edwardware
Member
- Joined
- Feb 23, 2010
- Messages
- 4,424
As Fogerty said, "It ain't me!"
My first sidearm, purchased used at Riley's in Hooksett, with my dad, at 21 years old, is a Ruger Mk II Gov't Target. I haven't shot it much since I became serious about shooting (15+ years) but pulled it out a few months ago as I'm thinking on teaching my daughters to shoot.
. . . and it's unbelievably inaccurate! A group at 4 yards (yes, 12 feet) is 2" across (bench/slow fire). I can tear off a single raggedy hole with any other pistol I own (including other Mk IIs) and none of the ammo I've tried makes any improvement.
Off to borescope. . . yikes:
It appears that a monkey with a chainsaw file dug out the leade almost a caliber deeper up the bore at 6o'clock. From the breech there's visible asymmetry to the chamber/leade step. I can't see a chamber reamer doing that, so I have to assume it's damage from a cleaning rod, but it must have taken thousands of strokes. The rest of the rifling looks good, and the muzzle is properly dressed.
- Am I correct in thinking I've found the problem?
- Would it be possible to bore and line it, and stop short of (or recreate) the weird feedramp?
- Does anyone (now that Clark gave up) make new screw-in barrels?
- Could I improve the situation by throating deeper so the leade was symmetric (but way too far forward?
ETA: I apologize, I presumed that a thorough de-leading and re-seasoning of the barrel was SOP for rimfire accuracy issues. That is the first thing I did; no change.
My first sidearm, purchased used at Riley's in Hooksett, with my dad, at 21 years old, is a Ruger Mk II Gov't Target. I haven't shot it much since I became serious about shooting (15+ years) but pulled it out a few months ago as I'm thinking on teaching my daughters to shoot.
. . . and it's unbelievably inaccurate! A group at 4 yards (yes, 12 feet) is 2" across (bench/slow fire). I can tear off a single raggedy hole with any other pistol I own (including other Mk IIs) and none of the ammo I've tried makes any improvement.
Off to borescope. . . yikes:
It appears that a monkey with a chainsaw file dug out the leade almost a caliber deeper up the bore at 6o'clock. From the breech there's visible asymmetry to the chamber/leade step. I can't see a chamber reamer doing that, so I have to assume it's damage from a cleaning rod, but it must have taken thousands of strokes. The rest of the rifling looks good, and the muzzle is properly dressed.
- Am I correct in thinking I've found the problem?
- Would it be possible to bore and line it, and stop short of (or recreate) the weird feedramp?
- Does anyone (now that Clark gave up) make new screw-in barrels?
- Could I improve the situation by throating deeper so the leade was symmetric (but way too far forward?
ETA: I apologize, I presumed that a thorough de-leading and re-seasoning of the barrel was SOP for rimfire accuracy issues. That is the first thing I did; no change.
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