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Thread: Measuring Three Groove Rifling in a Trapdoor Springfield

  1. 02-05-2024, 08:08 PM #1
    broken-mold
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    Measuring Three Groove Rifling in a Trapdoor Springfield

    I'm strongly considering purchasing a high quality v-anvil mic for measuring chamber casts and pound casts from the three groove rifling in my TDs. That tool looks like it would measure boolit diameters a little easier also. Does anyone know of an easier, better, (or cheaper) way to measure three groove rifling?

    Also, I understand it will measure the groove diameter but what can be used to measure the bore diameter? I have tools for checking bores in shallow holes that could measure the bore at the muzzle but not deeper than that or in the chamber area.
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  2. 02-05-2024, 08:48 PM #2
    M-Tecs
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    This addresses all your questions. https://www.texas-mac.com/Measuring_...ove_Bores.html

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  3. 02-06-2024, 01:14 AM #3
    broken-mold
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    Quote Originally Posted by M-Tecs View Post
    This addresses all your questions. https://www.texas-mac.com/Measuring_...ove_Bores.html
    That information is exactly what I needed but I didn't know how to find it or even that it existed.

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  4. 02-06-2024, 11:41 AM #4
    marlinman93
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    Pin gauge sets are usually used to measure bore diameter. Not groove diameter, as slugging the bore will give that.
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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