Worth working on? Sporterized m98 mauser w/ bad chamber. - THR

Go Back   THR > Ammunition, Gear, and Firearm Help > Gunsmithing and Repairs

Welcome to THR
You are currently viewing our site as a guest which gives you limited access to view most discussions, articles and access our other FREE features. By joining our free community you will have, access to post topics, communicate privately with other members (PM), respond to polls, and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please visit the help section.

Thread Tools
Old September 22, 2014, 03:10 PM   #1
Ed Ames
Join Date: August 21, 2006
Location: Tejas Norte
Posts: 2,988
Worth working on? Sporterized m98 mauser w/ bad chamber.

I'm in a bit of a safe clean out mood and would appreciate thoughts and opinions on this...

I was given a commercially sporterized m98 in 30-06. It has an ok Monte Carlo (not cut down military) stock. I think it was made from a Nazi rifle after WWII by Golden State Arms or similar (that was their business model from after WWII until the 1960s).

It has the absolute worst chamber ever. As in it can't be shot because the reamer they used was chipped enough to cut rings in the chamber. The brass case forms into those rings and lock when the gun is fired. It takes a blithwapper to open the bolt with a fired case in the chamber.

I also have an in-the-white/rough chambered 7mm Rem Mag barrel I got a long time ago for reasons I have since forgotten. I don't really have a use for a 7mm mag Mauser and I am only assuming the cartridges will feed etc.

My question: is there anything worthwhile that can be made from those bits for a justifiable price? They are basically taking up space on the off chance I will get laid off and be able to use some of that sweet (fantasy) severance money to take some of the short form gunsmithing classes/use it as project material. However, after 20 years of holding on to that dream it just doesn't look like it is going to happen.

So what would you do if that was in the back of your safe?
Don't hide arms, get sidearms!
Ed Ames is online now  
Old September 22, 2014, 04:03 PM   #2
Join Date: March 7, 2005
Location: Florida
Posts: 1,419
Mausers are 1.10" x 12 TPI with a shank length of anywhere from .620" to .700" depending on the particular variant. Remingtons are 1.062" x 16 TPI with a .855" shank. The shank would have to be removed, with the shoulder cut back to create a new shank for threading. Depending on the specific chamber dimensions of the original chambering and the desired final chamber, you might or might not be able to clean it up with a reamer. We used to fit .30-06 03 Springfield barrels to Mausers that way ending up with a .308. The barrel contour from the shoulder forward also plays a part. If the barrel tapers too quickly the new shoulder will be too far forward with respect to the taper for good appearance. All of that to say that, basically, you need to map the barrel to make an accurate assessment its usefulness.
BBBBill is offline  
Old September 22, 2014, 04:44 PM   #3
Ed Ames
Join Date: August 21, 2006
Location: Tejas Norte
Posts: 2,988
Oops, sloppy wording on my part. I should say...I have an unfinished/in the white large ring Mauser barrel that has been short chambered for 7mm rem mag. As far as I know it will thread in and can then be finish reamed for headspace but I don't have the tools to hold the receiver properly and remove the old barrel without twisting something that wasn't meant to twist.
Don't hide arms, get sidearms!
Ed Ames is online now  
Old September 22, 2014, 05:31 PM   #4
Willie Sutton
Join Date: April 28, 2013
Posts: 1,781
Why don't you consider running a reamer into it for one of the "improved" cases? Where's the damage located?


Willie Sutton is offline  
Old September 22, 2014, 05:45 PM   #5
Join Date: August 28, 2008
Posts: 2,043
I would suggest you determine how deep the gouges are in the chamber, two options, the 30 Gibbs and the 30/06 Ackley improved.

There is the 308 Norma Mag if the bore is good, feeding will become a problem without additional work.

F. Guffey
fguffey is offline  
Old September 22, 2014, 05:52 PM   #6
4v50 Gary
Join Date: December 20, 2002
Posts: 16,569
The barrel is salvageable and I'd have the chamber reamed for another .30 caliber.

If it must be 30-06, then a new shank will have to be cut. The length lost from the barrel length will correspond to the area of the chamber that can be salvaged by reaming deeper.

