Author Topic: Changing a Ruger 77/22 17hmr barrel to a 17 mach2 barrel (Read 1589 times)

jcb67 · « **on:** October 04, 2005, 06:43:41 AM »

Can a Ruger SS 77/17 hmr barrel be shorten and rechambered to 17 mach2 so that it will fit a 10/22 receiver? If so, what would it cost?
Thanks,
John B.

Keith L · « **Reply #1 on:** October 04, 2005, 01:33:30 PM »

Onr problem is the base gun for the 17HMR is the .22 Mag and the 17 Mach 2 is a long rifle. They will not fit. Further, the 10/22 will not operate properly with the Mach 2, and the only conversion I know of includes a heaver handle to match slide with the dynamics of the Mach 2.

Check with Eabco, as they are the only ones I now of that makes a proper conversion at this time.

gunnut69 · « **Reply #2 on:** October 05, 2005, 11:43:17 AM »

It is my understanding that the mass of the bolt/operating handle has to be increased to slow the opening of the bolt. Increased spring tension will not be enough and forward bolt velocity, a function of recoil spring tension, could lower the life expectancy of the barrel.. I would expect the bolt stop to also be a synthetic version. Brownells carries a conversion kit for this job.

Keith L · « **Reply #3 on:** October 05, 2005, 12:53:41 PM »

Gunnut, I don't know for sure, but I would bet barrels for the 10/22 and the 10/22 mag are enough different to prevent swapping. Have you worked with both? I have played with 10/22s plenty, but no mags.

gunnut69 · « **Reply #4 on:** October 05, 2005, 05:43:40 PM »

Actually he was asking if a 77/17 HMR barrel could be inter changed into a 17 HM2 and installed on a 10/22. Technically you are correct, the answer is no but it is possible. It would require machining and special parts and the case diameter would have to be reduced (chamber sleeve)for the HM2. It could be done but would not be a wise choice financially. An HM2 could fairly easily be converted to 17 HMR but the 10/22 would have even great trouble with that round. I stand by my suggestion of a conversion kit as the best answer.

Keith L · « **Reply #5 on:** October 05, 2005, 10:12:39 PM »

I agree. Thanks

jcb67 · « **Reply #6 on:** October 07, 2005, 05:21:36 AM »

I have 77/22 22lr barrels installed on my 10/22. This requires a spacer and shim. By cutting the barrel shank and reboring the chamber to 17hm2, I think the barrel will fit. Then I can buy the bolt conversion kit. What would cutting the barrel shank and rechambering to 17 hm2 cost?
Thanks,
John B.

RugerNo3 · « **Reply #7 on:** October 19, 2005, 03:44:02 PM »

Back a few months ago on another board I visit; there was an instance of an aluminum 10-22 action splitting in the recoil buffer area that was fitted with an Eabco conversion. There can be many reasons for this to happen other then the conversion. Maybe Ruger's engineers are smarter then others.

??

gunnut69 · « **Reply #8 on:** October 19, 2005, 07:26:29 PM »

Most local shops charge a minumum setup fee of 1 hour for machine time and $50-75/hour for machine time. Rechanbering will likely run in the $25-75 range. The problem is the 17HMR chamber is larger in diameter than the HM2 chamber will be.. That means cutting off enough shank to eliminate the existing chamber before cutting the new. I would still bet you'd be money ahead just buying a barrel..

jcb67 · « **Reply #9 on:** October 26, 2005, 03:58:02 AM »

I found a guy who will cut the barrel to 16 1/2" and turn the shank to fit my 77/22 receiver for $60. I appreciate your answers to my question.
Thanks,
John B.

gunnut69 · « **Reply #10 on:** October 26, 2005, 06:30:57 AM »

Please note the differences in the 17HMR and the 17HM2. The HMR is a necked down 22WMR case while the HM2 is a necked 22 LR case. The differences are in the diameter of the case before the shoulder. The HMR barrel will have to be shortened the length of the full diameter portion of the case(a bit past the begining of the shoulder). Then the barrel can be chambered for the HM2. These barrels also require a dovetail to retain the barrel to the receiver. This will have to be moved forward the same amount as is removed from the rear of the barrel. Also the 10/22 cannot survive the pressures generated by the HM2 in it's stock form. The mass(weight) of the bolt must be increased as well as the spring tension. Failing to do this will cause the rifle to self-destruct.. The conversion kit uses different and heavier material for the bolt and actuator handle. This added mass holds the bolt closed long enough and reduces bolt velocity when it does open for the rifle to survive. This conversion is not a simple rebarrel!!! Failure to handle this properly could be highly damaging to your anatomy!!!