modified case?

Discussion in 'Reloading Forum (All Calibers)' started by strut64, Jun 19, 2019.

  1. strut64

    strut64

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    I need someone to refresh my memory. I have the 5/16"X36 tap already. But, have misplaced the correct drill. Can some one tell me the correct tap drill size for the 5/16" x36 tap? Thanks in advance.
     
  2. Texas10

    Texas10 Gold $$ Contributor

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    .282 to .289 or letter L
    http://www.harveytool.com/secure/Content/Documents/Tap_Drill_Chart.pdf

    I accomplished the same thing using what I had. I tap my fire formed case 6/32 and use a short cleaning rod to slide the case with bullet seated into the chamber. If it tends to stick upon withdrawal, the bullet is in the lands. Reduce the CBTO and repeat until no tendency to stick.

    It goes without saying the chamber and throat need to be clean for this test.
     
    Zero333 likes this.
  3. DaveTooley

    DaveTooley Silver $$ Contributor

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    A simple search comes up with 7.25MM or a 9/32 or "L" will work.
     
  4. butchlambert

    butchlambert Site $$ Sponsor

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    A 9/32 is very close.
     
  5. Raythemanroe

    Raythemanroe Bullet Whisperer Silver $$ Contributor

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    Take out your ejector and firing pin assembly and seat long on a dummy round.. keep bumping it back until you don't feel zero from extraction.. Best most repeatable method I have found.. The modified case, by the time you feel anything you are well jammed

    Ray
     
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