[I'm hoping I'll have better luck here than another site where I posted this question.....it was received with smart aleck comments like "When it's not resting on the barrel, etc...."]
I've never owned anything other than a 40mm obj. lens scope. Since I'm upping the power for the LR rifle I'm building, I'd like to know if there's a rule of thumb when I need to go to, say, a Medium height ring over Low. The OD on some of these scopes could go to 53 or 56mm. I'm just trying to avoid having to mail back the wrong size.
Thanks for any suggestions.