I've had Ecco Machine chop and thread 3 rifles, Nick does great work and any more jobs I have will go straight back to him.
I had my Kimber Montana in 6.5 CM threaded 1/2x28. I have about 800 rds on it since then, no problems and it shoots great. Also keep in mind that a 1/2x28 thread on a .264 bore has a minor diameter to groove thickness of ~0.096", a 9/16x24 thread on a .308 bore has a very similar minor diameter to grove thickness of 0.102". For a hunting rifle, 9/16x24 is not a real problem on .308 bore, and neither is 1/2x28 on a .264 bore. When I talked to TBAC about this, their concern with smaller threads on rifle bores wasn't even about muzzle belling, it was about people falling and smacking the can on the end of the rifle hard enough to crack the barrel at the thread root.
My Kimber was cut to 20" and threaded, if I was doing it again, I'd probably go with 18".
Last edited by Gtscotty; 11/25/20.
