For those who used threading(with or without solder) to attach barrels to a monoblock, which thread form and size did you use? On bolt action, and others, where the barrels are threaded into the receivers the thread pitch is alot more coarse than the suggested choices found in Mr Brown's book. For 12ga the suggested size and pitch is 7/8-20, I'm curious to know if you get a tighter fit with finer threads?