Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 170gr | Sako Powerhead Blade 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-26 and Hodgdon Superformance.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 51,663 psi | 85% | 2812 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 53,780 psi | 88% | 2887 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,662 psi | 83% | 2920 fps | 99.3% |
| Accurate 4064 | <<locked>> | 84% | 52,315 psi | 86% | 2871 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 52,953 psi | 87% | 2979 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 53,098 psi | 87% | 2910 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,375 psi | 89% | 3022 fps | 98.1% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 52,156 psi | 86% | 3012 fps | 96.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 52,040 psi | 85% | 3031 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 54,404 psi | 89% | 3022 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 53,722 psi | 88% | 2933 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 53,867 psi | 88% | 2953 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,172 psi | 89% | 3041 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 51,503 psi | 85% | 3009 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 53,606 psi | 88% | 3009 fps | 98% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,691 psi | 83% | 3009 fps | 97.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,747 psi | 78% | 2943 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,582 psi | 68% | 2858 fps | 98.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,955 psi | 90% | 3143 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,398 psi | 76% | 2927 fps | 96.6% |
| Bofors RP3 | <<locked>> | 86% | 54,302 psi | 89% | 2946 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,691 psi | 83% | 3009 fps | 97.7% |
| Bofors RP7 | <<locked>> | 90% | 53,954 psi | 89% | 2930 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 86% | 54,955 psi | 90% | 2966 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 52,054 psi | 85% | 2979 fps | 99% |
| Hodgdon H4350 | <<locked>> | 88% | 52,141 psi | 86% | 2936 fps | 98% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 54,810 psi | 90% | 2999 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,172 psi | 89% | 2956 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 52,431 psi | 86% | 2946 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 51,837 psi | 85% | 3012 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,172 psi | 59% | 1837 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 53,664 psi | 88% | 2917 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 52,547 psi | 86% | 2890 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 51,808 psi | 85% | 2871 fps | 98.8% |
| IMR 4350 | <<locked>> | 94% | 54,911 psi | 90% | 2966 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 88% | 52,460 psi | 86% | 2907 fps | 98.9% |
| IMR 4831 | <<locked>> | 94% | 53,534 psi | 88% | 2969 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 51,967 psi | 85% | 2930 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 53,983 psi | 89% | 2949 fps | 96.3% |
| Lovex S060 | <<locked>> | 82% | 54,273 psi | 89% | 2877 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 52,736 psi | 87% | 2884 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 52,199 psi | 86% | 2900 fps | 99.6% |
| Lovex S070 | <<locked>> | 92% | 53,432 psi | 88% | 2943 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,843 psi | 69% | 2762 fps | 97.9% |
| Norma 201 | <<locked>> | 82% | 53,766 psi | 88% | 2894 fps | 100% |
| Norma 202 | <<locked>> | 82% | 54,737 psi | 90% | 2894 fps | 100% |
| Norma 203B | <<locked>> | 84% | 53,171 psi | 87% | 2940 fps | 100% |
| Norma 204 | <<locked>> | 92% | 51,996 psi | 85% | 2959 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 53,896 psi | 88% | 3097 fps | 99.3% |
| Norma URP | <<locked>> | 92% | 52,098 psi | 86% | 2966 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,085 psi | 89% | 2966 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 49,487 psi | 81% | 2989 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 94% | 54,360 psi | 89% | 3018 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,135 psi | 72% | 2861 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,593 psi | 60% | 1877 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 54,882 psi | 90% | 2946 fps | 99.5% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 54,766 psi | 90% | 3022 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,824 psi | 90% | 3058 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 52,852 psi | 87% | 3002 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 51,663 psi | 85% | 3028 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 40,495 psi | 66% | 2871 fps | 96.6% |
| Rottweil R 902 | <<locked>> | 84% | 54,505 psi | 89% | 2894 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,433 psi | 89% | 2943 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 52,823 psi | 87% | 2940 fps | 96.7% |
