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Thread: Measurement varies?

  1. #1
    Boolit Master
    Join Date
    Oct 2005
    Location
    S.W.VA
    Posts
    668

    Measurement varies?

    While measuring from front of receiver ring to the bolt face and extractor on a 93 mauser, measuring twice(more like 10 times) to finish ream once the numbers changed a lot too the tune of almost 10 thousandths. I took the action out of my unairconditioned shop to my unairconditioned den. The measurements were taken over about 45min along with other measurements. Because of 50year old eyes and infrequent depth mic. use my readings were sloooow! I was also up close to an incandesent bulb desk light so I could read the mic. With the heat from my hands and the light could the 1 inch rod in the mike have expanded that much? I'm not reaming yet nor will I till I get several repeatable readings.
    Thanks Aaron

  2. #2
    Boolit Buddy
    Join Date
    Apr 2007
    Location
    south georgia us
    Posts
    360
    Aaron, make sure the bolt is completly stripped and the locking lug receses are real clean. make sure the action face is without burrs. depth mikes are hard to use. its very difficult to feel when the little shaft is making contact with the bolt face without jacking up the body of the tool. also stay away from the fireing pin hole, sometimes there are burrs there.-phil

  3. #3
    Boolit Master at Heaven's Range, 2009 Phil's Avatar
    Join Date
    Sep 2006
    Posts
    534
    I have NEVER seen one of those old actions that were true! And most new ones are about as bad. Going from one side to the other of the inner collar on a M09 Argie I had over .006" difference. The bolt was about as bad. One Ruger No.1 that was brought in for rebarreling was so bad that you could see daylight part way around the barrel/ receiver face. Everything has to be trued, without seeing the parts I'd say you probably are seeing .010" difference side to side. Chuck the bolt up in your lathe and put an indicator on it, I'll bet you aren't making any mistakes, I'll bet the thing really is off that much.

    Cheers,

    Phil

  4. #4
    Boolit Master
    Join Date
    Oct 2005
    Location
    S.W.VA
    Posts
    668
    Thanks,going slow here and may true up reciever face before going further. I'm trying my hand at a 7.62X39 convertion.

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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