How about 10 round groups from a button rifled chrome lined barrel?
http://i0.wp.com/www.thenewrifleman....-cold-bore.jpg
Sample size of 2, both ten round groups.
http://i0.wp.com/www.thenewrifleman....-ELD-match.jpg
The Criterion + Straight Jacket has shown tremendous accuracy potential and it is simply a button rifled barrel which is chrome lined. Those groups are from a 10x bushnell optic and my 52 Hornady ELD match loads over 25 of varget. I am sure if I had a machine rest this barrel could do better.
I was introduced to Teludyne Tech and the straight jacket by David Bailey who agreed to jacket my Criterion chrome lined barrel for T&E.
The mean radius is always smaller than the extreme spread, and is a valuable measurement. I have learned many things since first testing the Criterion and the barrel has evolved into something quite new. I would say never deal in absolutes. Chrome lined barrels are never that accurate right? This one is.
Or at least the chrome lining isnt destroying or diminishing the potential I would say.
I will agree with the satement that ammo is paramount.