Load Specifications
Load data in caliber 6.5 x 64 Brenneke with .264 | 123gr | Fox Classic Hunter 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-16 and Alliant Reloder-26.
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 2495 | <<locked>> | 84% | 56,028 psi | 90% | 2835 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,462 psi | 87% | 2858 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,532 psi | 83% | 2887 fps | 99.1% |
| Accurate 4064 | <<locked>> | 84% | 52,939 psi | 85% | 2841 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 53,983 psi | 87% | 2946 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 55,869 psi | 90% | 2923 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 53,722 psi | 86% | 2877 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,187 psi | 88% | 2986 fps | 97.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 52,707 psi | 85% | 2992 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,578 psi | 88% | 2904 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,563 psi | 87% | 2920 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,882 psi | 88% | 3005 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 56,434 psi | 90% | 3031 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,418 psi | 87% | 2972 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,547 psi | 83% | 2969 fps | 97.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,501 psi | 78% | 2907 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,235 psi | 68% | 2818 fps | 98.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 56,173 psi | 90% | 3110 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,014 psi | 90% | 2940 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,137 psi | 76% | 2887 fps | 96.1% |
| Bofors RP3 | <<locked>> | 86% | 55,013 psi | 88% | 2913 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,547 psi | 83% | 2969 fps | 97.3% |
| Bofors RP7 | <<locked>> | 90% | 54,752 psi | 88% | 2897 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 86% | 55,564 psi | 89% | 2930 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 52,895 psi | 85% | 2943 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 90% | 56,275 psi | 90% | 2959 fps | 98.2% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 55,622 psi | 89% | 2963 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,056 psi | 88% | 2927 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 53,229 psi | 85% | 2913 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 52,837 psi | 85% | 2976 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,143 psi | 58% | 1821 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,259 psi | 87% | 2881 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 53,316 psi | 85% | 2861 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,086 psi | 90% | 2897 fps | 99% |
| IMR 4350 | <<locked>> | 94% | 55,767 psi | 89% | 2933 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 53,026 psi | 85% | 2871 fps | 98.6% |
| IMR 4831 | <<locked>> | 94% | 54,375 psi | 87% | 2936 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 56,014 psi | 90% | 2949 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,708 psi | 88% | 2913 fps | 95.9% |
| Lovex D073.6 | <<locked>> | 82% | 56,362 psi | 90% | 2894 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,824 psi | 88% | 2844 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 53,345 psi | 86% | 2854 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,376 psi | 90% | 2923 fps | 99.7% |
| Lovex S070 | <<locked>> | 92% | 54,070 psi | 87% | 2907 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,743 psi | 69% | 2730 fps | 97.6% |
| Norma 201 | <<locked>> | 82% | 54,650 psi | 88% | 2867 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,347 psi | 89% | 2861 fps | 100% |
| Norma 203B | <<locked>> | 84% | 53,867 psi | 86% | 2907 fps | 100% |
| Norma 204 | <<locked>> | 92% | 52,852 psi | 85% | 2923 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 54,984 psi | 88% | 3061 fps | 99% |
| Norma URP | <<locked>> | 92% | 52,794 psi | 85% | 2930 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 54,766 psi | 88% | 2933 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 55,245 psi | 89% | 2986 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,802 psi | 72% | 2822 fps | 96.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,869 psi | 59% | 1864 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,738 psi | 89% | 2917 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,709 psi | 89% | 2992 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,709 psi | 89% | 3025 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,012 psi | 87% | 2972 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 52,504 psi | 84% | 2992 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 55,259 psi | 89% | 2864 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,216 psi | 89% | 2910 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 53,461 psi | 86% | 2900 fps | 96.3% |
| Rottweil R 905 | <<locked>> | 98% | 53,548 psi | 86% | 2959 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 90% | 54,752 psi | 88% | 2897 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,376 psi | 90% | 2923 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,362 psi | 90% | 2894 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 53,345 psi | 86% | 2854 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,070 psi | 87% | 2907 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 53,287 psi | 85% | 2917 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,534 psi | 87% | 2894 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,521 psi | 89% | 2795 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 53,185 psi | 85% | 2756 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,275 psi | 90% | 2877 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 53,084 psi | 85% | 2953 fps | 97.6% |
| Somchem S335 | <<locked>> | 82% | 55,245 psi | 89% | 2795 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,303 psi | 89% | 2907 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 55,767 psi | 89% | 2989 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,201 psi | 87% | 2933 fps | 98.4% |
| Vihtavuori N133 | <<locked>> | 82% | 56,072 psi | 90% | 2779 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,434 psi | 89% | 2822 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,927 psi | 90% | 2841 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 53,171 psi | 85% | 2835 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,143 psi | 88% | 2930 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,009 psi | 80% | 2851 fps | 97.3% |
| Vihtavuori N540 | <<locked>> | 84% | 54,128 psi | 87% | 2838 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,259 psi | 87% | 2933 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,505 psi | 87% | 2989 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 55,390 psi | 89% | 3048 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,955 psi | 88% | 2900 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 52,895 psi | 85% | 2943 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,816 psi | 70% | 2956 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,737 psi | 88% | 2904 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,752 psi | 88% | 2933 fps | 97.6% |
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 2495 | <<locked>> | 80% | 49,124 psi | 79% | 2736 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,543 psi | 76% | 2740 fps | 97% |
