Built a 20 Tactical and while it is a tac driver I have only use it on occasion for coyote hunts. Have fired 634 rounds and the throat looks great but have never fired more than 2-3 in a row. Much like my 17's, it needs cleaned often to maintain accuracy. Friends that have 20's all have custom 204's and have burnt a few barrels in short order but they also volume shoot p-dog's with theirs.
My opinion only, go with the 8 twist and Berger 55 grainers.
