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Crown preference

Fern

Silver $$ Contributor
What type of crown do you like on your rifles?
Had a pac nor barrel put on my cz204 with a recessed crown to try and keep it “stockish”.
My next project is a 20 vartarg and thinking of doing target crown.
Just trying to see what type you folks prefer and any particular reason
 
Fern said:
What type of crown do you like on your rifles?
Had a pac nor barrel put on my cz204 with a recessed crown to try and keep it “stockish”.
My next project is a 20 vartarg and thinking of doing target crown.
Just trying to see what type you folks prefer and any particular reason
Click to expand...
With no Muzzle brake:
I "LIKE" recessed 11 deg
But recessed 90 deg is just as good
___________________________________________
with muzzle brake, I prefer no recess to be able to clean the carbon off the muzzle easier
 
I normally use the 11 degree. Last 2 barrels I cut flat with a little recess.
These barrels were due for a touch up. Targets showed no difference.
Joking around, I had taken a long in the tooth burner to make another
mule barrel for one of my cat's. I cut the crown to a 45 degree funnel.
Shot pretty good considering.....LOL......I was once told by an old timer
that flat base bullets preferred a flat crown. I never sat at the bench to
prove it out since I was mostly shooting longer ranges with boat tails.
 
Years ago a couple of guys had a M70 30-06 with a 28 inch barrel and wanted to see the velocity drop by removing an inch at a time, didn't care about accuracy but they recorded it. They got tired of removing the barrel to cut a crown with a lath, so they just wacked it off with a hack saw and squared it up, no crown. In the end one of the most accurate lengths was around 17 inch and they didn't even square the muzzle. In my limited experience, I cut the barrel and square the muzzle and line up the bore and then cut a recess with a 45 degree cutter (to keep from dinging the muzzle). I have yet to make a barrel shoot worse. I am not building BR barrels, but like .5 MOA.
 
Lately, 11 degree full face. I had barrels done by "Stick" at S&S Precision back in the day that the muzzle face was flat with about an 1/8" 45 degree recess around to bore. Was a very clean look but performed very well. Now, I'm speaking of competition platforms. On my tactical platforms where no muzzle brake is used, a semi-deep recess to protect from portability.
 
Over the years the 11* crown, recessed or not has proven to be the best crown angle for escaping muzzle gas in regard to upset at the bullet base and will give the best possible accuracy with the least gas disturbance on the bullet, either flat base or boatail.

This subject was discussed for at least three years in Precision Shooting, with the consensus above being the most trusted/recognized from actual experiments and anecdotal evidence from many top-tier shooters.
 
Rick in Oregon said:
Over the years the 11* crown, recessed or not has proven to be the best crown angle for escaping muzzle gas in regard to upset at the bullet base and will give the best possible accuracy with the least gas disturbance on the bullet, either flat base or boatail.

This subject was discussed for at least three years in Precision Shooting, with the consensus above being the most trusted/recognized from actual experiments and anecdotal evidence from many top-tier shooters.
Click to expand...
Was there any data on what the difference was between a recessed and 11 degree crown?
 
jelenko said:
Was there any data on what the difference was between a recessed and 11 degree crown?
Click to expand...
Perhaps I missed the purpose of this rifle, but is this a carry gun or will it be shot off a rest? If carry, you'll want to protect what ever crown you decide on. If off a rest, 11-deg target crown all day long!
 
bsekf said:
Years ago a couple of guys had a M70 30-06 with a 28 inch barrel and wanted to see the velocity drop by removing an inch at a time, didn't care about accuracy but they recorded it. They got tired of removing the barrel to cut a crown with a lath, so they just wacked it off with a hack saw and squared it up, no crown. In the end one of the most accurate lengths was around 17 inch and they didn't even square the muzzle. In my limited experience, I cut the barrel and square the muzzle and line up the bore and then cut a recess with a 45 degree cutter (to keep from dinging the muzzle). I have yet to make a barrel shoot worse. I am not building BR barrels, but like .5 MOA.
Click to expand...
What a fireball.
 
boltfluter said:
A flat crown will be more tolerant of a barrel that is not dialed in perfect. Just something to consider.
Paul
Click to expand...
Curious as to why this would be true. I've had 3 long range benchrest barrels that were square cut and flat crown. I always thought I had to be a little bit more careful with them
 
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