Are you wanting a hot core or a good even pattern? I have a Sumtoy .685 that was shooting 453 TSS9 if I recall correctly but I sent it back and he bored it to .700 to give me a more even pattern. I think a lot of 10ga shooters prefer the .700-.720 range for that reason. Look at the old threads under 10 ga pattern pics where Potter posted his results from 2018 .