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?
Recrown and barrel?
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adk hunter
Well-Known Member
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.
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
Member
Dave Manson recrown kit.
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
Well-Known Member
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.
www.brownells.com
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.
BROWNELLS 79 DEGREE MUZZLE CROWNING CUTTER | Brownells
Check out BROWNELLS 79 DEGREE MUZZLE CROWNING CUTTER | Brownells available Online at Brownells Today and many more Reamers & Cutters products are available in our Tools & Cleaning Department.
www.brownells.com
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.
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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
Well-Known Member
When in doubt, send to a professional (GS). You won't DOUBT or question your choice…later.
tomcat818
Well-Known Member
Not to muddy the waters but add some food for thought. I ran across a gunsmith\machinist online who went about answering the question which crown is best from a precision\accuracy point. He shot the rifle with the existing recessed crown as a baseline then milled it off re cut a target crown shot that and then a 11 degree crown. The three showed a nominal difference in accuracy so he that made him think what would it shoot like with no crown so milled off the 11 degree and shot it with no crown and observed nominal difference to the crowned ends. I also ran across this test of velocity loss for taking off 1" of barrel at a time that also turned into do rifle crowns affect accuracy. I would be looking for other causes like loose action screws, bedding, barrel touching all the usual suspects. Seems to me there is way to much variation to be a crown issue.
rifleshooter.com
Do rifle crowns matter? Does a crown affect accuracy? I find out with the help of my grinder…
Do rifle crowns matter? Does a crown affect accuracy? I think most of use would say yes. It seems intuitive that the crown, the last part of the rifle that touches the bullet before it leaves the…
rifleshooter.com
I agree, what crown form isn't important, but the requirement that it is straight and clean can't be overstated. It makes a huge difference in accuracy to have a crappy crown like the OP. There are rifles that have perfect crowns that shoot poorly but none that shoot great with bad crowns.
