Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 165gr | Barnes BND SPIT-FIRE 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% | 54,694 psi | 88% | 2835 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,304 psi | 90% | 2897 fps | 98.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,255 psi | 79% | 2867 fps | 98.5% |
| Accurate 4064 | <<locked>> | 86% | 54,969 psi | 88% | 2890 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,506 psi | 89% | 2989 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 82% | 54,317 psi | 87% | 2917 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,376 psi | 89% | 2920 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 52,924 psi | 85% | 2966 fps | 96.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 54,288 psi | 87% | 3041 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 56,115 psi | 90% | 2946 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,202 psi | 90% | 2963 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 56,101 psi | 90% | 3045 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 53,838 psi | 86% | 3022 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,550 psi | 89% | 3009 fps | 97.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 49,168 psi | 79% | 2946 fps | 96.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,398 psi | 74% | 2894 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,727 psi | 65% | 2799 fps | 97.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,997 psi | 85% | 3084 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 53,998 psi | 87% | 2930 fps | 99.9% |
| Bofors RP3 | <<locked>> | 86% | 53,200 psi | 85% | 2907 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 49,168 psi | 79% | 2946 fps | 96.3% |
| Bofors RP7 | <<locked>> | 92% | 56,333 psi | 90% | 2936 fps | 98.4% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,376 psi | 90% | 2943 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 53,824 psi | 86% | 2920 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 54,012 psi | 87% | 2979 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 90% | 54,201 psi | 87% | 2940 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 82% | 54,911 psi | 88% | 2927 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 56,246 psi | 90% | 2966 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,897 psi | 88% | 2959 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 54,331 psi | 87% | 3018 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,158 psi | 58% | 1824 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,898 psi | 90% | 2927 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,332 psi | 89% | 2904 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,795 psi | 88% | 2900 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 54,288 psi | 87% | 2881 fps | 98.5% |
| IMR 4350 | <<locked>> | 94% | 53,650 psi | 86% | 2913 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 90% | 54,578 psi | 88% | 2913 fps | 98.5% |
| IMR 4831 | <<locked>> | 96% | 55,680 psi | 89% | 2976 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 54,201 psi | 87% | 2943 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 54,563 psi | 87% | 2890 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 53,403 psi | 86% | 2841 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,056 psi | 88% | 2900 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,491 psi | 87% | 2910 fps | 99.4% |
| Lovex S070 | <<locked>> | 94% | 55,608 psi | 89% | 2949 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,031 psi | 66% | 2713 fps | 96.7% |
| Norma 201 | <<locked>> | 84% | 56,434 psi | 90% | 2910 fps | 100% |
| Norma 202 | <<locked>> | 82% | 53,635 psi | 86% | 2858 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,477 psi | 89% | 2949 fps | 100% |
| Norma 204 | <<locked>> | 94% | 54,317 psi | 87% | 2966 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 52,243 psi | 84% | 3035 fps | 98.3% |
| Norma URP | <<locked>> | 94% | 54,085 psi | 87% | 2972 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 52,649 psi | 84% | 2920 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 53,055 psi | 85% | 2969 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,622 psi | 59% | 1864 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 53,809 psi | 86% | 2900 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 53,505 psi | 86% | 2979 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 53,461 psi | 86% | 3015 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,245 psi | 89% | 3012 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 53,838 psi | 86% | 3035 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 53,838 psi | 86% | 2861 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 53,316 psi | 85% | 2904 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 54,737 psi | 88% | 2936 fps | 96% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,766 psi | 88% | 2995 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 92% | 56,333 psi | 90% | 2936 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,491 psi | 87% | 2910 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,563 psi | 87% | 2890 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,056 psi | 88% | 2900 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,608 psi | 89% | 2949 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,824 psi | 88% | 2959 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,564 psi | 89% | 2920 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,304 psi | 90% | 2940 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 54,041 psi | 87% | 2795 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,882 psi | 88% | 2795 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,433 psi | 87% | 2861 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,259 psi | 87% | 2992 fps | 97.4% |
| Somchem S335 | <<locked>> | 82% | 53,693 psi | 86% | 2792 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,013 psi | 88% | 2904 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 53,374 psi | 86% | 2897 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 52,866 psi | 85% | 2976 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,463 psi | 89% | 2972 fps | 98.3% |
| Vihtavuori N133 | <<locked>> | 82% | 54,520 psi | 87% | 2776 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 53,954 psi | 87% | 2825 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 54,346 psi | 87% | 2838 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,694 psi | 88% | 2874 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 52,808 psi | 85% | 2913 fps | 99.7% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,732 psi | 77% | 2828 fps | 96.4% |
| Vihtavuori N540 | <<locked>> | 86% | 55,956 psi | 90% | 2884 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,492 psi | 89% | 2972 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,996 psi | 83% | 2972 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 56,391 psi | 90% | 2940 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,273 psi | 87% | 2986 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,829 psi | 67% | 2933 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,420 psi | 90% | 2949 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 52,156 psi | 84% | 2907 fps | 96.6% |
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% | 48,066 psi | 77% | 2740 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,209 psi | 74% | 2723 fps | 96.2% |
