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    • #26078
      Reg
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      Help, need info. Tim, perhaps you have run into this.
      Does a standard large ring 98 Mauser barrel have enough meat on it to cut down and fit to a 1891 Mauser.
      Basically I think all dimensions should work out but my question is in the over all length of the extension.
      It has to finish up at .830 ( aprox) length and still leave at least 1.100 or more dia for the barrel to seat up on.
      The 91 does not have a inner ring so all locking must come at the receiver front and needs a minimum of that 1.100
      and I am thinking a minimum of another .075 or so to give it strength.
      Cannot find standard form dimensions for a military LR 98 barrel and the small tub of old used barrels
      I had I sold years ago on eBay.

      Am wanting to replace a barrel on a 91 action but keep the 7.65 caliber. Cannot find a source for NOS barrels or
      any commercial barrel in the correct bore and groove dia. All I can find is a take off Large Ring Military 98 barrel in the
      7.65 original caliber that is supposest to be in unfired condition. Not trying to keep it original in dimensions or appearance,
      just make a shooter out of it.

      Or if I could get someone to take a few measurements on a large ring 98 military barrel , it should be easy to
      figure out.

      Thanks

    • #26080
      lar45
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      I used to have a rather large list of different action threads and such, I’ll see if I can find it.
      This is all I could find for now. Don’t know if this will help or not.

      Rifle action dimensions

      Action threads length Reciver OD? other
      Mauser lrg. Ring 1.1×12 1.41â€

      Mauser sm. Ring .98×12

      CZ 550 1.1×12.7

      BBK-02 1.1×12

      Rem 700 1 1/16â€x16 .885
      1.0625×16
      Win 70 1×16

      Ruger 77 1×16 1.41â€

      Sako

      Weatherby mk V 1.06×16 .7
      1 1/16×16
      Browning A-bolt

      Ruger no. 1 1×16â€

      Rem Rolling block
      No. 1 smokeless 1.055×12 square 1.43â€

      Win 1885 High wall

      Sharps 1874

      Savage 110 < 2001 1.05×20
      Short magnum>2001 1.125×20 G series, noticeable step after threads
      CRF 1 1/16×20
      1.0625×20
      Bolt Shotgun 1.1×20?

      MRC 1999 1×16 UNF 2B .75

      Enfield M-17 x10 square

      Enfield SMLE

      Mosin Nagant .97â€x16 or 1×16â€

      Steyr M-95 1.020×14 tpi V .693†shank

      Win 94 .809×20
      Win 94 BB .875×28?

      Rossi 92

      Marlin 336 .775×12 square .85â€

      Marlin 1895 45-70 same as 336, 450 may have been changed to a v thread.

    • #26084
      lar45
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      Here is an Excell sheet with dimensions also.
      http://www.lsstuff.com/misc/barrel-threads.xls

      91 Arg .985x12tpi .715″ long
      M98 1.1x12tpi .625″ long

      It looks like there should be enough room to turn off the old threads and cut the shank a little longer, then cut the new threads.

    • #26085
      Artful
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      From what I’ve read 91s have a different ring diameter and threading than ‘standard’ small ring receivers.
      Most aftermarket small ring barrels are cut for the 93-95 and can be used on a 91 by setting the shoulder back .060″.
      The threads on a 91 are also supposed to be 0.005 larger than a 93-95
      but barrel and action threads vary enough from barrel to barrel and action to action that it might work without ajustment.

    • #26086
      Artful
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      Mauser Actions

      1) Small Ring M-1893-1896
      1.30 in diameter are 8.50 in length, Straight side walled receiver with screw spacing of 7.620.
      Small ring have a threaded shank diameter of .980 in. With 12 threads per inch.
      These include M-93-96 by Spain, Sweden, Germany. Spanish M-93 bolts have flat bottom, DWM M-95 bolt faces are round. Swedish bolts M-38/94/96 will fit only Swedish. Receiver stripped weight 13.0 Oz.

