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

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.

rc

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

http://www.ruger.com/service/productHistory/RI-10-22M.html

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.

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.

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.

Sun Tzu warrior said:

....attached is a Ruger manual, with parts lists. The 10/22 magnum carries a different part number for the bolt, than the 17HMR version.

Click to expand...

As I said:

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

Click to expand...

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.

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.