ETA: The barrel can be bored out, a new 30 caliber liner inserted and a new chamber reamed.
TFL Aluminium. Molon Labe!
4v50 Gary is offline  
Old September 22, 2014, 09:27 PM   #7
Join Date: July 12, 2012
Location: West Texas
Posts: 662
If you have access to a lathe or someone who owns one, remove the barrel and set it back one thread (1/12" or .0825") and rechamber. The 30-06 has enough taper to clean up pretty deep damage with one thread setback.
Kp321 is offline  
Old September 23, 2014, 10:55 AM   #8
Ed Ames
Join Date: August 21, 2006
Location: Tejas Norte
Posts: 2,988
Reaming the chamber makes a lot of sense. I hadn't thought of that because I'm generally wildcat-ignorant.

I think my first step is to get some cerrosafe, melt and pour, and hope I can get it out of the chamber. That way I'll know exactly what I am dealing with.

Any advice for getting cerrosafe out of a rough chamber other than wooden dowel and mallet at 30 minutes?
Don't hide arms, get sidearms!
Ed Ames is online now  
Old September 29, 2014, 01:17 AM   #9
Join Date: November 12, 2013
Location: Mesa Arizona
Posts: 960
If you rebarrel the rifle with the 7mm Mag barrel, you will have to have the Bolt Face modified to fit the Magnum case head.
You are going about things the correct way.
Cast the chamber and see where the damage is.
Have the barrel pulled, and then one thread cut off the shank to set the barrel back.
Then it can be Hand reamed to proper headspacing.
Even if you had the barrel vise and the action wrench, you still need access to a Lathe.
But you can have the barrel pulled and replaced with any low cost short chambered aftermarket barrel , but that will end up costing as much if not more then to have the barrel set back one turn and re headspaced.
IMO, it is worth messing with.
For what you have in the rifle, it is well worth investing some time and money to get it shooting again.
LAGS is offline  
Old September 29, 2014, 01:31 AM   #10
Join Date: November 12, 2013
Location: Mesa Arizona
Posts: 960
When I do a chamber cast,
I use a 1/4" aluminum rod about 3' long.
I use it to push a patch over the end of the rod the same as if you were using the rod as a cleaning Jag.
Push the rod and patch on the end all the way in untill it is just at the throat of the chamber just ahead of the freebore.
Then tape the rod to the muzzle so it doesnt fall out or move.
Leave the rod in the bore when you do your casting.
The Patch should be snug in the bore anyway, but tape it just to be sure.
Now when you cast your chamber you only have ONE thickness of patch that will effect the force when you try to drive out the cooled cerosafe.
many people stuff a Ball of cleaning patch in the end of the chamber, and it creates a cushion when you try to drive out a stuck casting.
That is called " Over Ragging "

The aluminum rod also transfers more energy when pounding out the slug with a Mallet, and is less likely to fracture like a wood dowel will.

Don't worry,
If the casting Refuses to come out, the cerosafe can be melted in the chamber with a heat gun or propane torch by warming the chamber and pouring it back out.
Been there , Done That

Last edited by LAGS; September 29, 2014 at 01:49 AM.
LAGS is offline  
Old October 2, 2014, 09:14 PM   #11
Maj Dad
Join Date: December 1, 2005
Location: Carolina Low Country
Posts: 1,451
New Barrel

For $80 and change you can have a new short chambered 98 barrel chambered in 30-06 or 4-5 other non-magnum caliber from Brownell's. If it's the challenge you're after, disregard...

Maj, USAF (ret)
Member, SCV
Life Member VFW, DAV, TSRA and MOAA
Benefactor Member, NRA
Maj Dad is offline  

Thread Tools

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 -4. The time now is 06:25 AM.

Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
vBulletin Optimisation by vB Optimise.
This site, its contents, Shooting Reviews, and its contents are Copyright (c) 2010-2013 Firearms Forum, Inc.
Although The High Road has attempted to provide accurate information on the forum, The High Road assumes no responsibility for the accuracy of the information. All information is provided "as is" with all faults without warranty of any kind, either express or implied. Neither The High Road nor any of its directors, members, managers, employees, agents, vendors, or suppliers will be liable for any direct, indirect, general, bodily injury, compensatory, special, punitive, consequential, or incidental damages including, without limitation, lost profits or revenues, costs of replacement goods, loss or damage to data arising out of the use or inability to use this forum or any services associated with this forum, or damages from the use of or reliance on the information present on this forum, even if you have been advised of the possibility of such damages.