Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 146.6gr | Sax KDG-S 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 60, Alliant Reloder-17 and Winchester 760.
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 2015 | <<locked>> | 84% | 55,303 psi | 89% | 2963 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 53,708 psi | 86% | 2979 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,072 psi | 90% | 3058 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 53,577 psi | 86% | 2979 fps | 96.1% |
| Accurate 4064 | <<locked>> | 90% | 53,925 psi | 86% | 3031 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,288 psi | 87% | 3114 fps | 99.3% |
| ADI AR 2206H | <<locked>> | 86% | 54,752 psi | 88% | 3068 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 92% | 55,883 psi | 90% | 3068 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 84% | 53,751 psi | 86% | 3018 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,375 psi | 87% | 2992 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,621 psi | 88% | 3189 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,796 psi | 89% | 3087 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 52,939 psi | 85% | 3054 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,782 psi | 89% | 3182 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 94% | 53,330 psi | 86% | 3159 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,668 psi | 64% | 2881 fps | 98.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,498 psi | 71% | 3051 fps | 97.5% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,795 psi | 88% | 3081 fps | 99.4% |
| Bofors RP3 | <<locked>> | 90% | 52,881 psi | 85% | 3048 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 53,200 psi | 85% | 3012 fps | 96.3% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,434 psi | 89% | 3002 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 52,982 psi | 85% | 3041 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,998 psi | 88% | 3146 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 90% | 53,722 psi | 86% | 3058 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 96% | 53,577 psi | 86% | 3107 fps | 97.1% |
| Hodgdon H4350 | <<locked>> | 94% | 54,360 psi | 87% | 3071 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 86% | 55,303 psi | 89% | 3081 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,866 psi | 83% | 3045 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,839 psi | 88% | 3110 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,462 psi | 87% | 3146 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,302 psi | 57% | 1903 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 53,156 psi | 85% | 3025 fps | 99.9% |
| IMR 3031 | <<locked>> | 86% | 55,143 psi | 88% | 3061 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,216 psi | 89% | 3048 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,332 psi | 89% | 3028 fps | 97.3% |
| IMR 4350 | <<locked>> | 98% | 53,534 psi | 86% | 3038 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,129 psi | 88% | 3051 fps | 97.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,853 psi | 88% | 3104 fps | 99.4% |
| IMR 4895 | <<locked>> | 88% | 54,317 psi | 87% | 3087 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 84% | 53,751 psi | 86% | 3018 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,346 psi | 87% | 3041 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,157 psi | 87% | 2992 fps | 99.8% |
| Lovex S062 | <<locked>> | 90% | 55,085 psi | 88% | 3045 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,273 psi | 87% | 3038 fps | 98.3% |
| Lovex S070 | <<locked>> | 98% | 55,245 psi | 89% | 3074 fps | 97.6% |
| Norma 201 | <<locked>> | 86% | 53,330 psi | 86% | 3009 fps | 100% |
| Norma 202 | <<locked>> | 86% | 53,969 psi | 87% | 3015 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,651 psi | 89% | 3097 fps | 99.9% |
| Norma URP | <<locked>> | 98% | 53,345 psi | 86% | 3100 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 88% | 52,736 psi | 85% | 3068 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,115 psi | 90% | 3156 fps | 98.4% |
| Ramshot TAC | <<locked>> | 84% | 54,056 psi | 87% | 3031 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 84% | 53,635 psi | 86% | 3048 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,418 psi | 87% | 3015 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,824 psi | 57% | 1949 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,201 psi | 87% | 3041 fps | 97.7% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 53,185 psi | 85% | 3120 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 52,953 psi | 85% | 3159 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,288 psi | 87% | 3140 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,940 psi | 86% | 3166 fps | 98.9% |