| Rottweil R 905 | <<locked>> | 98% | 52,794 psi | 87% | 2995 fps | 98% |
| Rottweil R 907 | <<locked>> | 90% | 53,954 psi | 89% | 2930 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 90% | 52,199 psi | 86% | 2900 fps | 99.6% |
| Shooters World Precision | <<locked>> | 84% | 52,736 psi | 87% | 2884 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 53,432 psi | 88% | 2943 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 52,707 psi | 87% | 2953 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 53,751 psi | 88% | 2927 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 54,998 psi | 90% | 2828 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 52,562 psi | 86% | 2782 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 51,967 psi | 85% | 2851 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 52,315 psi | 86% | 2989 fps | 97.9% |
| Somchem S335 | <<locked>> | 82% | 54,418 psi | 89% | 2822 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,549 psi | 90% | 2940 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 54,331 psi | 89% | 2927 fps | 96.2% |
| Somchem S365 | <<locked>> | 96% | 54,708 psi | 90% | 3022 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 53,345 psi | 88% | 2969 fps | 98.7% |
| Vihtavuori N135 | <<locked>> | 84% | 54,911 psi | 90% | 2854 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 51,880 psi | 85% | 2822 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 52,417 psi | 86% | 2864 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,215 psi | 89% | 2959 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,240 psi | 81% | 2887 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 84% | 53,548 psi | 88% | 2871 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 53,345 psi | 88% | 2966 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,243 psi | 87% | 3022 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 54,389 psi | 89% | 3084 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,085 psi | 89% | 2930 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 52,054 psi | 85% | 2979 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,975 psi | 71% | 2995 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 53,795 psi | 88% | 2933 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,737 psi | 88% | 2966 fps | 97.9% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 48,428 psi | 80% | 2766 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,978 psi | 77% | 2772 fps | 97.3% |
| Accurate 3100 | <<locked>> | 88% | 33,272 psi | 55% | 2572 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 45,876 psi | 75% | 2769 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,650 psi | 57% | 2625 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 80% | 44,121 psi | 72% | 2753 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 90% | 41,785 psi | 69% | 2785 fps | 95% |
| ADI AR 2213 | <<locked>> | 98% | 48,675 psi | 80% | 2946 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,370 psi | 79% | 2966 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 41,698 psi | 68% | 2782 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,193 psi | 73% | 2772 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,369 psi | 78% | 2844 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,374 psi | 56% | 2641 fps | 97.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,841 psi | 64% | 2772 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 41,220 psi | 68% | 2772 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 94% | 41,263 psi | 68% | 2822 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,382 psi | 43% | 2431 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 92% | 32,053 psi | 53% | 2612 fps | 95.1% |
| Alliant Reloder-26 | 66.4 gr | 84% | 30,356 psi | 50% | 2612 fps | 95.3% |
| Bofors RP15 | <<locked>> | 98% | 43,352 psi | 71% | 2864 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 44,222 psi | 73% | 2782 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 41,263 psi | 68% | 2822 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 39,189 psi | 64% | 2648 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 44,933 psi | 74% | 2795 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 80% | 36,883 psi | 61% | 2674 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 82% | 42,728 psi | 70% | 2759 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 98% | 51,097 psi | 84% | 2936 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,749 psi | 52% | 2530 fps | 98.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,037 psi | 81% | 2890 fps | 100% |
| Hodgdon Superformance | 66.8 gr | 82% | 38,638 psi | 63% | 2746 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,876 psi | 44% | 1640 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,227 psi | 82% | 2861 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,398 psi | 76% | 2785 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,733 psi | 80% | 2815 fps | 98.3% |
| IMR 4350 | <<locked>> | 84% | 39,914 psi | 66% | 2687 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,785 psi | 67% | 2684 fps | 96.5% |
