I am building a new 338 edge for myself. I ordered the brake in 30 cal a year ago when I was building a 300 rum. I went to open it up .020 over .338" and accidentally went .020 per side and now it is opened to .378”!!!. I have not tested efficiency vs. close tolerances to bullet dia. So I do not know how much I will be losing? I have just always just gone .015 to .020 over and called it good. I am not apposed to ordering another brake, but if I am not going to feel a real world difference I do not want to spend the money for nothing right now. The brake is a Holland style 3 port brake 1.25” in dia. Does anyone have any real world experience with this (Especially on the larger .338 cal.) that could offer any input? Would you just roll with it or is it worth the extra time and expense to get a new one? Thanks PS I am not real happy about this as I have thought this project through fairly well and everything has gone very smooth until now!!!