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Thread: pin gages, how to read them?

  1. #1
    Boolit Buddy

    rockydoc's Avatar
    Join Date
    Aug 2013
    Northwest Florida

    pin gages, how to read them?

    I have a set of pin gages which are labeled "minus .0002".
    When placed into the muzzle of a new Miroku/Winchester M92 .357 Magnum/.38 Spl:
    The .346 pin goes, the .347 does not go. I read this as.3462" bore.

    What do you say is my rifles bore diameter?
    NRA Lifetime member since 1956, NRA Endowment Member. Reloading since 1954. CBA Member Navy Vietnam Veteran USS Intrepid CVA 11

  2. #2
    Boolit Master

    DougGuy's Avatar
    Join Date
    Apr 2013
    just above Raleigh North Carolina
    People really -really- need the half thou pins as I find the thousandth increments far too coarse to be accurate for measuring firearms. If a .346" pin goes snugly with drag against the pin, and the pin is .0002" under, the measurement is close to the advertised diameter of the pin, .346" If the pin goes with very little drag and you can rattle it a bit, but the .347" will not go, your measurement is more like .3468" which is why the half thou pins are critical for these types of measurements.

    If you had a .3465" pin, and it fit in the bore, a little more snugly than the .346" pin, then the bore is closer to .3466"~.3468" than .346"

    Yes .3468" is the actual diameter of the Z minus .347" pin, but you won't fit it into a hole so close to actual diameter.
    Last edited by DougGuy; 08-07-2018 at 01:37 PM.
    Got a .22 .30 .32 .357 .38 .40 .41 .44 .45 .480 or .500 S&W cylinder that needs throat reaming? 9mm, 10mm/40S&W, 45 ACP pistol barrel that won't "plunk" your handloads? Shoot me a PM! Also on Facebook:

  3. #3

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check