Calguns.net  

Home My iTrader Join the NRA Donate to CGSSA Sponsors CGN Google Search
CA Semiauto Ban(AW)ID Flowchart CA Handgun Ban ID Flowchart CA Shotgun Ban ID Flowchart
Go Back   Calguns.net > INTERESTS AND ACTIVITIES > Gunsmithing & How To
Register FAQ Members List Calendar Mark Forums Read

Gunsmithing & How To Pro, Amateur & WECSOG and Tutorials, Guides & OLL Build Instructions

Reply
 
Thread Tools Display Modes
  #1  
Old 01-31-2019, 8:01 PM
JagerDog's Avatar
JagerDog JagerDog is offline
Calguns Addict
 
Join Date: May 2011
Location: South SF Bay Area
Posts: 9,249
iTrader: 21 / 100%
Default Potential stupid ?

Can a pre '64 Mod 70 in .264 Win Mag with an eroded throat be opened to .338 Win mag or is that a fool's errand?

The math appears to work, but I've no idea of the process.

Advantage/disadvantage vs. rebarreling to .338?


Ballpark cost (either path) ?
__________________
You know it's cold outside when the socialists have their hands in their own pockets



#Blackolivesmatter

Last edited by JagerDog; 01-31-2019 at 8:06 PM..
Reply With Quote
  #2  
Old 01-31-2019, 8:28 PM
justMike justMike is offline
Member
 
Join Date: Sep 2009
Posts: 296
iTrader: 29 / 100%
Default

I don't see how the the math works out when you have two different bore diameters, unless you're talking a new barrel.
Reply With Quote
  #3  
Old 01-31-2019, 8:32 PM
ar15barrels's Avatar
ar15barrels ar15barrels is offline
I need a LIFE!!
 
Join Date: Jan 2006
Location: Van Nuys
Posts: 45,245
iTrader: 96 / 100%
Default

Quote:
Originally Posted by JagerDog View Post
Can a pre '64 Mod 70 in .264 Win Mag with an eroded throat be opened to .338 Win mag or is that a fool's errand?

The math appears to work, but I've no idea of the process.

Advantage/disadvantage vs. rebarreling to .338?

Ballpark cost (either path) ?
What you are asking about is called reboring.
Then after boring, the barrel gets rifled and then rechambered.
This is usually only done on guns where you want to retain the original barrel exterior and markings, but you want to go to a larger bore to eliminate the worn out smaller bore.

http://www.35caliber.com/8.html
http://www.cutrifle.com/reboring.html

6.5 up to 338 is 5 steps up.
You would be better to go to a 7mm mag or a 300 mag.
__________________
Randall Rausch

AR work: www.ar15barrels.com
Bolt actions: www.700barrels.com
Foreign Semi Autos: www.akbarrels.com
Glock, XD and M&P pistols, Benelli and Remington shotguns: barrel, sight, trigger and receiver work.
Most work performed while-you-wait, evening and weekend appointments available.
Founding member of the CAPRC

Last edited by ar15barrels; 01-31-2019 at 8:37 PM..
Reply With Quote
  #4  
Old 01-31-2019, 8:33 PM
JagerDog's Avatar
JagerDog JagerDog is offline
Calguns Addict
 
Join Date: May 2011
Location: South SF Bay Area
Posts: 9,249
iTrader: 21 / 100%
Default

Quote:
Originally Posted by justMike View Post
I don't see how the the math works out when you have two different bore diameters, unless you're talking a new barrel.
By math, I mean there's material (much is identical except bore diameter)
__________________
You know it's cold outside when the socialists have their hands in their own pockets



#Blackolivesmatter
Reply With Quote
  #5  
Old 01-31-2019, 8:36 PM
JagerDog's Avatar
JagerDog JagerDog is offline
Calguns Addict
 
Join Date: May 2011
Location: South SF Bay Area
Posts: 9,249
iTrader: 21 / 100%
Default

Quote:
Originally Posted by ar15barrels View Post
What you are asking about is called reboring.
Then after boring, the barrel gets rifled and then rechambered.
This is usually only done on guns where you want to retain the original barrel exterior and markings, but you want to go to a larger bore to eliminate the worn out smaller bore.

http://www.35caliber.com/8.html
http://www.cutrifle.com/reboring.html
Yes.

There's a certain sympathy to the original rifle, but not a deal breaker.

End results (accuracy) compromised? (seems not compared to original)

Metallurgy of early 60's inferior?

Idea of costs on either method? (I see $250 listed...that's seems too reasonable...must be more to it???)
__________________
You know it's cold outside when the socialists have their hands in their own pockets



#Blackolivesmatter

Last edited by JagerDog; 01-31-2019 at 9:10 PM..
Reply With Quote
  #6  
Old 02-02-2019, 1:04 PM
JagerDog's Avatar
JagerDog JagerDog is offline
Calguns Addict
 
Join Date: May 2011
Location: South SF Bay Area
Posts: 9,249
iTrader: 21 / 100%
Default

Quote:
Originally Posted by ar15barrels View Post

6.5 up to 338 is 5 steps up.
You would be better to go to a 7mm mag or a 300 mag.
I have another pre-64 (featherweight) in .264. I have a "classic" in .300. 7mm doesn't buy me anything really. The "concept" was to basically turn the "Westerner" into an "Alaskan", keeping with the family of Win Mags which came out of together (.264, .338, .458 "African" ). I seriously doubt I'll be using a .458 unless I win the Lotto.
__________________
You know it's cold outside when the socialists have their hands in their own pockets



#Blackolivesmatter

Last edited by JagerDog; 02-02-2019 at 1:09 PM..
Reply With Quote
  #7  
Old 02-03-2019, 8:36 AM
Spyder's Avatar
Spyder Spyder is offline
Honorary MLC
CGN Contributor
 
Join Date: Mar 2008
Location: In a shack, in the woods
Posts: 12,065
iTrader: 105 / 100%
Default

Quote:
Originally Posted by JagerDog View Post
I seriously doubt I'll be using a .458 unless I win the Lotto.

