OT again but still on the subject of backbores, Whitey PMed me asking about the minimum boreout ID for a 22LR backbore reline like Brent's. Thought the rest of you might be interested in my response.
"Whitey, my first reline job was a 30" octagon 32-40 high wall to 223 Rem. I bored the 32-cal bbl out from the breech end to a length/depth of 25", then Loctited my 24" 223 liner in place, leaving the last 5" of the original shot-out 32-cal bore in the 30" bbl.
That bbl shot very well, with the .224" bullets passing down the remaining 5" of 32-cal bore with no apparent ill effects.
I later cut that bbl to 24", not because of any accuracy issues but simply because it was too long & heavy for field use as-was. Now I wish I had left it 30", it would be an interesting demonstration piece.
Best, Joe"
