Firearm & Gun Forum - FireArmsTalk.com > Gunsmithing & Do-It-Yourself Projects > Gunsmithing Forum > Recent Win M-70's with chronic problems

Reply
 
LinkBack Thread Tools Display Modes
Old 08-20-2011, 04:15 AM   #1
Feedback Score: 0 reviews
 
Join Date: Aug 2011
Location: Waco,Texas
Posts: 6
Default Recent Win M-70's with chronic problems

New to this site, looking for advise and input from professional colegues.
I'm a second generation gunsmith and graduate from Trinidad State. Have seen over the past few years of Win M70's in the WSM calibers with factory defects stemming from the production year of when Winchester stopped production. It appears that many of the last units were shoved out the door as "Parts Guns". I have one in particular that is a thorn in my side.

Anybody here have any firsthand experience????



__________________
WillDgunny is offline  
 
Reply With Quote

Join FirearmsTalk.com Today - It's Free!

Are you a firearms enthusiast? Then we hope you will join the community. You will gain access to post, create threads, private message, upload images, join groups and more.

Firearms Talk is owned and operated by fellow firearms enthusiasts. We strive to offer a non-commercial community to learn and share information.

Join FirearmsTalk.com Today! - Click Here


Old 08-20-2011, 05:44 PM   #2
Feedback Score: 0 reviews
 
Join Date: Jun 2009
Posts: 48
Default Win 70

What's the problem?



__________________
johnsgunsmithing@live.com

Southern California
Anything legal , rifles , handguns , shotguns , black powder
john323 is offline  
 
Reply With Quote
Old 08-21-2011, 03:24 PM   #3
Feedback Score: 0 reviews
 
stalkingbear's Avatar
 
Join Date: Sep 2007
Location: Lebanon,Ky
Posts: 3,621
Liked 11 Times on 10 Posts
Likes Given: 3

Default

I'd heard about that happening but didn't have any come to me personally before I retired.

__________________

Sometimes you earthlings REALLY amaze me!

stalkingbear is offline  
 
Reply With Quote
Old 08-21-2011, 08:53 PM   #4
Feedback Score: 0 reviews
 
Join Date: Aug 2011
Location: Waco,Texas
Posts: 6
Default

So far I have had three come through my shop. The first would not shoot anything less than a 3" moa reguardless of ammo, due to excessive tooling marks full length of the bore.

The second had the mount screw holes so far off it was near impossible to mount anything up close to center.

But the one that is still with me is a 300WSM that locks up after firing. Checking the chamber with my bore scope, I could clearly see that the chamber was clearly rough with reamer chatter marks. after checking the headspace, which is tight, I polished out the chamber and neck. I then rechecked the headspace which is now well within specs, but she stills locks up. Checking the fired brass reveal nothing and is within specs.
Any Ideas??

__________________
WillDgunny is offline  
 
Reply With Quote
Old 08-21-2011, 10:50 PM   #5
Feedback Score: 0 reviews
 
stalkingbear's Avatar
 
Join Date: Sep 2007
Location: Lebanon,Ky
Posts: 3,621
Liked 11 Times on 10 Posts
Likes Given: 3

Default

Do you have a finishing reamer for it? I'd try running it VERY carefully in just enough to clean up the chamber. Lacking that, polish the chamber. Make SURE you don't create excessive headspace.

__________________

Sometimes you earthlings REALLY amaze me!

stalkingbear is offline  
 
Reply With Quote
Old 08-22-2011, 12:50 AM   #6
Feedback Score: 0 reviews
 
Join Date: Aug 2011
Location: Waco,Texas
Posts: 6
Default

Yeah, may have to do just that, even if I have to step it back a thread.

I'll jump back on it tommorrow and see what can be done.

__________________
WillDgunny is offline  
 
Reply With Quote
Old 08-22-2011, 05:30 PM   #7
Feedback Score: 0 reviews
 
Join Date: Jun 2009
Posts: 48
Default

Sorry I misunderstood your post. I haven't had any show up in my shop.

__________________
johnsgunsmithing@live.com

Southern California
Anything legal , rifles , handguns , shotguns , black powder
john323 is offline  
 
Reply With Quote
Old 01-20-2012, 02:30 AM   #8
Feedback Score: 0 reviews
 
Join Date: Aug 2011
Location: Waco,Texas
Posts: 6
Default

Well, as it is, this rifle still has me baffled. First round fires and extracts fine with out a hitch and the second round, you can't open the bolt even if you were to stand on it.

Nobody else has ever had anything simular to occur to them?

__________________
WillDgunny is offline  
 
Reply With Quote
Old 01-21-2012, 02:18 AM   #9
Feedback Score: 0 reviews
 
Join Date: Oct 2011
Posts: 15
Liked 3 Times on 3 Posts

Default

I've never actually taken an M70 apart, but I just pored over some diagrams. Not to state the obvious (I'm just a novice so I don't know what's obvious to a trained professional or if I'm just being stupid) but it has to be the recoil knocking part of the bolt around. If the headspace wasn't the issue, consider what components may be coming out of place and sticking where they shouldn't be.

__________________
Duke5728 is offline  
 
Reply With Quote
Old 01-21-2012, 07:04 AM   #10
Feedback Score: 0 reviews
 
Join Date: Sep 2011
Location: fordland,missouri
Posts: 11,099
Liked 862 Times on 648 Posts
Likes Given: 1

Default

Your locking lugs inside the reciever might be off a little bit. Me and my mentor had one in 270 wsm doing something similar. It turned out to be a burr on both the reciever and bolt. Same lug slot.

God didnt make all men equal colonel Sam Colt did



__________________
Marlinman is offline  
 
Reply With Quote
Reply

Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Firearms Forum Replies Last Post
Recent Gun Purchases mcfroggin General Handgun Discussion 13 05-22-2011 01:43 AM
Recent score pmanton Curio & Relic Discussion 9 01-19-2011 12:01 AM
Looking @ a 1965 to 70's 870 Wingmaster... flav General Shotgun Discussion 3 04-25-2010 07:20 AM