Crown preference

[Rick in Oregon]

Was there any data on what the difference was between a recessed and 11 degree crown?

It's common to do a 11 degree muzzle crown and recess it with the 'ridge' of the recessed part protecting the crown, sometimes called a 'floorboard' crown for resting the muzzle on the truck floorboard/firewall and still retain the 11* crown.

There was much lab data using high speed cameras to show the sonic wave ahead of the bullet, along with the disturbed trail behind the bullet with and without the 11* crown. From the labratory photos in PS, it was apparant that the 11* crown created the very least disturbance to the heel of the bullet.

 

[jwv2001]

All About Rifle Muzzles and Crowns

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This might help?

Mike, Thanks for the article. I hope shooters understand what and where the crown is. I hope they understand whatever design that is on the end of the barrel is not the crown. 11 deg,, target, recessed, are all terms that confuse the issue. Hyperbole. If they still don't understand, they have to read that article again.

 

[jackieschmidt]

Years ago, Gene Bukys and I did a test on this very subject, using a Light Varmint Benchrest Rifle. We would fire some groups, take the barrel off and to my shop, We tried a simple flat crown, a recessed crown, and a 11 degree. The bullets were Bruno OO 68 grn boat tails.

We could not determine any difference in the accuracy potential of the rifle with any one of the three.

I prefer a countetbored recess crown because it looks good.

 

[V35]

I usually cut a flat recessed, sometimes I do the 11 degree, well close to that, I just use the marks on the compound. I trigged them in forever, then realized I would never see the difference. However, If someone requested an exact degree crown I would do it for them. On my personal rifles I always shoot supressed, so the whole gas movement theory is totally out the window at that point.

 

[JMayo]

I run Ezell tuners on my short range (11 °).
They cover up all but the center much like jackie's counter bore
A friend has a big barrel counter bored 1.5 -2" down the muzzle. Almost like a built on bloop tube on his hvy 6ppc. No adjustable tuner.
Interesting idea to me.

 

[jelenko]

We could not determine any difference in the accuracy potential of the rifle with any one of the three.

Thank you!
This was the point I was trying to get at when asking about data.