Recrown and barrel?

[coop2564]

I have a new win 70 long range MB in 6.8 western. It shoots okay but not great. Most loads it does a little bigger than 1" to 1.5" best load right now is 155gr LRX .8" avg 3 shots. I got a bore scope and when looking at crown it's very rough. It's ragged, uneven and looks to have chips and or burrs. Looking at my Browning x bolt it's very even and smooth, same on bergara even and smooth. Both of those guns have hundreds of rounds. I only have maybe 40 rds thru winchester. My question is the crown isn't making it shoot horrible but it might be making it worst than it could be. Is there a tool that could clean up the crown or would I be best to take to GS for checking?

 

[adk hunter]

Search Brownell's for a DYI solution or Midway.
I'd start with a hard cotton cone with some polishing compound and a high speed drill and go from there. You basically have nothing to lose since a trip to the GS is always the backup solution.
Watch on youtube the velocity tests for barrel length with hacksaw that shoot like crazy if you want some inspiration to try it.

 

[cwlongshot]

 

[fseaman.js]

Dave Manson recrown kit.

 

[HSmithTX]

You need to move that crown back a ways, looks like 40-50 thousandths to get it completely clean. And yes, for a fact that crown is costing you accuracy. It will shoot better when it's fixed. Don't get it better, get it right. I had one better than that to start that shot inches groups and the crown repair brought it down under an inch.

 

[Rflshootr]

Personally, and it's hard to tell how much by the pics, I'd take enough off to get past all that raggedness. Maybe an 1/8" or a 1/4" then put a nice crown on it. My thought is there are 2 ways you can go about it. Call a gunsmith and ask what the cost is to face and re-crown. Then consider the price of a cutter like this.

BROWNELLS 79 DEGREE MUZZLE CROWNING CUTTER | Brownells

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Then you can lightly lap the edge like CW showed. If you think that you'll ever need it or have use for it again, then that would probably be the best way. If you think this will be a 1 time deal, then it's probably better to have it done in a lathe. If you opt to do it yourself, use a good quality cutting oil, take your time and check your progress as you go.
I'd say a rough estimate to re-crown is going to be somewhere near the same as the cutter depending on who is doing the job.

 

[coop2564]

The barrel is threaded, would it have to be cut back past the current threads and rethreaded?

 

[HSmithTX]

If I had to guess you'd need to take 40 or 50 thousandths off the end. No need to rethread or anything.

 

[fseaman.js]

The barrel is threaded, would it have to be cut back past the current threads and rethreaded?

If your goal is to clean up the crown, no.

Saying it another way. If you just need to clean up the crown, Brass lapping ball, Manson Recrown kit, midway cutter. Even the brass screw idea.

 

[Rick Richard]

When in doubt, send to a professional (GS). You won't DOUBT or question your choice…later.