I've used my 458 WinMag for cottontail.
Reply With Quote
  #8  
Old 02-03-2019, 8:38 AM
edgerly779 edgerly779 is offline
CGN/CGSSA Contributor
CGN Contributor
 
Join Date: Aug 2009
Location: canoga park, ca
Posts: 11,735
iTrader: 88 / 100%
Default

Not much meat left on the barrel. Rebarrel or go with Randalls suggestion.
Reply With Quote
  #9  
Old 02-03-2019, 11:01 AM
JagerDog's Avatar
JagerDog JagerDog is offline
Calguns Addict
 
Join Date: May 2011
Location: South SF Bay Area
Posts: 9,249
iTrader: 21 / 100%
Default

Quote:
Originally Posted by edgerly779 View Post
Not much meat left on the barrel. Rebarrel or go with Randalls suggestion.
Was a factory Mod 70 .338 a larger O.D. than a .264?

Stock is already glass bedded for this barrel.

Would be seeking "hunting accuracy".
__________________
You know it's cold outside when the socialists have their hands in their own pockets



#Blackolivesmatter
Reply With Quote
  #10  
Old 02-03-2019, 11:03 AM
JagerDog's Avatar
JagerDog JagerDog is offline
Calguns Addict
 
Join Date: May 2011
Location: South SF Bay Area
Posts: 9,249
iTrader: 21 / 100%
Default

Quote:
Originally Posted by Spyder View Post
I've used my 458 WinMag for cottontail.
I've killed jacks with .264. That was impressive. Are there even "varmint" bullets in .458?
__________________
You know it's cold outside when the socialists have their hands in their own pockets



#Blackolivesmatter
Reply With Quote
  #11  
Old 02-04-2019, 7:15 PM
Sailormilan2 Sailormilan2 is offline
Senior Member
 
Join Date: Nov 2006
Location: Bakersfield, CA
Posts: 2,417
iTrader: 6 / 100%
Default

Quote:
Originally Posted by Spyder View Post
I've used my 458 WinMag for cottontail.
Well, you certainly don't have to worry about them charging when wounded.
Reply With Quote
  #12  
Old 02-19-2019, 6:56 PM
LynnJr LynnJr is offline
Calguns Addict
 
Join Date: Jan 2013
Posts: 6,333
iTrader: 7 / 100%
Default

JagerDog
Give Cliff Lebounty a call.
He has done a few for a friend of mine and they shoot just fine.
If you don't need a new chamber it isn't that expensive.
If you start off with a 22BR going to 6BR or 25BR,7BR or 30BR is a breeze.
__________________
Lynn Dragoman, Jr.
Southwest Regional Director
Unlimited Range Shooters Association (URSA)
www.unlimitedrange.org
Not a commercial business.
URSA - Competition starts at 2000 yards!
Reply With Quote
  #13  
Old 02-20-2019, 3:12 PM
Whiterabbit Whiterabbit is offline
Calguns Addict
 
Join Date: Oct 2010
Location: Bay Area
Posts: 7,057
iTrader: 16 / 100%
Default

Quote:
Originally Posted by JagerDog View Post
I've killed jacks with .264. That was impressive. Are there even "varmint" bullets in .458?
All of them.
Reply With Quote
  #14  
Old 02-20-2019, 5:45 PM
Fjold's Avatar
Fjold Fjold is offline
I need a LIFE!!
 
Join Date: Oct 2005
Location: Near Bakersfield
Posts: 20,879
iTrader: 27 / 100%
Default

Reboring is a pain. It's easier to just spin on a new barrel. Saying that, reboring is just drilling the existing hole larger and then re-rifling the bore. For a .338, as long as the barrel wall thickness at the muzzle is about .125" or so (diameter of .588") it will work.

I bought a 458 Win Mag that had a .660" diameter barrel at the muzzle, which is .102" wall thickness and it was way too light up front. It jumped straight up when I shot it and tried to give me a black eye. I re-barreled it with a .750" muzzle diameter barrel and it's a lot nicer now.

You can shoot varmints with the 458 Win Mag, use the 250 grain Barnes TSX designed for the SoCom and 45.70, crank them up at 3,000 fps or so and they will demolish ground squirrels, jack rabbits, small cars, etc.
__________________
Frank

One rifle, one planet, Holland's 375

http://img.photobucket.com/albums/v214/Fjold/member8325.png

Life Member NRA, CRPA and SAF
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



All times are GMT -8. The time now is 10:31 AM.




Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Proudly hosted by GeoVario the Premier 2A host.
Calguns.net, the 'Calguns' name and all associated variants and logos are ® Trademark and © Copyright 2002-2018, Calguns.net an Incorporated Company All Rights Reserved.
Calguns.net and The Calguns Foundation have no affiliation and are in no way related to each other.
All opinions, statements and remarks made by Calguns.net on this web site and elsewhere are solely attributable to Calguns.net.