Lost accuracy in a 17HMR?

Discussion in 'Rimfire and Airguns' started by MSU Marksman, Dec 5, 2007.

  1. MSU Marksman

    MSU Marksman Well-Known Member

    Jul 15, 2007
    I was one of the lucky ones who got one of the first Marlin 17V's when they first came out. It's been a few years and a couple of thousands of rounds later, but the accuracy has really been dropping off lately. It started off being a .75 MOA gun at 100 yards, but now it's closer to 3-4 MOA. Now I'm trying to figure out what to do to get the groups back down. The muzzle looks decent, but I might have it re-crowned to see if it helps. If that doesn't help I'm out of ideas. Do I sell it and put the funds towards a newer 17? Should I try contacting Marlin to see if they would re-barrel it? What would you do with a gun that looses it's accuracy? TIA.
  2. CatShooter

    CatShooter Well-Known Member

    May 8, 2001
    Have you throughly cleaned it... I mean REALLY cleaned it.

    Many 17 HMR shooters treat them like 22 rimfires, and the cleaning is almost non-existant.

    But these little puppies do copper foul, and it doesn't come out with a lick and a promise.

    Use wet patches with copper solvent - don't use brushes.

    Keep wet patching, with 30 minutes between them to soak, until the patches come out white.

    I doubt that Marlin will re-barrel it, the cost would be as much as a new rifle.

    Also... do the regular checks - make sure the scope is tight, stock screws are tight, etc...


  3. HeskethPritchard

    HeskethPritchard Well-Known Member

    Nov 12, 2006
    +1 on Catshooter

    Clean Clean and Clean again.
  4. Ahab

    Ahab Well-Known Member

    Sep 25, 2005
    My 17VSS needs a liberal dose of Sweets 7.62 every now and then to bring it back to snuff.
  5. Nomosendero

    Nomosendero Well-Known Member

    Jan 17, 2005
    I have discovered the same thing as Catshooter is saying.
  6. Aussie Powder Burner

    Aussie Powder Burner Well-Known Member

    Jan 6, 2004
    17HMR Cleaning

    I hired a 17HMR in NZ for rabbit shooting earlier this year.
    When we received it the barrel looked like a smooth bore.
    It took several hours to remove the fouling and see rifleing again.
    About every 100- 200 rounds it required thorough cleaning and accuracy returned. We poked 1100 rounds down at rabbits and were very surprised at the overall performance of this little round acuracywise and quite lethal.
  7. bowhunthard

    bowhunthard Well-Known Member

    Sep 5, 2008
    Gunslick foaming bore cleaner, the answer to all copper fouling and cleaning problems.
  8. Tom Brush

    Tom Brush Well-Known Member

    Sep 18, 2006
    Try Patch Out! I use the accelerator too. I just took my .17 Remington from the safe and decided to push a patch down the bore. I always clean my rifles before putting them into the safe. I also run an oiled patch down the bore periodically to protect from rust. I haven't shot this rifle for several years.

    I ran a patch with the accelerator followed by one with Patch Out. The amount of powder fouling and copper I removed was unbelieveable. I continued the routine letting the cleaner soak for several hours and sometimes overnight until I got an absolutely clean patch.

  9. Savageman69

    Savageman69 Well-Known Member

    Oct 1, 2009
    I agree cleaning thouroghly would be a good first step, if that doesnt work try using moly i prefer oil to powder because it doest reduce velocity and doesnt act as a heat sink. i really dont think you shot out your barrel cuz ive put about 5,000 rounds through my .22 wmr and i clean with copper solvent and lube after every trip to the range so about every 500 rds it gets a thorough cleaning, preventative maintenence is as important, or even more than on your car. i havnt seen any decrease in accuracy at all gun):D, take a page from the "what we learned in Vietnam" book, every gun needs cleaning
  10. J E Custom

    J E Custom Well-Known Member

    Jul 29, 2004
    I totally agree with everyone about the cleaning.

    The 17s velocity is at or below 2600 ft/sec and should last 15,000 to 20,000 rounds
    before any accuracy loss with proper cleaning.

    I would suspect fouling or stock problems. If the cleaning does not cure the problem I
    would recomend re bedding and floating.