My ptg go / no go gauges finally arrived (they were machined 12/19) and the measurements confirmed what a custom rifle manufacturer told me; the go measures 1.71 and the no-go measures 1.714. That's about .006" that the the no-go will still close on (if the case trim is the often recommended 1.700). All load data I've seen has a case trim length of 1.70 or 1.701; winchester and starline brass typically comes at 1.701 to 1.704. Only hornady's brass comes in a "true" 1.710 length as far as I know. I wonder (not very hard) if that has any thing to do with their ammo's better sealing and consistency (scratching my bald head)?