Gunsmithing Burrs in chamber

[juliomorris]

I have a new 10 FCP I noticed the bolt was sticking but the loads were not hot. I examined the cases and noticed scatches in 3 places very small scratchs but it is enough to make the bolt difficult. The rifle shoots 3/8" groups with 168 Amax's so i really don't want to have to send the rifle back to Savage. I can't see them but if I insert a casing and twist it I can see the scatches. Is there a way to polish out these burrs without possibly damaging the chamber?

 

[Hateca]

Re: Burrs in chamber

A sticky bolt is a sign of hot loads so that doesn’t mean anything.

How do you know the burrs on from the chamber? Can you see the burrs in the chamber or are you just assuming it's the chamber because you can see it on the brass?

It could be the scratches on the brass are from the feed lips, the follower, the bolt passing over top of the next round, and so on.

Chamber a round and without firing it extract it and see if the scratches are there.

Before you go and try and polish a chamber without knowing exactly what is wrong, have someone else, such as a builder, look at it first.

 

[Lumpy Grits]

Re: Burrs in chamber

Wrap some green Scotch Bright around a .22 rifle brush and BUY HAND turn the combo in the chamber(you may want to use a short cleaning rod). You want a tight fit, BTW.
When done, blow it out with some comp. air.
Respectfully,
LG

 

[juliomorris]

Re: Burrs in chamber

I put my 243 case on my stoney point and inserted it into the chamber and gave it a couple of twists. It came out with 3 fine rings sctached in the case. In the same locations as the scratches on the fired cases. So i know i have burrs I'm just wondering about some options other than sending it back. Could i polish, or take it to a smith and have him run a reamer in just enough to clean up the burrs? The loads are a little hot but the sticky bolt is what got me to looking. I also tried some factory loads and they were also a little tight. I know i have burrs and they seem to contribute to the bolt being alittle stiff. Light loads it doesn't stick but I still have the same 3 scratches. I will try to get pics of a couple of cases.

 

[Hateca]

Re: Burrs in chamber

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: juliomorris</div><div class="ubbcode-body">I put my 243 case on my stoney point and inserted it into the chamber and gave it a couple of twists. It came out with 3 fine rings sctached in the case. In the same locations as the scratches on the fired cases. So i know i have burrs I'm just wondering about some options other than sending it back. Could i polish, or take it to a smith and have him run a reamer in just enough to clean up the burrs? The loads are a little hot but the sticky bolt is what got me to looking. I also tried some factory loads and they were also a little tight. I know i have burrs and they seem to contribute to the bolt being alittle stiff. Light loads it doesn't stick but I still have the same 3 scratches. I will try to get pics of a couple of cases. </div></div>

Ok then the next question is where are the scratches located on the brass?

On the body of the case then you could do a light polish to nock off the sharp edge. On the shoulder or neck have someone look at it. You don't really want to do any polishing on the shoulder or neck of the cartridge.

 

[juliomorris]

Re: Burrs in chamber

They are on the mid to lower part of the body. The neck and throat are what I'm worried about and why i asked on here. Should i pull the barrel and polish or find a gunsmith? I build 1911 so I've polished a few chambers but I'm weary on a rifle. Could i take a swab and polish/lapping compound and take care to keep it away from the throat/neck polish by hand?

 

[Hateca]

Re: Burrs in chamber

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: juliomorris</div><div class="ubbcode-body">They are on the mid to lower part of the body. The neck and throat are what I'm worried about and why i asked on here. Should i pull the barrel and polish or find a gunsmith? I build 1911 so I've polished a few chambers but I'm weary on a rifle. Could i take a swab and polish/lapping compound and take care to keep it away from the throat/neck polish by hand? </div></div>

Sure if you can and have the tools to pull it then go for it, just stay way from the shoulder and neck.

Polishing the bolt chamber isn't much different then the 1911.

I don't like polishing or putting any type of tool down the chamber unless the barrel is off, too many chances of Appling uneven pressure or whatever.

I would pull it if you can, but from what you describe it doesn’t sound like it's going to take much to get it right so if you’re careful you might be able to leave the barrel on, that's your call.

 

[juliomorris]

Re: Burrs in chamber

I think more than anything I'm to nervice about. I needed you guys to talk me into doing what I knew I needed to do. I will pull the barrel tomorrow and polish it. I think your right It is very small burrs. Thanks for your help i will let you know how it turns out. I had originally intended to put a Shillen on this rifle but after I foud out how it shot I decided not to. Again thanks

 

[wnroscoe]

Re: Burrs in chamber

It sounds un-nerving I know but, you'll be just fine. It's the fear that'll keep you from screwing it up

Chuck it up in a four jaw and spider and indicate it on the OD of the previous machine work. Use a wooden dowel with a slit in the end to hold the paper, 320, 400 or 600 grit will work but do keep the WD40 on it. You'll be able to tell when it's slick.

Good luck.

 

[border_reiver]

Re: Burrs in chamber

lubrication is your friend, however you polish..Make sure it's soppin, and stay away from that case shoulder..