Dave, point well taken. That is one reason why I was considering doing a backyard test with string on the triggers to bring the pressures up to the point that is comfortable to me. Problem is I won't be able to measure the minute changes in barrel expansion, if any. Also, depending on the cost at HP White, I may just buy the tool from midway and measure the bore wall thickness myself. As of this morning no reply from White, but it is still early yet.