I don’t have a Brux, Muller or Rock Creek, but I do have Bartlein, Hart, Lilja and Krieger, and I gotta day that I prefer a Krieger. They all shoot, but I like a cut barrel, and if you ever chamber a Bartlein and then a Krieger you’ll probably wonder what the heck is going on. The Krieger’s always machine freely, and an awful lot of Bartleins just don’t wanna let you cut that chamber. Krieger claims the difference is that the final crying treatment enhances machinability. Makes you wonder if they wear out easily, but I can’t say they do. Also, not all Bartleins give trouble, but it’s pretty common.Sb has given some great info. Some simple upgrades and some bedding compound and most rifles can shoot pretty well. Hand loading is another great aspect to help tune a rifle into a shooter.
Just curious what brand of barrels your buddy has looked at? Criterion are a popular barrel especially with the savage/remage crowd and do shoot well. I prefer Bartlein, Brux, muller and rock creek. More important than the barrel is the person setting it up and chambering it.