barrel crown

[glbpmc]

I removed the muzzle brake and there is no crown on the end of the barrel. Is this ok??

 

[Gmochty]

No crown???
Sure doesn't sound good!!
I would say no.
If your go to leave the break off I would definitely have a crown of some sort put on the barrel. But that's just me.

My 2 cents

 

[tightneck]

What exactly do you mean by no crown? If the barrel had no crown, it wouldn't shoot with or without a brake. There are many different style's of crowns from recessed to angled to flat and so on.

 

[glbpmc]

The barrel end was trued with a lathe and left with a sharp/ no clean up corner from the bore. This was done by Infinity precision.And yes it does not shoot worth S---.

 

[sjk]

Crowning of some configuration or another has to be done. It's the last point of stability that a projectile has before it leaves the bbl. If you merely cut off a barrel you'll leave some sort of burr. This is not acceptable. Any gunsmith knows this. Have a competent do this for you and check if the MOA improves. If it does not, you'll have to look elsewhere. It could be a multitude of reasons why it doesn't group
LOL

 

[Preacher]

Richard Franklin cuts his crowns sharp with no break in the edge the same as I do with mine. If the cut is real slow and very very little at a time is taken off and you start from the inside and go out there is no problem with them shooting very accurately if set up the correct way.....

 

[tightneck]

The 2 keys are that the crown is indicated with the bore, and is cut burr free. Nothing else matters.

 

[rbertalotto]

My crowns are all cut at 90 degrees with zero chamfer at the edge.

A 90 degree crown is quite easy to get just about 100% with any lathe, where an 11 degree "target crown" has all kinds of variables to consider.

On hunting rifles, I still use 90 degrees, but I do set the crown back about a .10 inch for protection.

Most smith that install muzzle breaks will simply crown at 90 degrees because this works best with a brake.

 

[a6mmbrman]

I have used a flat 90 degree crown without a chamfered edge for years. If done correct they work great. Four rifles I have built have been featured on this sight for setting world records. They all had flat crowns.

 

[buzzard]

You can get a rounded head brass screw put the thread end in your drill and 800 or smaller grit lapping compound and lap as good as crown as can be had

 

[rbertalotto]

You can get a rounded head brass screw put the thread end in your drill and 800 or smaller grit lapping compound and lap as good as crown as can be had

This has been advocated for years. It's in all the old "at home" gunsmithing books. It can be used on a hunting rifle that might have received a very slight nick in the crown during rough handling, but it will not produce the gilt edge accuracy many on this board are searching for. If your lathe tools are sharp and properly ground, and your lathe is running true and at the correct speed, there will be no need to lap the edge of the crown.
I use a 400 power B&L stereo microscope, set up on a custom built platform that attaches to my lathe to inspect my crowns. When I've experimented with laping the crowns with the Brownell lapping tools, it screws up a perfectly good crown.
Thanks