Load Specifications
Load data in caliber .243 WSSM with .243 | 100gr | MEN SP bullet and 95 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 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 2495 | <<locked>> | 84% | 56,043 psi | 88% | 2910 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,653 psi | 90% | 2979 fps | 98.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,995 psi | 80% | 2953 fps | 99% |
| Accurate 4064 | <<locked>> | 86% | 56,333 psi | 88% | 2966 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 57,334 psi | 90% | 3077 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 55,767 psi | 87% | 3156 fps | 96.9% |
| ADI AR 2206H | <<locked>> | 82% | 55,753 psi | 87% | 2999 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,652 psi | 89% | 2999 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,708 psi | 86% | 3058 fps | 97.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,985 psi | 88% | 3127 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 54,476 psi | 85% | 3051 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 57,638 psi | 90% | 3025 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,317 psi | 85% | 2995 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,580 psi | 90% | 3127 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,637 psi | 87% | 3107 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 57,232 psi | 90% | 3097 fps | 98% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,734 psi | 80% | 3035 fps | 97% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,863 psi | 75% | 2976 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,989 psi | 66% | 2887 fps | 98.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,158 psi | 86% | 3179 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,434 psi | 87% | 3012 fps | 100% |
| Bofors RP3 | <<locked>> | 86% | 54,636 psi | 86% | 2989 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,734 psi | 80% | 3035 fps | 97% |
| Bofors RP7 | <<locked>> | 90% | 54,404 psi | 85% | 2969 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 86% | 55,376 psi | 87% | 3005 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 55,898 psi | 88% | 3071 fps | 99% |
| Hodgdon H4350 | <<locked>> | 90% | 55,724 psi | 87% | 3028 fps | 98% |
| Hodgdon H4895 | <<locked>> | 82% | 56,347 psi | 88% | 3009 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,636 psi | 86% | 2999 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,405 psi | 88% | 3045 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 56,246 psi | 88% | 3110 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,158 psi | 57% | 1870 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,058 psi | 89% | 3005 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,898 psi | 89% | 2986 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,072 psi | 88% | 2982 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,332 psi | 87% | 2959 fps | 98.8% |
| IMR 4350 | <<locked>> | 94% | 54,926 psi | 86% | 2995 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,796 psi | 87% | 2995 fps | 98.8% |
| IMR 4831 | <<locked>> | 96% | 57,479 psi | 90% | 3061 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,753 psi | 87% | 3025 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,970 psi | 88% | 2969 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,389 psi | 85% | 2917 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,275 psi | 88% | 2976 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,811 psi | 87% | 2992 fps | 99.6% |
| Lovex S070 | <<locked>> | 94% | 57,130 psi | 90% | 3035 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,308 psi | 66% | 2795 fps | 97.4% |
| Norma 201 | <<locked>> | 84% | 57,667 psi | 90% | 2989 fps | 100% |
| Norma 202 | <<locked>> | 82% | 54,824 psi | 86% | 2933 fps | 100% |
| Norma 203B | <<locked>> | 86% | 57,014 psi | 89% | 3035 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,912 psi | 88% | 3051 fps | 97.6% |
| Norma MRPᴾ | <<locked>> | 100% | 53,882 psi | 84% | 3123 fps | 98.8% |
| Norma URP | <<locked>> | 94% | 55,767 psi | 87% | 3058 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,201 psi | 85% | 3005 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 54,650 psi | 86% | 3058 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,782 psi | 58% | 1913 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,274 psi | 87% | 2986 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,100 psi | 86% | 3064 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,042 psi | 86% | 3097 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,840 psi | 89% | 3094 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,651 psi | 87% | 3127 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 55,042 psi | 86% | 2940 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,897 psi | 86% | 2986 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,405 psi | 88% | 3025 fps | 96.7% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,623 psi | 89% | 3087 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 90% | 54,404 psi | 85% | 2969 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,811 psi | 87% | 2992 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,970 psi | 88% | 2969 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,275 psi | 88% | 2976 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 57,130 psi | 90% | 3035 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,260 psi | 88% | 3045 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,840 psi | 89% | 3002 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,493 psi | 90% | 3018 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,201 psi | 87% | 2867 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,014 psi | 88% | 2871 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,579 psi | 87% | 2940 fps | 98.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,115 psi | 88% | 3081 fps | 98% |
| Somchem S335 | <<locked>> | 82% | 54,795 psi | 86% | 2864 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,449 psi | 88% | 2986 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,665 psi | 86% | 2976 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 54,969 psi | 86% | 3061 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 57,145 psi | 90% | 3058 fps | 98.7% |
| Vihtavuori N133 | <<locked>> | 82% | 55,680 psi | 87% | 2851 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,303 psi | 87% | 2900 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,753 psi | 87% | 2917 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,246 psi | 88% | 2953 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,621 psi | 86% | 3002 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,284 psi | 77% | 2913 fps | 97.1% |
| Vihtavuori N540 | <<locked>> | 86% | 57,493 psi | 90% | 2963 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 57,116 psi | 90% | 3058 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,563 psi | 84% | 3058 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,201 psi | 85% | 2966 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,898 psi | 88% | 3071 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,192 psi | 68% | 3022 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,085 psi | 85% | 2972 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,882 psi | 84% | 2995 fps | 97.3% |
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% | 49,255 psi | 77% | 2812 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,282 psi | 74% | 2805 fps | 96.7% |
