Shallow grooves are super common for inline MLs intended for conicals or sabots. Same specs work just fine for sabots. Just take one look at Knight and White Rifles shooting records and barrel specs. Usually under .040 groove depth for 45 and .050 or less for 50cals.
I think if you actually shot MORE and read LESS stuff on the net you would have a better opinion to offer. You come up with some of the oddest claims with no first hand experience or evidence to back it up. Quality modern steel barrels will hold up to a lifetime of shooting if well cared for. My highest shot count 45 shows zero signs of any changes from a almost exclusive diet of sabotless shooting. Bullets i sized the same from day one still load with the same resistance today.
Last edited by Gm54-120; 05-17-2019 at 06:27 AM.