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Thread: Cut rifled barrel

  1. #1
    Boolit Master murf205's Avatar
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    Cut rifled barrel

    Can someone tell me how a barrelmaker knows how deep the groove is that a single point cutter is making? I have have had excellent accuracy results with barrels made in this fashion and I am just curious as to how they measure the first and subsequent groove depth. I have a really poor shooting 280 Ruger 77 tang safety that I am pondering a re-barrel.
    IT AINT what ya shoot--its how ya shoot it. NONE of us are as smart as ALL of us!

  2. #2
    Boolit Master murf205's Avatar
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    Must be a hard question
    IT AINT what ya shoot--its how ya shoot it. NONE of us are as smart as ALL of us!

  3. #3
    Boolit Grand Master



    M-Tecs's Avatar
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    Quote Originally Posted by murf205 View Post
    Must be a hard question
    Not really. A simple google search will answer your question. Start with "controlling the depth on a single point cut rifling machine"

    https://projects.nfstc.org/firearms/...m04_t06_06.htm

    https://www.bing.com/search?q=list%2...5F62A897EFE91F

    Last edited by M-Tecs; 02-21-2021 at 02:08 AM.
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  4. #4
    Boolit Grand Master
    Mk42gunner's Avatar
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    Never having done it, this is primarily guesswork:

    1. Measure the height of the cutter to figure the depth of the groove.

    2. Count the passes of the cutter through the barrel, while using the same number of shims or adjustments to the cutter.

    3. If all else fails, slug the bore and compare depth of each groove.

    Robert

  5. #5
    Boolit Master

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    I slug the barrel several times when rifling. If things are working right the cutter will only be taking out about .0002" per pass. A six groove barrel may take 120 passes.

  6. #6
    Boolit Master murf205's Avatar
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    No wonder they are more expensive. Do they need to be stress relieved after rifling is finished?
    IT AINT what ya shoot--its how ya shoot it. NONE of us are as smart as ALL of us!

  7. #7
    Boolit Master murf205's Avatar
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    That interview with Mr. Krieger was very informative and answered a lot of questions. Thanks
    IT AINT what ya shoot--its how ya shoot it. NONE of us are as smart as ALL of us!

  8. #8
    Boolit Master

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    Quote Originally Posted by murf205 View Post
    No wonder they are more expensive. Do they need to be stress relieved after rifling is finished?
    If the metal is stress relieved before machine work is done there should be no need to stress relieve again. Button rifling induces stress so the barrel needs to be stress relieved after.

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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