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Ruger 10/22, 10/17, 77/17

Discussion in 'Gunsmithing and Repairs' started by rhocutt, Jun 17, 2013.

  1. rhocutt

    rhocutt Member

    My brother offered me a barrel which is marked for .17 HMR. It has no other markings on it. He said it bolts up perfectly to his 10/22 receiver. Numerich gun parts has a drawing of the Ruger M77 varmint which looks to have the same barrel mounting as the Ruger 10/22. I would rather have a bolt action so I'm wondering if anyone knows for certain if Ruger uses the same barrel / receiver interface design for the 10/22 and 77/17 varmint.

    Thanks in advance
  2. rcmodel

    rcmodel Member in memoriam

    Ruger only made the 10/17 semi-auto and 10/22 Magnum a couple of years.
    About 10 years ago.

    Both .22 Magnum and .17 Hummer caliber guns had steel receivers with integral scope mounts, heavier bolts, longer trigger guards, and longer magazines, and yet still?

    Both still had problems handling the pressure and recoil impulse.

    The barrel in question is most likely for a bolt-action, or a discontinued 10/17 steel receiver magnum action, and not for a common .22 RF 10/22.

  3. natman

    natman Well-Known Member

    Ruger made the 10/22 Magnum from 1998 to 2006. The 17 HMR version was talked about, but never put into production.


    The barrel is probably intended for the bolt action 77 rimfire. 10/22 Magnums are collector's items now, but even if you had one, trying to convert it to 17 HMR would be a bad idea. It would require extensive modification and the round has had lots of problems with exploding ammo when fired from a blowback semiauto.
  4. jmorris

    jmorris Well-Known Member

    IIRC the bolt gun barrels have cuts 180 degrees apart for two extractors, the semiautos only have one cut out for the single extractor.

    Converting a 77/22 from LR to magnum can be done though.
  5. rhocutt

    rhocutt Member

    Actually, my brother's 10/22 barrel has one extractor groove and the one that's available to me has 2 extractor grooves, 180 degrees apart. I'm starting to think an M77/17 build is forming up. Does anybody know where I could buy parts (I need everything but the barrel) for the M77/17?

    Also, more generally, how does the .17HMR head-space?
  6. Sun Tzu warrior

    Sun Tzu warrior Well-Known Member

    RC would be correct, attached is a Ruger manual, with parts lists. The 10/22 magnum carries a different part number for the bolt, than the 17HMR version. The early 10/22- 17HMR models had only one groove for an extractor, later versions had an additional extractor added in hopes of correcting cycling problems, and therefore two grooves in the barrel for the extractors. If you do have a Ruger 10/22 magnum, with two exrtactors you should remove the inboard extractor, as there is very little meat holding it in. If it breaks while firing your bolt will be ruined. (bolts are selling for $600+ on gunbroker)Hornady has since stated that the .17HMR should not be fired from any semi-auto because of OOB kabooms.

    Attached Files:

  7. natman

    natman Well-Known Member

    As I said:

    Making press releases and printing the manuals for a model you're planning on producing is one thing, actually putting it into production is another. There may have even been a few 10/17HMR prototypes, but they never put it into production, at least not that they acknowledge on the website.

    I'm willing to change my mind if presented with compelling evidence to the contrary.
  8. Sun Tzu warrior

    Sun Tzu warrior Well-Known Member

    Natman, you sir are correct, only pre production units were made, much like Kel-tec's RMR 30.
    http://www.gunknowledge.com/Firearms/Ruger/Ruger 1017/index.html
    There are many .17HMR barrels out there which will bolt up to a Ruger 10/22 magnum, and possibly a LR.
    Let's not forget the OP stated "the only markings are .17HMR"
    Though there many guys at rimfire central that claim their "builds" (adding a barrel) work without problems (so long as they are throughly cleaned after every 50 rounds), IMHO it is still a very bad idea.
    Last edited: Jun 30, 2013

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