Hornady Lock N Load Modified case threads

Discussion in 'Reloading' started by Alucard, Jun 19, 2008.

  1. Alucard

    Alucard Well-Known Member

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    Hey all,

    I have the Hornday Lock N Load Overall length measuring tool. I have some of the Modified cases that you can thread onto the gauge. The only problem is that they do not make a 6-284 modified case. So I would like to make my own out of a fire formed piece of brass. So the question is, what threads do these modified cases use???

    I know its a 7mm hole, so I would assume that they used a 9/32 (0.28125) drill bit. The threads themselves are an oddball size. I have no clue what they are. I have tried damn near every 8mm metric thread I could find and none fit. I would assume they are 7mm since the bit used is 7mm but couldn't find any 7mm bolts. But, I am not sure of the pitch and thread count.

    I guess if I am in a real pinch I could just send Hornday the brass and have them do it, but I am in Canada, and do not want to wait the month round trip it will take to get this done.

    Any help would be greatly appreciated!!
     
  2. ss7mm

    ss7mm Writers Guild

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    5/16" x 36
     

  3. Alucard

    Alucard Well-Known Member

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    Thanks ss7mm!

    So, just so I know what I am looking for, which drill bit should I use? Get a 9/32 bit, drill out the center and tap using a 5/16" x 36 thread? Sorry for the noob questions. :p
     
  4. ss7mm

    ss7mm Writers Guild

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    Charts call for 9/32" drill
     
  5. gamedog

    gamedog Well-Known Member

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    You can also send in a couple of fired cases and they'll build you one for like $7.00 or so.
     
  6. Winchester 69

    Winchester 69 Well-Known Member

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    Usually the tap will have etched on it what size drill bit is recommended. This question comes up frequently, and if you do a search or two you can find the source and specs for these tools.
     
  7. Alucard

    Alucard Well-Known Member

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    OK, thanks for the help guys! I am in the process of hunting down a 5/16" x 36 thread tap. Not an easy thing to find. Thanks again!
     
  8. milanuk

    milanuk Well-Known Member

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    Call Russ Haydon's Shooting Supply in Gig Harbor WA; they should have them in stock. Various machine tool places will also, but it's nice buying from stores that support shooters.

    Monte
     
  9. geargrinder

    geargrinder Well-Known Member

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