i recently purchased two of these barrels from jim briggs. i shot one and liked it so well i purchased a second one so i could have the first one threaded for a brake and still be able to shoot while the first barrel was being machined.ends up i never really got to shoot this barrel much as i've been working alot and the threaded barrel came back pretty quick. the barrel for sale has only been properly broke in and around 75 rds fired thru it. shoots very well netting 1/4 moa groups with my first handloads tried thru it. specs are:28" long,1-9 twist,throated for 180 bergers,yet shoots 162 hornady match bullets extremely well.bull contour,1"at the muzzle, 275.00 shipped in the lower 48.