| Accurate 3100 | <<locked>> | 90% | 36,187 psi | 57% | 2661 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 46,659 psi | 73% | 2818 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,201 psi | 55% | 2657 fps | 96.9% |
| Accurate High Country | <<locked>> | 96% | 48,486 psi | 76% | 3028 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 52,083 psi | 82% | 2940 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,179 psi | 69% | 2782 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 92% | 44,788 psi | 70% | 2871 fps | 95% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,472 psi | 76% | 3002 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 45,034 psi | 71% | 2874 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,556 psi | 70% | 2812 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,601 psi | 75% | 2881 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,751 psi | 54% | 2674 fps | 97.1% |
| Alliant Reloder-17 | 38.6 gr | 80% | 39,015 psi | 61% | 2802 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 92% | 44,483 psi | 70% | 2867 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,599 psi | 70% | 2917 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,948 psi | 42% | 2461 fps | 95% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,592 psi | 54% | 2697 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 86% | 33,199 psi | 52% | 2710 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,793 psi | 81% | 2953 fps | 99.9% |
| Bofors RP3 | <<locked>> | 80% | 44,744 psi | 70% | 2818 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 44,599 psi | 70% | 2917 fps | 95.4% |
| Bofors RP7 | <<locked>> | 82% | 42,380 psi | 66% | 2743 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 45,179 psi | 71% | 2828 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 82% | 39,827 psi | 62% | 2766 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 82% | 43,149 psi | 68% | 2795 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 52,634 psi | 82% | 2949 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,097 psi | 50% | 2562 fps | 97.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,400 psi | 77% | 2933 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 42,003 psi | 66% | 2844 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,992 psi | 42% | 1670 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,415 psi | 79% | 2900 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,272 psi | 83% | 2933 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,412 psi | 73% | 2818 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,950 psi | 77% | 2851 fps | 97.8% |
| IMR 4350 | <<locked>> | 84% | 40,321 psi | 63% | 2717 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,075 psi | 64% | 2717 fps | 95.8% |
| IMR 4831 | <<locked>> | 80% | 34,069 psi | 53% | 2615 fps | 96.6% |
| IMR 4895 | <<locked>> | 80% | 48,834 psi | 77% | 2910 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 52,533 psi | 82% | 2920 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,169 psi | 80% | 2864 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,688 psi | 73% | 2822 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,508 psi | 60% | 2661 fps | 96.6% |
| Lovex S070 | <<locked>> | 82% | 39,131 psi | 61% | 2694 fps | 95.6% |
| Lovex S071 | <<locked>> | 94% | 34,867 psi | 55% | 2631 fps | 95% |
| Norma 201 | <<locked>> | 80% | 50,908 psi | 80% | 2884 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,503 psi | 81% | 2884 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,978 psi | 74% | 2867 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 45,426 psi | 71% | 2864 fps | 95.1% |
| Norma MRP | <<locked>> | 92% | 40,959 psi | 64% | 2871 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 35,143 psi | 55% | 2654 fps | 96.8% |
| Ramshot Big Game | <<locked>> | 80% | 47,166 psi | 74% | 2887 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 36,637 psi | 57% | 2700 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,615 psi | 43% | 1716 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,368 psi | 71% | 2812 fps | 97.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,213 psi | 80% | 2999 fps | 99.9% |
| ReloadSwiss RS 60 | 38.6 gr | 80% | 41,481 psi | 65% | 2861 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,998 psi | 55% | 2674 fps | 96.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 34,185 psi | 54% | 2674 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 48,588 psi | 76% | 2835 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,090 psi | 66% | 2762 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 94% | 49,719 psi | 78% | 2913 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 92% | 43,192 psi | 68% | 2841 fps | 95% |
| Rottweil R 907 | <<locked>> | 82% | 42,380 psi | 66% | 2743 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,508 psi | 60% | 2661 fps | 96.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,533 psi | 82% | 2920 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,688 psi | 73% | 2822 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 39,131 psi | 61% | 2694 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,163 psi | 68% | 2815 fps | 99.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,040 psi | 83% | 2940 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,546 psi | 79% | 2910 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,779 psi | 81% | 2818 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,642 psi | 68% | 2680 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 40,219 psi | 63% | 2657 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,701 psi | 72% | 2897 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 51,547 psi | 81% | 2815 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,721 psi | 83% | 2927 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,525 psi | 67% | 2762 fps | 99.7% |
| Somchem S365 | <<locked>> | 80% | 31,662 psi | 50% | 2608 fps | 98.8% |
| Somchem S385 | <<locked>> | 90% | 41,292 psi | 65% | 2772 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 52,301 psi | 82% | 2802 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,602 psi | 76% | 2802 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,863 psi | 77% | 2812 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,582 psi | 64% | 2694 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 36,550 psi | 57% | 2657 fps | 97.2% |
| Vihtavuori N165 | <<locked>> | 96% | 43,294 psi | 68% | 2802 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 47,195 psi | 74% | 2805 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,085 psi | 57% | 2657 fps | 96.8% |
| Vihtavuori N555 | <<locked>> | 82% | 29,486 psi | 46% | 2546 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,868 psi | 56% | 2625 fps | 99% |
| Winchester 760 | 38.8 gr | 82% | 40,118 psi | 63% | 2772 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,195 psi | 43% | 2552 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,473 psi | 79% | 2917 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,717 psi | 73% | 2871 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 95 powders for .243 WSSM loaded with the .243 | 100gr | MEN SP. Alliant Reloder-26 delivers the highest muzzle velocity at 3,179 fps; across all powders the maximum-charge window runs from 1,870 fps to 3,179 fps. Accurate 3100 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 100.0 gr projectile in 0.243" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, Alliant Reloder-19 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. Alliant Reloder-17, ReloadSwiss RS 60, Winchester 760 rank at the top here: for .243 WSSM with the .243 | 100gr | MEN SP 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.