Unlike others, I want a 5/16 in calibers up thru .40, .45 & up to some .58 I want a 3/8 some .58 & over I want a 7/16. I don't like a flimsy RR's & I don't want a tapered RR, regardless of what the old ones were. I want something I can get a hold on & it not be fragile. First thing I do when I get a blank with the RR hole drilled, is to drill it out larger, & I drill it out 1/64 to 1/32 larger than it came in.
Course I build hunting rifles, not show rifles, so they have to be durable in the woods, and I want all the wood I can get in that rod & yet it still look proportional to me.