Bolt gun barrel question on Headspace - M14 Forum

M14 Forum


Bolt gun barrel question on Headspace

This is a discussion on Bolt gun barrel question on Headspace within the Gunsmithing forums, part of the M14 M1A Forum category; I am wanting to put a long range .308 together to eventually play with at a varmint bench rest game that shoots to 1000 yds. ...


Go Back   M14 Forum > M14 M1A Forum > Gunsmithing

10Thanks
  • 2 Post By russmerle
  • 2 Post By PFC THOMAS
  • 1 Post By MitchAlsup
  • 1 Post By 45-70bpcr
  • 2 Post By Bamban
  • 1 Post By 1811MC
  • 1 Post By nicholst55
Reply
 
LinkBack Moderator Tools Display Modes

Old February 20th, 2017, 07:50 AM   #1
Platoon Commander
 
45-70bpcr's Avatar
 
Join Date: Sep 2007
Location: N/W PA
Posts: 445
Bolt gun barrel question on Headspace

I am wanting to put a long range .308 together to eventually play with at a varmint bench rest game that shoots to 1000 yds. Going to be a while until my gunsmith can fit me in. In the meantime I have a low mileage factory take off Remington varmint weight barrel I would like to screw on to play with. The action is a new 700 sa .308 face that has not been trued in any way. What are the odds I can put this factory barrel from a different gun on and have it headspace o.k. without setting it back some and reaming it? Can you make up small amounts of HS error by varying the thickness of the recoil lug? What number should I be ordering my HS gauge for? I had no idea there were so many gauge sizes available.

Thanks for any help!

45-70bpcr is online now  
Remove Ads
Old February 20th, 2017, 08:18 AM   #2
Platoon Commander
 
Join Date: Jul 2015
Location: Hampton Roads Virginia
Posts: 552
Larry Pottefield breaks it down pretty well and makes it sound very possible. This link is installing a short chambered barrel. You basically install the barrel and torque it 1/8" past hand tight. Then reem the chamber to proper HS. If you have the parts I'd install the barrel and just check headspace. You might get luck. If it doesn't work then you're not out too much and you learned something.

For the HS gage im standard and like keeping it SAAMI but other guys here that reload will have some good advice for pushing longer chamber specs. When I ordered my 300wm barrel for a savage build they offered a custom HS but I declined.


Thanks from 45-70bpcr and m1sniper
russmerle is offline  
Old February 20th, 2017, 08:29 AM   #3
Platoon Sergeant
 
Join Date: May 2010
Location: Komifornia
Posts: 305
You should be fine on screwing a take off barrel on.
1. Remington head-spaces their rifles up to .005 from SAMI minium I been told by a couple smiths
2. Remington barrels shoot very well and if you have an early varmint wt its VERY nice. Restocked a non prefix Rem 700 with varmint making an in expensive M40. Parked with oil finish M4o repro stock and it runs an easy 600yds. Sports a 2.5x10 USO piece of glass.
3. Seeing your user name tells me you can hand load. Loading for BPCR is not an easy task. Especially if you are casting and weighing each charge and guarding the bullets by wt. You can always fire form the brass and just neck size for that rifle.
4. Barrel it up check head space see if its in specs 1.630-1.634
5. Once again Remington makes a nice factory barrel. I like nice barrels having owned Krieger,Lilja and Obermeyer5R. But I'm not so inclined to re-barrel as I once was. Seen too many Remington 700 SHOOT WELL with factory barrels.
RUN IT
Pfc 2cents worth

Thanks from 45-70bpcr and russmerle
PFC THOMAS is offline  
 
Old February 20th, 2017, 09:53 AM   #4
Automatic Rifleman
 
Join Date: Mar 2015
Location: Austin Texas
Posts: 146
What are the odds I can put this factory barrel from a different gun on and have it headspace o.k. without setting it back some and reaming it? Pretty fair. For your purposes, you might even consider the barrel shootable if if passes the Field-gauge.

Can you make up small amounts of HS error by varying the thickness of the recoil lug? Theoretically, but it might take a precision grinder in order for you to do so. You are not going to have luck with sandpaper and hand power.

What number should I be ordering my HS gauge for? Just keep it simple and use s 308 GO and No-GO gauge set, maybe add the field gauge..

Thanks from 45-70bpcr
MitchAlsup is offline  
Old February 20th, 2017, 10:57 AM   #5
Platoon Commander
 
45-70bpcr's Avatar
 
Join Date: Sep 2007
Location: N/W PA
Posts: 445
Really appreciate the help! I do have access to a surface grinder if the lug needed ground but I didn't know if that was even feasible. Made sense in my head but that has gotten me in trouble more than once. I do reload too.
Ill order the gauges and see what happens.
Thank you all.