| IMR 4831 | <<locked>> | 80% | 33,504 psi | 55% | 2579 fps | 97.2% |
| IMR 4895 | <<locked>> | 80% | 48,602 psi | 80% | 2874 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 50,807 psi | 83% | 2894 fps | 95.6% |
| Lovex S060 | <<locked>> | 80% | 51,097 psi | 84% | 2828 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,369 psi | 76% | 2782 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,072 psi | 63% | 2628 fps | 97.2% |
| Lovex S070 | <<locked>> | 80% | 36,390 psi | 60% | 2608 fps | 95.5% |
| Lovex S071 | <<locked>> | 94% | 34,229 psi | 56% | 2595 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 50,517 psi | 83% | 2844 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,198 psi | 84% | 2841 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,746 psi | 77% | 2831 fps | 100% |
| Norma 204 | <<locked>> | 86% | 42,322 psi | 69% | 2776 fps | 95.1% |
| Norma MRP | <<locked>> | 90% | 37,782 psi | 62% | 2772 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 34,882 psi | 57% | 2625 fps | 97.5% |
| Ramshot Big Game | <<locked>> | 80% | 46,934 psi | 77% | 2851 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 46,064 psi | 76% | 2920 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 33,750 psi | 55% | 2605 fps | 95.2% |
| Ramshot Magnum | <<locked>> | 98% | 40,843 psi | 67% | 2792 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,325 psi | 45% | 1680 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,121 psi | 74% | 2779 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,126 psi | 84% | 2966 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,365 psi | 68% | 2828 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,519 psi | 57% | 2641 fps | 97.2% |
| ReloadSwiss RS 70 | 62.6 gr | 80% | 33,823 psi | 56% | 2648 fps | 96.4% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 37,666 psi | 62% | 2795 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 48,167 psi | 79% | 2795 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,727 psi | 69% | 2726 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 46,354 psi | 76% | 2822 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 92% | 43,033 psi | 71% | 2815 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 39,189 psi | 64% | 2648 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,072 psi | 63% | 2628 fps | 97.2% |
| Shooters World Precision | <<locked>> | 80% | 46,369 psi | 76% | 2782 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 36,390 psi | 60% | 2608 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,917 psi | 70% | 2782 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,372 psi | 83% | 2871 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,634 psi | 85% | 2779 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,468 psi | 71% | 2641 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,246 psi | 61% | 2572 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 42,627 psi | 70% | 2808 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 51,242 psi | 84% | 2776 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,119 psi | 69% | 2726 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 50,850 psi | 83% | 2871 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 31,270 psi | 51% | 2579 fps | 99.2% |
| Somchem S385 | <<locked>> | 88% | 38,174 psi | 63% | 2680 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 48,312 psi | 79% | 2759 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,762 psi | 80% | 2776 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,306 psi | 66% | 2657 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,245 psi | 60% | 2625 fps | 97.8% |
| Vihtavuori N165 | <<locked>> | 94% | 40,205 psi | 66% | 2713 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 47,007 psi | 77% | 2769 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,708 psi | 59% | 2625 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 82% | 28,921 psi | 47% | 2513 fps | 96% |
| Vihtavuori N560 | <<locked>> | 98% | 50,560 psi | 83% | 3018 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,636 psi | 59% | 2598 fps | 99.4% |
| Winchester 760 | <<locked>> | 80% | 37,043 psi | 61% | 2677 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 84% | 24,787 psi | 41% | 2454 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,357 psi | 83% | 2877 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,395 psi | 71% | 2782 fps | 95.6% |
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 94 powders for .300 Blaser Mag. loaded with the .308 | 170gr | Sako Powerhead Blade. Alliant Reloder-26 delivers the highest muzzle velocity at 3,143 fps; across all powders the maximum-charge window runs from 1,837 fps to 3,143 fps. Accurate 3100 gives the best case fill at 100 %, and 94 of the 94 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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-26, Hodgdon Superformance rank at the top here: for .300 Blaser Mag. with the .308 | 170gr | Sako Powerhead Blade 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.