Home Forums Hunting & Shooting Rimfires TC R-55 17HM2 Sporter Out of Battery Help

I have a TC R-55 17HM2 Sporter that had 2 pretty significant out of battery misfires last time I shot. I’ve only put a few hundred rounds through it and never had anything like that before. Blew the magazine out and broke the spring. Both were with the same box of Hornady 17 HM2 ammo. Ammo problem or Rifle problem? Sources for a new mag spring? (Old stock mags are $150). Email S&W (own TC now) or Hornady? Having trouble uploading photos, but will off my computer. Cases are completely blown out.

I had a Kimber 1911 conversion unit that would do the same thing, but it never blew out the case, just made me afraid it would. The case would get a nice little bulge right in front of the rim.

I would make sure the firing pin is not stuck in the outward position first...

I’ve been playing with these 17 HMR and 17 Mach II auto loaders for years. I can tell you that it’s not the ammunition. Some ammo is prone to having case neck cracks, but I think it was more of an accuracy problem than a case rupture. The camber gets dirty and the round doesn’t fully chamber. The gun fires and the unsupported part of the round ruptures. The only cure is to run a bore snake through the rifle every 50 or so rounds. It just takes a second. I don’t think that’s anyone is making an auto in this caliber anymore because of the problem. I’ve gotten rid of all of mine except for a Volquartsen auto in 17 Mach II and a buddy has one in a 17 HMR. Both kept clean and work great.

I’ll keep that in mind for my .22 mag AR. Thx.

Appreciate the input. I literally just ran a boresnake down less at 20 rounds prior. Action was nice and clean.

Will do. Appreciate it.

Agreed, the Mach 2 requires a clean chamber every 30-50 rounds to be safe in blowback actions.
Savage makes the A17. Sometimes the bore snake is not enough, a proper chamber brush is needed.