Countersunk muzzle crowns

[maxpower]

After seeing some pics of some 300WSMs with some deeply recessed muzzle crowns (countersunk 3/4") I was wondering if there were any drawbacks/benifits of the deeply countersunk crowns. I think the barrels have something like a bloop tube over the muzzle about 3/4" I.D.

 

[Larryh128]

I can't really think of any obvious advantages, it would however change the sound of the report slightly. The only disadvantage would be that it makes crowning the barrel much more difficult. I recessed a 300WSM barrel 1 1/4" , added an expansion chamber & made an integral muzzle brake in the barrel because I didn't want additional length in adding a brake.
No problem crowning it BUT it takes a lot longer to set up etc. There are several with the theory that it helps the accuracy of a bullet that exits in a baffled area and that is pretty well supported by the difference in accuaracy that I've seen in barrels pre & post muzzle brakes. This certainly could have been the same theory without the brake blast.

 

[Preacher]

That is usually done to help with muzzle blast, and it does work...
No other reason for doing it...

 

[RDavies]

OK, yes I suppose they would help diffuse the blast.
I dont see many of them around, so I was wondering if there were any accuraccy drawbacks??

 

[K22]

My new Browning X bolt composite stalker has a significant recessed muzzle crown. The rifle shoots fine (with my reloads), well under 1 MOA which isn't too bad for a light weight sporter barrel factory gun.