| Rottweil R 901 | <<locked>> | 84% | 53,911 psi | 86% | 2989 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 53,838 psi | 86% | 3009 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,434 psi | 90% | 3097 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 53,200 psi | 85% | 3012 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,273 psi | 87% | 3038 fps | 98.3% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,346 psi | 87% | 3041 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,085 psi | 88% | 3045 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,245 psi | 89% | 3074 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,795 psi | 88% | 3104 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,159 psi | 90% | 3064 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 53,113 psi | 85% | 3031 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,882 psi | 88% | 2953 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,332 psi | 89% | 2949 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,621 psi | 88% | 2989 fps | 97.2% |
| Somchem S321 | <<locked>> | 82% | 54,737 psi | 88% | 3045 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,288 psi | 87% | 2946 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,854 psi | 90% | 3058 fps | 99.8% |
| Somchem S355 | <<locked>> | 92% | 53,156 psi | 85% | 3038 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,416 psi | 82% | 3104 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 54,404 psi | 87% | 2913 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,172 psi | 88% | 2936 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 53,548 psi | 86% | 2976 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,520 psi | 87% | 2992 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,723 psi | 88% | 3018 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,086 psi | 90% | 3100 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 84% | 54,085 psi | 87% | 3015 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,173 psi | 90% | 3035 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,071 psi | 88% | 3104 fps | 99.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,482 psi | 70% | 2963 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 52,765 psi | 85% | 3022 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,128 psi | 87% | 3064 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 53,824 psi | 86% | 3110 fps | 97.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,418 psi | 57% | 2864 fps | 97.8% |
| Winchester StaBALL Match | <<locked>> | 86% | 52,953 psi | 85% | 3041 fps | 99.9% |
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 2015 | <<locked>> | 80% | 48,660 psi | 78% | 2864 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,959 psi | 66% | 2769 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,675 psi | 78% | 2940 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 50,024 psi | 80% | 2917 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 38,754 psi | 62% | 2759 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 37,971 psi | 61% | 2799 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 45,092 psi | 72% | 2890 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 80% | 38,218 psi | 61% | 2723 fps | 96.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,253 psi | 76% | 2907 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 47,500 psi | 76% | 2890 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,075 psi | 66% | 2913 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,753 psi | 61% | 2746 fps | 98% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,756 psi | 65% | 2818 fps | 97.4% |
| Alliant Reloder-16 | <<locked>> | 86% | 35,549 psi | 57% | 2753 fps | 95% |
| Alliant Reloder-17 | 58.8 gr | 80% | 32,663 psi | 52% | 2697 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 32,561 psi | 52% | 2694 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 38,421 psi | 62% | 2904 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,411 psi | 71% | 2890 fps | 97.8% |
| Bofors RP3 | <<locked>> | 80% | 37,434 psi | 60% | 2746 fps | 98% |
| Bofors RP7 | <<locked>> | 92% | 49,835 psi | 80% | 2953 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,849 psi | 78% | 2894 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,064 psi | 74% | 2920 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,184 psi | 82% | 3081 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 80% | 38,334 psi | 61% | 2753 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 92% | 46,949 psi | 75% | 2982 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 92% | 50,966 psi | 82% | 3012 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 45,542 psi | 73% | 2907 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 32,547 psi | 52% | 2638 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,669 psi | 67% | 2867 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 94% | 50,502 psi | 81% | 3074 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,237 psi | 42% | 1703 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,714 psi | 70% | 2854 fps | 98.9% |
| IMR 3031 | <<locked>> | 80% | 45,252 psi | 73% | 2904 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,089 psi | 64% | 2762 fps | 97.4% |
| IMR 4166 Enduron | <<locked>> | 82% | 45,469 psi | 73% | 2848 fps | 95% |
| IMR 4350 | <<locked>> | 96% | 50,198 psi | 80% | 2979 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 48,588 psi | 78% | 2933 fps | 95.7% |