Thanks from russmerle
45-70bpcr is online now  
Old February 20th, 2017, 12:29 PM   #6
Lifer
 
Bamban's Avatar
 
Join Date: Oct 2006
Location: Austin, TX
Posts: 4,864

Awards Showcase

45-70 BPCR,

Here's I did the barrel change on my brother's bench gun. the receiver is glued to the stock, since i chamber on the headstock there is no way test fito the new barrel to the receiver. I took repeated measurements of the tenon; pitch diameter, tenon length, and relative measurement of the headspace and the cone. To do all the measurements I had to machine a couple of jigs. See pictures.

In your case if you have access to a lathe, machine a bushing to fit over the tenon and stop at the barrel shoulder and long enough for your depth micrometer to engage the back of the gauge when insered in the chamber. I made mine with aluminum. Take relative measurement of the old barrel, take measurevent of the varmint barrel the difference is what you need to compensate for to get the headspace right with the new barrel. This is assuming using the original recoil lug.

You have access to surface grinder, and if you have access to a lathe just make a washer type recoil lug and grind it to the thickness needed to attain headspace. Bed the rifle with the washer recoil lug. Back when I was hunting a lot I put together a switch barrel SA 700 with 308, 243 and 22-250 barrels using ground flat round washer. It is not prettiestthing with the washer sticking out above the barrelaw, but it worked great. In your case it just an interim thing, it should serve you well.

Edit. Too lazy to redo about the bench gun. I remember I made one for a 700 when I helped re-barrel a 700 for a friend. The pictures tell the tale.
Attached Images
File Type: jpg 20170220_142118.jpg (1.23 MB, 11 views)
File Type: jpg 20170220_142127.jpg (1.23 MB, 11 views)
File Type: jpg 20170220_142235.jpg (1.17 MB, 13 views)
File Type: jpg 20170220_142442.jpg (1.15 MB, 10 views)

Thanks from 45-70bpcr and 4Quangs
Bamban is offline  
Old February 20th, 2017, 09:23 PM   #7
Snappin In
 
1811MC's Avatar
 
Join Date: Oct 2015
Location: Tehachapi, CA
Posts: 35
The odds are pretty good that take off barrel will headspace. Get a go and no-go gauge. Have done this a couple times without having to setback or rechamber.

Thanks from 45-70bpcr
1811MC is offline  
Old February 21st, 2017, 01:20 AM   #8
Old Salt
 
nicholst55's Avatar
 
Join Date: Nov 2004
Location: Daegu, Korea
Posts: 1,645
Quote:
Originally Posted by 1811MC View Post
The odds are pretty good that take off barrel will headspace. Get a go and no-go gauge. Have done this a couple times without having to setback or rechamber.
I've done it a couple of times as well, and never had a problem with headspace. The factory letering, on the other hand, probably won't be properly aligned, but that doesn't effect the accuracy.

Thanks from 45-70bpcr
nicholst55 is offline  
Old March 14th, 2017, 06:54 AM   #9
Platoon Commander
 
45-70bpcr's Avatar
 
Join Date: Sep 2007
Location: N/W PA
Posts: 445
Update and Thanks! My factory barrel screwed on and head spaced perfectly so thanks for the help. Interesting to me at least. While I was waiting for my Clymer go/no go's and a factory .187" recoil lug to come I took a full length resized .308 case that was spot on according to my Wilson case gauge and screwed the barrel on until the bolt would just close on it with little resistance. I measured the gap where the recoil lug would go and it came in at .187". I marked the barrel and action. When the real gauges and lug came everything matched up to what my resized shell showed. Not suggesting at all trusting setting head space to a sized case but in this case they matched up. Remember I have no idea what I am talking about, just wondering out loud.

45-70bpcr is online now  
Reply

  M14 Forum > M14 M1A Forum > Gunsmithing

Moderator Tools
Display Modes


Similar M14 Forum Discussions
Thread Thread Starter Forum Replies Last Post
I received a question about a Shively Pistol Barrel for NM .45's. Gus Fisher Gus Fisher 0 July 28th, 2013 01:24 AM
M14 closes on 1.634 NO GO gauge- can I reload 308? Burner The M14 18 January 21st, 2013 05:37 PM
New bolt MickeyD1120 Gus Fisher 5 November 15th, 2012 10:13 AM
No more private sales at gun shows Frosty Mug Gun Rights 6 April 25th, 2009 06:45 AM
FA reply to chicom barrel replacement. Josh The M14 2 March 29th, 2005 03:17 AM



Top Gun Sites Top Sites List