      2) M1910, M1936 Mexicans by FN and Mexico,
      1.30 diameter. receiver ring,
      8.50 in length, with screw spacing of 7.620. Barrel Shank .980
      Small ring have a threaded shank diameter of .980 in. With 12 threads per inch
      The barrel is a 4-groove with a twist rate of 1:9
      Receiver is slightly different from other Small Ring. Mauser (Bolts will not interchange with any other type Mauser). Receiver stripped weight 15.2 oz.

      3) WWI German KAR98A,
      1.30 diameter. receiver ring, 8.750 in length, with screw spacing, of 7.835 ) (7 7/8″)(Long action, Small ring).
      Has a threaded shank diameter of 1.100 in. With 12 threads per inch.
      WWI German Carbine, Also Polish 98az Uses a standard M-98 Bolt.

      4) Intermediate Large Ring M-98 ,(Large ring, Short action)
      1.410 diameter. receiver ring, 8.50 in length, with screw spacing of 7.620
      Intermediate Large ring have a threaded shank diameter of 1.10 in. With 12 threads per inch.
      Mexicans by FN and Belgium, the M24, M47, M48 by FN and Yugoslavia. A large number of M48 Yugoslavian large-ring M98 Mauser have recently been dropped on the market. This M-98 short is considered an intermediate action, and WILL NOT fit a Standard 98 Mauser stocks and standard bolts will not interchange.. Receiver stripped weight 15.0 oz.

      5) Large Ring M-98
      1.410 diameter receiver ring, 8.750 in length, with screw spacing of 7.835. Barrel Shank of 1.100
      Large ring have a threaded shank diameter of 1.10 in. With 12 threads per inch.
      Including M-98’s from WWI and WW2, GEW-98,M-98k, CZ-24, VZ-24,Spanish M-43/44 . Chilean M1912, Steyr Brazilian M1908/34, Brno 98/22, 98/29, DWM / Argentine. M1909, M24/30 Venezuelan, FN M1935 Peruvian, FN Standard Model, Mauser Oberndorf. Receviver stripped weight 15.5 oz.

      6) M-33-40 Small Ring,
      1.30 diameter. receiver ring, 8.50 in length with screw spacing of 7.835.
      Small Ring Long action. Lighting cuts on sides of receiver. Have a threaded shank diameter of .98 in. With 12 threads per inch. Also Brno Vz-33, CZ-33/40. Recevier stripped weight 13.4 Oz

      6) Mauser Magnums Commercial factory 1.50 in diameter., 9.240 in length, have a hole spacing of 8.207. Barrel Shank 1.141 Brevex Magnum. Rare and Pricey.

      7) Turkish Mausers there were in many different sizes and configurations. Thereare Intermediate as well as Long
      actions.
      Most receivers are large ring but with, small diameter treads,

      M-1938 Large Ring
      Same as #5 above, except with a small barrel shank diameter of .98

      M-1903 Large Ring Intermediate
      Same as # 4 above but with Tall clip charger guide, and small barrel shank of .98

      M-1893 Small Ring
      Same as #1 above

      8) Argentine 1891

      9) Siamese Mauser
      1.410 diameter. receiver ring, 8.50 receiver length with screw spacing of 7.60
      Threaded shank diameter of .515″ long, .990″ in diameter, with 14 threads per inch

      10) Kurtz (true Short Action)
      1.30″ Diameter receveir ring, 8 1/4″ Action Length. Hole spacing of 6 .60.
      Very rare, made in Germay pre WW2.

      11) Interams Mini Mauser
      1.195 diameter receiver ring, 7.25 Receiver length, with screw spacing of 6.25″

    • #26089
      Goodsteel
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      The 98 has a thread of 1.1 (1.098 actual) with a pitch of 12TPI and a length of .630.
      The “shoulder” varies from model to model but usually the front edge is .750-.800 from the face of the barrel. Measure this.

