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N frame sights

flapjackflapjack Member Posts: 58 ✭✭
edited November 2010 in Ask the Experts
I have a 25-2 S&W that shoots to point of aim for 5 or six moon clips, and then, out of the blue, begins to act as if it is zeroed for a 6 o'clock hold. Windage remains correct, Ammo is the same. I have the elevation screw all the way down-tight. It is where it ended up when I last zeroed it when it came back from S&W from being worked on-not the sights. Any ideas would be appreciated. Thanks
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Comments

  • andrewsw16andrewsw16 Member Posts: 10,728 ✭✭✭
    edited November -1
    It is possible that lead and powder fouling is reducing the cylinder flash gap with the barrel, resulting in higher pressures and velocities. Try cleaning the fouling from the front of the cylinder and the rear of the barrel when this happens and see if the POI returns to normal.
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  • rufe-snowrufe-snow Member Posts: 18,650 ✭✭✭
    edited November -1
    Try shooting from a rest to see if it will still walk after 30+ rounds. Other wise only thing I can come up with is either the bore starts fouling, or your getting tired and flinchy after half dozen clips. I use to have a 25 with the 6 1/2" barrel. It's a big hunk of iron weighing nearly 3 pounds loaded. Shooting it off hand for anything over 50 rounds got old real fast. Yon need to have muscles like Arnold to be consistent with it.
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  • givettegivette Member Posts: 10,886 ✭
    edited November -1
    If the second grouping is tight, then it's not shooters' fatigue (answer that one for yourself).

    Although there's nothing wrong with the 6o'clock holding, you should be accomplishing this from the get-go, not halfway through the session.

    Fix? A bore brush on the pistol cleaning rod, and a small bottle of 'Shooters Choice' will bring the POI back to 'true'. Keep it with you at position. You will find that you may only need to 'scrub' once during each outing.

    Or, fire US Ball M1911 military rounds. Best, Joe

    EDIT
    Just noticed you are using moon clips. Are you shooting lead reloads? Or FMJ right out of the box? If it's military FMJ, then the culprit is the shooter, as fouling should not factor-in. Best again, Joe
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  • flapjackflapjack Member Posts: 58 ✭✭
    edited November -1
    Thanks guys. I should have said that I was shooting from a rest. I knew I was, so I guess I thought you all knew it too! I am shooting "roll your owns," usually 230 gr hard ball, or .240 or .255 SWC's-but lead all the way, over a full dose of Unique, so there is plenty of basis to suspect fouling. It just makes sence. I will check the adjustment screw to see if there is any wear that would cause a problem. Thanks for the help! flapjack
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  • dcs shootersdcs shooters Member Posts: 10,870 ✭✭✭
    edited November -1
    You might back off the "FULL DOSE" of Unique some and see what you get [;)]
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  • andrewsw16andrewsw16 Member Posts: 10,728 ✭✭✭
    edited November -1
    When shooting lead bullets in my N frame M29-2, hot loads result in lead coating the front of the cylinder enough that after several rounds I can visibly see the flash gap getting smaller and eventually closing to the point that cylinder rotation is impeded. The bore also gets pretty leaded up. The combined effects result in higher pressures. The permanent solution is to save the "full dose" of powder for jacketed bullets. Back off on the powder for your lead bullets. A few extra feet per second aren't going to hurt the effectiveness of that cartridge and your gun will perform much better. Good luck. [:D]
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