bore lapping a rough bore

M

mbogo3

CGN Ultra frequent flyer
Rating - 100%
87   0   0
What is the procedure and what product woud one use for smoothing out a new rifle bore that has chatter marks /copper jacket buildup about 1/2 way down? It's a Win 70 Classic SS in .338 It groups nice to start with then starts throwing fliers.Now I know why.If it can't be cured I'll rebarrel.Harold
 
Winchester is really proud of their barrel making abilities, I would contact them and bring up the issue with them, you have nothing to loose and every thing to gain. As for lapping out the barrel, if it is very minor then a firelapping kit might help but otherwise you stand more of a chance of hurting the barrel than helping it.
BB
 
Everybody has a little trouble hammerforging stainless and I guess Winchester is no exception. Those chattery barrels used to be a Remington specialty but I guess no more.
Usually, to lap those kind of marks out means the removal of at least a half thou of material. Regards, Bill.
 
Well ,I got off the phone with Winchester and they won't be helping me out.No warranty repair in Canada and they don't have a licence to return the gun to Canada?Not impressed after owning many Winchester guns.......................they suggested bringing the gun down myself and driving it back?Harold...... great idea.............jail time!
 
Last edited:
mbogo3 said:
Well ,I got off the phone with Winchester and they won't be helping me out.No warranty repair in Canada and they don't have a licence to return the gun to Canada?Not impressed after owning many Winchester guns.......................they suggested bringing the gun down myself and driving it back?Harold...... great idea.............
Click to expand...

That is unreasonable, and quite disappointing.
 
220Swifty said:
I wonder if that also applies to Browning products, or do they still fix those in Montreal?
Click to expand...

Did they ever?

This is not an uncommon problem although, as I said before, it is a bit uncommon for Winchester. I wonder if the move to South Carolina affected their barrel making arm. There is always the possibilty that they lost their best people during the transition. Regards, Bill.
 
You'd think Winchester ,a multi-million dollar company could afford an export permit? Or at least employ a Canadian smith that looks after warranty work? What is the procedure for using JB bore paste? Need to find where to buy it locally as it likely can't be mailed.....Harold
 
I do not believe JB bore paste is abrasive enough to smooth a rough bore unless you have two or three days to spare, and muscles in your arms to match the time. Regards, Eagleye.
 
In speaking to Winchester tech support, I got that the equipment has been set up in an all -new facility but he wasn't clear on whether the machinery was new or not. He did admit that ALL personel were new. I suggested they might want to go back and re-hire whoever was previously in charge of barrel production because the new guy sucks! I was told he would pass it along. Yeah, right! Regards, Bill.
 
mbogo3 said:
You'd think Winchester ,a multi-million dollar company could afford an export permit? Or at least employ a Canadian smith that looks after warranty work? What is the procedure for using JB bore paste? Need to find where to buy it locally as it likely can't be mailed.....Harold
Click to expand...

JB Paste will smooth out minor problems, but as noted, it's not very aggressive and may not work for you if indeed the new barrel guy sucks!
 
I one showed the Neco kit to a well known barrel maker. he said it would do no harm, if I followed the directions.

JB would not be practical.

You could use the Neco and just do the first step and look at the results and try shooting. If it has improved, finish the process (polishing). If it has not worked, repeat step one.

Step one will move the throat edge forward a tad. Not a big deal, but just note that you may want to seat bullets a bit farther out.

I use unsized cast bullets and a minimum amount of pistol powder to launch them.
 
Personally I think I would take a good hard look at hand-lapping before fire-lapping. I really get the impression that the main reason people jump on that idea is that it looks so quick and easy which makes it easy to overlook the downsides.

Honestly never done either myself though so those who have might have better advice.
 
I did the NECO firelapping kit starting with 220 grit of 10 rounds swabbing with machine/cutting oil then JB bore paste for 20 stokes followed by another swab of cutting oil.This cleaning was done every 5 shots until done.Next was 400 grit ,then 800 grit and finally 1200 grit -20 rounds .This is supposed to remove and polish about .0002" The loads recommended by the manufacturer were 15gr of Unique/1459fps/2400psi and I used 250gr Hornady's seated to almost touch the rifling at 3.422 OAL Will let the smith have a peek with his borescope and go from there with either another 1/2 treatment or take it shooting...........Harold........time consuming no doubt
 
Last edited:
Someone gave you bad advice about warranty support in Canada ...

http://www.winchesterguns.com/customerservice/partsservice/authorized-repair-centers.asp

Bashaw Sports Centre
5012- 50th St Box 126
Bashaw AB, T0B0H0
ph 780-372-4440
fax 780-372-4447
Email

Genes Gunsmithing
Box 34 GRP 326 RR 3
Selkirk MB, R1A2A8
ph 204-757-4413
fax 204-757-4728

Complete Gunsmithing Services
71 O'Leary Ave
St. Johns NF, A1B2C9
ph 709-738-6310
fax 709-722-0622
Website

W R Longs LTD
4992 Rice Lake Drive North
Bewdley ON, K0L1E0
ph 905-797-2700
fax 905-797-2650
Email

L'Armurier Alain Bouchard Inc.
420 Route 143
Ulverton QC, J0B2BO
ph 819-826-6611
fax 819-826-6885

Magasin Latulippe
637 rue Saint-Vallier Quest
QUEBEC QC, G1N1C6
ph 418-529-0024
fax 418-529-6381
 
That would be the Winchester warranty centre in the USA...................wish I'd have taken note of his name
 
Last edited:
I got the same treatment from Remington's warranty division.
Seems plausible deniabilitty of Warenty to Canadian gun owners is an American gun manufacturer norm.
I measured how far down the marks appeared to be. In the bore with a wire and a bright light,then marked a cleaning rod with a magic marker to know where to work the rod.
Then I loaded a couple of cleaning patches with some metal polish and inspected the bore every few strokes until I was satisfied with the results. No more rough bore on my Rem 597.
This method effects the damaged area without affecting the entire bore.
 
The instruction book in the kit said to use non-embedding abrasive paste so it doesn't stay in the barrel.Valve grinding paste is what not to use. I'll see how it shoots and hopefully the copper fouling is history........the idea is to make the entire barrel uniform internally with no tight spots or rough areas..................Harold
 
You must log in or register to reply here.
Back
Top Bottom