Degree of Camfer on 90 Muzzle Crown

[hogpatrol]

As an experiment, I had a bud push a bronze brush through my dirty barrel while I held an open palm under and just forward of the muzzle. As the brush exited the muzzle and the bristles sprung back, a load of cleaner & debris was deposited in my hand. I figured if I pulled the brush all the way back to the the chamber, some of that stuff would be deposited there, in bolt lug recess, magazine area and trigger. Since then I have removed my brushes. As far as wear is concerned, I've never seen a worn out butter knife.

I guess my post disappeared. hogpatrol, if what you are saying is happening, you don't use a boreguide. That is what they are made for.

Butch, I do use one but it doesn't go all the way in to the bore. I would say there's always a gap for the junk to find its way in to the chamber & from there further back in the action.

 

[butchlambert]

You need to buy a quality boreguide then.

 

[butchlambert]

I recrown ever 400 rounds whether it needs it or not. Maybe that is saving me.

 

[WayneShaw]

Donovan, were the crowns you looked at sharp when done? Have you inspected a crown that was beveled when done.

Greg Walley at Kelbly's took some extremely high magnification photos of a crown, that showed the wear that nothing but the hot gasses caused. Very revealing.

I agree with Butch, a crown touch up is worth the time to keep a good barrel performing.

Ya'all keep doing what you feel good doing.

 

[58weasel]

Wayne:
Recessing is an alternative to cutting an inch off the end of the barrel after chambering etc.
Your barrel is a little longer, a little quieter, and the crown way more protected.
And if your barrel is buttoned-rifled and perhaps sensitive to machining too close to the bore, especially at the muzzle,
the recessed approach keeps the 5/8"x24 threading from closely surrounding the bore at the muzzle.
With some buttoned-rifle barrels probably wouldn't make a difference.
Something I just started doing on my last Krieger, and I decided that I like it, and think it's an advantage with the uncased usage that is common with my rifles.
Don't know if the directing of the hot gases from the blast in a more forward direction would be easier on the crown, compared to having the full "half sphere" available for the escaping gas. But what some of the fellas have mentioned makes me think the whole story of crown erosion is not perfectly understood. But some insightful suspicions exist apparently.
Those fellas touchin' up there crowns all the time may be on to something besides impeccable house keeping.
When I first found out about all that I couldn't believe it; but apparently there must be quite a few folks that follow that procedure.
So part of this is to have a crown reamer on hand that I can use for a little touch-up work if need. But I usually very hesitant to mess with that sort of thing.
When I put a barrel on a rifle, it usually stays there for the duration.
My first was a Douglas in 1983 on a Ruger No. 1 (30-338) and it is still being used. Will shoot it some this summer, but my Krieger 6xc has taken over the old thumper. Not quite a wall hanger by a long shot.

Really appreciate everyone's input. I know it takes a lot of time. Thanks!