      The 91 has a thread with a major diameter of 1.00 (.992 actual) with a pitch of 12 TPI and a length of .715.

      SO,
      If your new barrel will have less than .050 after you turn the threads for the 91 action ( .715 + .050 = .765), then face a little off the front of the action to leave extra meat on the barrel. Simple.

      Once you’re sure you’ve got enough to bump against, turn the new major diameter of your threads to .992.
      If there is a slight witness thread left from the 98, just be cool and run your new threads over the same tracks so that there’s no double corner on the new threads. 😉

      Screw the new barrel in and grab your Grey Poupon. LOL!

    • #26102
      Anonymous
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      I have converted two large ring barrels to small ring threads, one for an 1891, and one for a Turk. There is just barely enough meat to do it , but it will work.

    • #26104
      Reg
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      Thanks one and all. I knew it would be close but I didn’t know exactly how close. Even if it comes down to just a few thousands, thats all I need.
      I knew the thread diameter would be sufficient it was the extension length that had me concerned. The Mauser military barrel does not taper off into a graceful form but rather ends abruptly then steps down. That there was sufficient amount of material to turn the extension and still have enough length to form a shoulder to support a barrel on a action that does not have a inner ring– that was the question.
      Looks like we are good to go so now to get that barrel ordered.

      Again, thanks to all.

      reg

    • #26633
      Reg
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      As a FYI update.

      After no small amount of looking I was told that the 1909 Peruvian ( NOT the 1935 ) used the same extension as the 1891. Peru specified this so as to use up a ton of extra barrels they had when they ordered the 1891 contract. I was told they ordered 3 replacement barrels for each rifle and carbine. They must have planed on doing a lot of shooting at something !!
      Found one that the owner called excellent on eBay and for the princly sum of 40.00 plus shipping it was on it’s way.
      Arrived today. I would call the exterior excellent and the bore and chamber even better.
      Now it had been set up for the 1898 type of rear sight, soldered on but I am thinking with a minimum amount of work this would be an excellent replacement for the impossible to find 91 barrels. Thread fit, extension dia. and length all seem to be perfect or at the least, close enough.
      For my sporting purpose, this will require only minimum fitting and shaping. but not having an original 91 barrel to measure I am thinking it would even work out for a military replacement as well.

    • #26667
      Goodsteel
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      Reg;n5261 wrote: As a FYI update.

      After no small amount of looking I was told that the 1909 Peruvian ( NOT the 1935 ) used the same extension as the 1891. Peru specified this so as to use up a ton of extra barrels they had when they ordered the 1891 contract. I was told they ordered 3 replacement barrels for each rifle and carbine. They must have planed on doing a lot of shooting at something !!
      Found one that the owner called excellent on eBay and for the princly sum of 40.00 plus shipping it was on it’s way.
      Arrived today. I would call the exterior excellent and the bore and chamber even better.
      Now it had been set up for the 1898 type of rear sight, soldered on but I am thinking with a minimum amount of work this would be an excellent replacement for the impossible to find 91 barrels. Thread fit, extension dia. and length all seem to be perfect or at the least, close enough.
      For my sporting purpose, this will require only minimum fitting and shaping. but not having an original 91 barrel to measure I am thinking it would even work out for a military replacement as well.

      That’s some valuable information right there Reg. Duly noted!

    • #26677
      Reg
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      Back in the late 60’s deHass and a couple of others came out with a table of barrel shank dimensions that are referred to to this day. In the course of fitting several hundred barrels through the years I have noticed minor discrepancies, nothing serious, some might have been manufacturers changes as time went on.
      In the case of the 91 though I may have found several major differences. May have been manufacturers changes as I understand there were at least 7 contracts with Argentina, a couple with Peru and somewhere the Belgians fit in there as well. I still have a few of these actions on hand. Will go in and do some serious measuring the shank dimensions and might draw up the 1909 barrel I now have. Might make some interesting reference.

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