| IMR 4831 | <<locked>> | 88% | 36,709 psi | 59% | 2749 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 41,771 psi | 67% | 2851 fps | 98.2% |
| IMR 8208 XBR | <<locked>> | 80% | 47,253 psi | 76% | 2907 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 44,222 psi | 71% | 2867 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,947 psi | 72% | 2825 fps | 98.8% |
| Lovex S062 | <<locked>> | 80% | 39,885 psi | 64% | 2766 fps | 98.8% |
| Lovex S065 | <<locked>> | 88% | 42,206 psi | 68% | 2812 fps | 95.6% |
| Lovex S070 | <<locked>> | 92% | 45,716 psi | 73% | 2900 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 43,816 psi | 70% | 2838 fps | 99.4% |
| Norma 202 | <<locked>> | 80% | 44,295 psi | 71% | 2851 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,103 psi | 64% | 2805 fps | 97.8% |
| Norma URP | <<locked>> | 88% | 38,174 psi | 61% | 2799 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 39,740 psi | 64% | 2815 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 92% | 42,772 psi | 69% | 2904 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 47,282 psi | 76% | 2907 fps | 97.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,731 psi | 75% | 2927 fps | 99% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,879 psi | 82% | 2953 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,614 psi | 43% | 1745 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 44,338 psi | 71% | 2854 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,091 psi | 69% | 2930 fps | 97.9% |
| ReloadSwiss RS 60 | 58.8 gr | 80% | 34,809 psi | 56% | 2776 fps | 98.9% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 37,797 psi | 61% | 2815 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 40,669 psi | 65% | 2890 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 47,819 psi | 77% | 2890 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,858 psi | 67% | 2789 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 80% | 35,186 psi | 56% | 2687 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 92% | 49,835 psi | 80% | 2953 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 88% | 42,206 psi | 68% | 2812 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,222 psi | 71% | 2867 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,885 psi | 64% | 2766 fps | 98.8% |
| Shooters World SW4350 | <<locked>> | 92% | 45,716 psi | 73% | 2900 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,332 psi | 58% | 2740 fps | 96.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,266 psi | 73% | 2874 fps | 97.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,613 psi | 70% | 2858 fps | 98.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,310 psi | 73% | 2799 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,695 psi | 60% | 2648 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 47,848 psi | 77% | 2871 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 51,140 psi | 82% | 2986 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,831 psi | 72% | 2795 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,179 psi | 72% | 2874 fps | 98.8% |
| Somchem S355 | <<locked>> | 80% | 35,926 psi | 58% | 2694 fps | 97.1% |
| Somchem S365 | <<locked>> | 82% | 27,847 psi | 45% | 2556 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 51,198 psi | 82% | 2864 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,716 psi | 73% | 2792 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,307 psi | 66% | 2772 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,134 psi | 68% | 2782 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,330 psi | 55% | 2628 fps | 98% |
| Vihtavuori N160 | <<locked>> | 86% | 37,405 psi | 60% | 2746 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 47,355 psi | 76% | 2900 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 40,524 psi | 65% | 2766 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 36,796 psi | 59% | 2743 fps | 95% |
| Vihtavuori N555 | <<locked>> | 94% | 35,375 psi | 57% | 2779 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 32,518 psi | 52% | 2598 fps | 96% |
| Winchester 748 | <<locked>> | 80% | 47,195 psi | 76% | 2949 fps | 100% |
| Winchester 760 | 66.2 gr | 92% | 46,949 psi | 75% | 2982 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 96% | 30,937 psi | 50% | 2717 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,134 psi | 69% | 2858 fps | 98.9% |
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 H&H Mag. loaded with the .308 | 146.6gr | Sax KDG-S. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,189 fps; across all powders the maximum-charge window runs from 1,903 fps to 3,189 fps. Alliant Reloder-16 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 57–90 %, leaving at least 10 % headroom. The 146.6 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-16, Alliant Reloder-23, Alliant Reloder-26 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 60, Alliant Reloder-17, Winchester 760 rank at the top here: for .300 H&H Mag. with the .308 | 146.6gr | Sax KDG-S 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.