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Lapping bolt lugs??

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/06/2008 at 17:12
cheaptrick View Drop Down
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Anybody done this themselves?
 
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/06/2008 at 17:23
Roy Finn View Drop Down
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Yes
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/06/2008 at 17:28
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Back in the eighties ( and again in the ninties ) Jon Sundra did a couple of how-to articles on lapping the lugs and feed rails and cocking piece of your bolt action.  I had those magazines for years but, naturally, I don't have them any more.......Whatever  
 
Should be floating around in cyber space--- maybe?----Shooting Times or   Guns and Ammo, I think....  
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/06/2008 at 18:18
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You can lap lugs yourself using a couple different methods, but if you're not going to re-chamber/rebarrel you run the risk of altering headspace.
No real reason to do this unless you have only one lug touching, then the action probably needs to be re-cut anyway.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/06/2008 at 18:25
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Mike, my Remington has always had excessive drag on the bolt.
It seems to be getting stickier, but maybe I'm just imagining it.
 
I was hoping to clean it up a little by lapping them.  
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/06/2008 at 19:19
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you can buy a race way polishing tool from brownells, and that may help with the smoothness
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/06/2008 at 21:09
Mike McDonald View Drop Down
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I'd be tempted to try some lube on the lug faces first and see if that helps.  If it does, and you've got alot of rounds down range without lubing the lugs periodically, look at them under a magnifier to see if they're galled.  If so, the mating surfaces of the action may also be, and we're kinda back to getting the action re-cut if it's bad.  If not, just take some 1200 grit compound and apply to the lug faces, chamber a fired case, and do a few lift/close cycles of the bolt. 
 
You might also look at taking some 1200 grit valve lapping compund and working over the sear cocking cut in the bolt shroud, there's alot of drag there.  It's the first thing I do to my rifles.
 
Good luck!
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I would do as Mike suggested and just use a small amount of grease (oil won't stay put very long) such as TM Ultra Bolt Grease, Montana X-Treme Gun Grease, etc. on the bolt lugs and see if that solves your problem.  If you do use the lapping compound, be sure you thorougly remove all traces of it once you get mating surfaces polished up, or it will continue cutting long after you're through.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/06/2008 at 22:04
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In addition Mark, if you want to give the lug lapping a try make sure you remove the firing pin assembly before you start lapping. I would try what others suggested and see where that brings you. When you state the bolt has "drag" are you referring to resistance when opening/cocking the bolt or drag as the bolt travels down the lug raceways? Not to make your head swim, but if you are seeing what you feel to be too much resistance when opening the bolt, you can buy a replacement firing pin assembly from Gre-Tan, PTG, Callahan that has a shorter firing pin spring and makes the bolt opening much easier. Just a thought.
 
Roy
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/07/2008 at 01:06
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I have a problem with both of my m57 coopers. The bolt binds up when you close the bolt moderately fast by the handle. If you push the center of the bolt it glides forward. I am thinking it is in the matte finish used on the receiver and on the back of the bolt. I have greased it heavy and it helps but It just does not seem right to use this much grease. Any suggestions?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/07/2008 at 02:32
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Should have been more clear.
 
No "drag" in the race ways. Those are smooth.
 
I've lubed the bolt lugs since day one with Tetra grease.
Still seems to "bind" more than I like when I open or close it.
 
I think I'll take a Sharpie and blacken the back side of the lugs and see if that will show anything. 
 
Thanks for the help!!
Good idea for the aftermarket FP assembly, Roy. I'll do that too.  
 
 
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