11 degree crown?

[kenbro]

Was wondering, does anyone know why 11degrees was decided to be optimum for a target crown?
Thanks,Ken.

[ray h]

Ken someone started winning matches and everyone copied it ''looking for the secret''.

[Bill K]

From what I gather, either the 11 degree or the recessed (floor board) crowns are the two most popular, don't really know why the 11 degree is mostly #1, just is, from what I have been told. Bill K

[TinMan]

I seem to recall that having the taper protected the bore better than a straight face, and was as easy to cut as a straight face.

[foxhunter]

supposedly the 11 degree crown allows the bullet to exit the barrel with the most consistency without the gasses tipping the bullet off axis with the least amount of variance and thus better accuracy.

[Hog Patrol]

I've seen them done recessed, radiused, 11 degrees, flat, etc.I set my muzzle ends the same as the chamber end and I've found as long as the muzzle surface is square to the bore there aren't any issues with accuracy. Have seen more than a few BR guns with flat muzzles. As far as upsetting the bullet, a brake would probably have more of an effect.

[Rick in Oregon]

This subject was covered in great detail some time back in Precision Shooting Magazine.

Laboratory tests were done with high-speed cameras that revealed the 11* crown had the least upset effect on the base of the bullet as it exited the muzzle, rendering it 'optimum' for the crown muzzle angle.

Can't prove it one bit, but my three SS Pac-Nor barreled rifles wearing this crown, all shoot bugholes. Would they with a flat crown? Dunno, but I'm not changing a thing.

Anecdotal at best, true, but results don't lie.

[kenbro]

I suppose, if it’s to do with gases escaping equally round the bullet base on exit, we would have to assume the “hole” was in the center of the barrel, at least at the end where it comes out.
Think I’ll go with Ray’s answer as that pertains to quite a lot of things that get popular when someone starts winning.
Thanks,Ken.

[coyotespotter]

I have a couple, both threaded. When I run a suppressor on them the carbon that forms on the muzzle is always evenly distributed. I use carb out to remove.

[georgeld]

Don't know the answer your looking for.

I have quite a few with the old fashioned radius type,
which I prefer. And half dozen or more recessed.

Thing I do like about the recessed is the muzzle is protected.

The major thing I Don't like about a recessed, is the sharp
edge that will cut things if and when bumped. Even a hand!
IF the very edge was beveled I'd be tickled.

Main thing is to have it flat and smooth.
Just a few of my own thoughts on the matter.