I've "Heard" that,.. Lilja, Benchmark, Green Mtn, and Shilen, seem to, "Specialize" in, .22LR Barrels.
IF I wanted one of the very BEST, Centerfire Barrels, it would be,. Brux, Bartlein, or, Krieger.
Like stated above, by jscandale,.. there's BIG DEMAND for them and, they can't make em,.. fast, enough !
There's probably, a couple of small, Custom manufacturers that, guys on HERE could add to the list, tho !
Might TRY,.. a "Search" on here for, suggestions.
Brux makes, a FINE, Ctr. fire, Barrel and holds, the small Group, Record at, 600 Yards ( with a, 6 MM ).