Originally Posted by rscott5028
I don't know if that's a true statement.
(1) You still need a decent crown even if it's not recessed, although I prefer recessed even though you're installing a brake. Simply making a 90 degree cut would leave burrs.
(2) Gas doesn't "go everywhere" until the bullet is free of the barrel. The brake should be about .020" over sized. If the bullet touches the brake, you're screwed.
Well, you're right. I didn't really mean they just saw the barrel off and leave burrs. I guess my point is as long as the barrel is cut true to the bore, I'm not convinced the shape makes a lot of difference. I'm sure it's recessed somewhat to help prevent damage.
As far as a brake goes, the bullet is free of the bore before gas escapes, and the same goes for a muzzle with no brake. With a brake, the gas pressure exiting behind the bullet has diminished as some pressure has gone out the ports. But there is still some pressure on the base of the bullet. So everything needs to be square to keep the gas from upsetting the bullet. However, when there is no brake, it is especially necessary that everything be true and square because the full gas pressure is still bearing on the base of the bullet. I'm convinced that's why some short range benchresters really prefer flat based bullets instead of boat tails. At distances of less than 300 yds, The square base is more important than a higher ballistic coefficient. I'll climb down off the soap box now.