| Accurate 3100 | <<locked>> | 92% | 37,478 psi | 60% | 2638 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 45,455 psi | 73% | 2743 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,258 psi | 55% | 2582 fps | 96.3% |
| ADI AR 2206H | <<locked>> | 80% | 51,039 psi | 82% | 2864 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,323 psi | 69% | 2707 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 94% | 46,557 psi | 75% | 2848 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,282 psi | 76% | 2917 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,468 psi | 70% | 2733 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,630 psi | 75% | 2802 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,823 psi | 54% | 2589 fps | 96.4% |
| Alliant Reloder-17 | 60 gr | 80% | 38,072 psi | 61% | 2723 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 94% | 45,992 psi | 74% | 2838 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 98% | 46,093 psi | 74% | 2884 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,905 psi | 45% | 2444 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,810 psi | 57% | 2674 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 88% | 34,345 psi | 55% | 2684 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,604 psi | 81% | 2874 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 43,671 psi | 70% | 2743 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 46,093 psi | 74% | 2884 fps | 95.4% |
| Bofors RP7 | <<locked>> | 82% | 41,220 psi | 66% | 2661 fps | 95% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,779 psi | 85% | 2890 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,150 psi | 71% | 2749 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 84% | 41,481 psi | 67% | 2746 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 84% | 44,817 psi | 72% | 2769 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 51,619 psi | 83% | 2874 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,256 psi | 50% | 2487 fps | 97.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,935 psi | 77% | 2851 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 43,642 psi | 70% | 2822 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,006 psi | 43% | 1631 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,356 psi | 79% | 2822 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,793 psi | 83% | 2854 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,556 psi | 73% | 2746 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,834 psi | 77% | 2769 fps | 97.3% |
| IMR 4350 | <<locked>> | 86% | 41,742 psi | 67% | 2690 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,161 psi | 64% | 2638 fps | 95.1% |
| IMR 4831 | <<locked>> | 80% | 33,054 psi | 53% | 2533 fps | 96% |
| IMR 4895 | <<locked>> | 80% | 47,834 psi | 77% | 2835 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 51,010 psi | 82% | 2838 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,227 psi | 81% | 2789 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,687 psi | 73% | 2743 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,623 psi | 60% | 2585 fps | 96% |
| Lovex S070 | <<locked>> | 84% | 40,770 psi | 65% | 2674 fps | 95.8% |
| Lovex S071 | <<locked>> | 96% | 36,056 psi | 58% | 2605 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 49,864 psi | 80% | 2808 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,343 psi | 81% | 2808 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,006 psi | 74% | 2792 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 47,355 psi | 76% | 2841 fps | 95.3% |
| Norma MRP | <<locked>> | 94% | 42,409 psi | 68% | 2841 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 34,142 psi | 55% | 2575 fps | 96.1% |
| Ramshot Big Game | <<locked>> | 80% | 45,992 psi | 74% | 2808 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 38,029 psi | 61% | 2677 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,325 psi | 44% | 1667 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,353 psi | 71% | 2733 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,893 psi | 80% | 2917 fps | 99.8% |
| ReloadSwiss RS 60 | 60 gr | 80% | 40,495 psi | 65% | 2785 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,866 psi | 54% | 2592 fps | 95.8% |
| ReloadSwiss RS 70 | 62.4 gr | 82% | 35,650 psi | 57% | 2654 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 47,500 psi | 76% | 2759 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,973 psi | 66% | 2684 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 51,372 psi | 82% | 2881 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 94% | 44,947 psi | 72% | 2818 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 82% | 41,220 psi | 66% | 2661 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,623 psi | 60% | 2585 fps | 96% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,010 psi | 82% | 2838 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,687 psi | 73% | 2743 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 40,770 psi | 65% | 2674 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,003 psi | 67% | 2736 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,721 psi | 83% | 2858 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,400 psi | 79% | 2828 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,937 psi | 82% | 2746 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,873 psi | 69% | 2612 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,305 psi | 63% | 2582 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 44,512 psi | 71% | 2815 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 50,517 psi | 81% | 2743 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,488 psi | 83% | 2848 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,539 psi | 67% | 2687 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 30,690 psi | 49% | 2530 fps | 98.3% |
| Somchem S385 | <<locked>> | 92% | 42,612 psi | 68% | 2743 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 51,430 psi | 82% | 2733 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,587 psi | 76% | 2730 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,747 psi | 77% | 2740 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,566 psi | 63% | 2618 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 35,665 psi | 57% | 2582 fps | 96.6% |
| Vihtavuori N165 | <<locked>> | 98% | 44,759 psi | 72% | 2772 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 46,166 psi | 74% | 2733 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,114 psi | 56% | 2579 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 84% | 30,443 psi | 49% | 2520 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,969 psi | 56% | 2552 fps | 98.5% |
| Winchester 760 | <<locked>> | 84% | 41,481 psi | 67% | 2746 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 28,050 psi | 45% | 2530 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,385 psi | 79% | 2838 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 48,515 psi | 78% | 2844 fps | 95.8% |
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 94 powders for .300 Win. Mag. loaded with the .308 | 165gr | Barnes BND SPIT-FIRE. Alliant Reloder-26 delivers the highest muzzle velocity at 3,084 fps; across all powders the maximum-charge window runs from 1,824 fps to 3,084 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 (430 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-19, 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-17, ReloadSwiss RS 60 rank at the top here: for .300 Win. Mag. with the .308 | 165gr | Barnes BND SPIT-FIRE 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.