 2530 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 51,503 psi | 83% | 2556 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,732 psi | 77% | 2556 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,124 psi | 77% | 2569 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,885 psi | 64% | 2461 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 35,708 psi | 57% | 2425 fps | 97.3% |
| Vihtavuori N165 | <<locked>> | 96% | 41,974 psi | 67% | 2559 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 46,427 psi | 74% | 2566 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,360 psi | 57% | 2431 fps | 97% |
| Vihtavuori N555 | <<locked>> | 82% | 28,572 psi | 46% | 2323 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,099 psi | 56% | 2402 fps | 99% |
| Winchester 760 | <<locked>> | 82% | 39,044 psi | 63% | 2530 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,324 psi | 42% | 2329 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,603 psi | 80% | 2664 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 45,397 psi | 73% | 2625 fps | 95.7% |
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 110 powders for .270 Win. loaded with the .277 | 150gr | Nosler AccuBond. Alliant Reloder-26 delivers the highest muzzle velocity at 2,907 fps; across all powders the maximum-charge window runs from 1,686 fps to 2,907 fps. Accurate 3100 gives the best case fill at 100 %, and 110 of the 110 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.277" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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. ReloadSwiss RS 70, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .270 Win. with the .277 | 150gr | Nosler AccuBond they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, Baschieri & Pellagri 109, Bofors RP30 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.