| Accurate 3100 | <<locked>> | 90% | 36,347 psi | 58% | 2595 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 46,601 psi | 75% | 2740 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,346 psi | 57% | 2589 fps | 97.1% |
| ADI AR 2206H | <<locked>> | 80% | 52,678 psi | 84% | 2871 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,672 psi | 72% | 2717 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 45,295 psi | 73% | 2805 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,211 psi | 79% | 2933 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,744 psi | 72% | 2740 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,138 psi | 77% | 2812 fps | 99.8% |
| Alliant Reloder-16 | 42.3 gr | 80% | 34,751 psi | 56% | 2602 fps | 97.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,450 psi | 63% | 2733 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 44,860 psi | 72% | 2799 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,962 psi | 72% | 2848 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,919 psi | 43% | 2395 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,838 psi | 56% | 2635 fps | 95.6% |
| Alliant Reloder-26 | 50.2 gr | 86% | 33,156 psi | 53% | 2635 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,547 psi | 84% | 2887 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 44,324 psi | 71% | 2831 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 44,860 psi | 72% | 2746 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 44,962 psi | 72% | 2848 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 39,827 psi | 64% | 2615 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 45,469 psi | 73% | 2759 fps | 99% |
| Hodgdon H414 | <<locked>> | 82% | 40,190 psi | 64% | 2697 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 82% | 43,323 psi | 69% | 2726 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 51,938 psi | 83% | 2900 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,169 psi | 52% | 2493 fps | 97.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,821 psi | 80% | 2861 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 39,349 psi | 63% | 2710 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,832 psi | 43% | 1624 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,850 psi | 82% | 2828 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,963 psi | 75% | 2753 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,284 psi | 79% | 2782 fps | 98% |
| IMR 4350 | <<locked>> | 84% | 40,524 psi | 65% | 2651 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,191 psi | 66% | 2648 fps | 96% |
| IMR 4831 | <<locked>> | 80% | 34,113 psi | 55% | 2543 fps | 96.8% |
| IMR 4895 | <<locked>> | 80% | 49,385 psi | 79% | 2841 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 51,590 psi | 83% | 2861 fps | 95.2% |
| Lovex D073.6 | <<locked>> | 80% | 52,678 psi | 84% | 2844 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,721 psi | 83% | 2799 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,036 psi | 75% | 2749 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,595 psi | 62% | 2595 fps | 96.7% |
| Lovex S070 | <<locked>> | 82% | 39,392 psi | 63% | 2631 fps | 95.8% |
| Lovex S071 | <<locked>> | 94% | 34,954 psi | 56% | 2562 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 51,140 psi | 82% | 2812 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,808 psi | 83% | 2808 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,500 psi | 76% | 2799 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 46,137 psi | 74% | 2802 fps | 95.5% |
| Norma MRP | <<locked>> | 90% | 38,450 psi | 62% | 2733 fps | 95% |
| Norma URP | <<locked>> | 80% | 35,404 psi | 57% | 2589 fps | 97% |
| Ramshot Big Game | <<locked>> | 80% | 47,703 psi | 76% | 2818 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 36,782 psi | 59% | 2628 fps | 95.6% |
| Ramshot Magnum | <<locked>> | 98% | 41,684 psi | 67% | 2756 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,325 psi | 44% | 1663 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,629 psi | 73% | 2743 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,996 psi | 83% | 2933 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,032 psi | 67% | 2795 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,041 psi | 56% | 2602 fps | 96.6% |
| ReloadSwiss RS 70 | 46.3 gr | 80% | 34,418 psi | 55% | 2608 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 48,733 psi | 78% | 2766 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,322 psi | 68% | 2694 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 50,009 psi | 80% | 2841 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 92% | 43,758 psi | 70% | 2779 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 39,827 psi | 64% | 2615 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,595 psi | 62% | 2595 fps | 96.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,678 psi | 84% | 2844 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,036 psi | 75% | 2749 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 39,392 psi | 63% | 2631 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,642 psi | 70% | 2749 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,111 psi | 82% | 2841 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,228 psi | 84% | 2749 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,019 psi | 71% | 2615 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,695 psi | 60% | 2536 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 43,381 psi | 70% | 2772 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 51,837 psi | 83% | 2746 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,699 psi | 68% | 2694 fps | 99.7% |
| Somchem S365 | <<locked>> | 80% | 31,749 psi | 51% | 2539 fps | 98.9% |
| Somchem S385 | <<locked>> | 90% | 41,437 psi | 66% | 2703 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 52,823 psi | 85% | 2736 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,979 psi | 79% | 2733 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,313 psi | 79% | 2746 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,828 psi | 65% | 2625 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,883 psi | 59% | 2592 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 96% | 43,613 psi | 70% | 2733 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 47,572 psi | 76% | 2736 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,230 psi | 58% | 2589 fps | 97% |
| Vihtavuori N555 | <<locked>> | 82% | 29,530 psi | 47% | 2474 fps | 95.4% |
| Vihtavuori N560 | <<locked>> | 98% | 51,445 psi | 82% | 2979 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,158 psi | 58% | 2562 fps | 99.1% |
| Winchester 760 | <<locked>> | 82% | 40,437 psi | 65% | 2703 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,963 psi | 43% | 2477 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,981 psi | 82% | 2844 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,990 psi | 71% | 2746 fps | 95.1% |
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 6.5 x 64 Brenneke loaded with the .264 | 123gr | Fox Classic Hunter. Alliant Reloder-26 delivers the highest muzzle velocity at 3,110 fps; across all powders the maximum-charge window runs from 1,821 fps to 3,110 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 123.0 gr projectile in 0.264" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, Alliant Reloder-23 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-16, Alliant Reloder-26 rank at the top here: for 6.5 x 64 Brenneke with the .264 | 123gr | Fox Classic Hunter 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.