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Thread: Trimming 50-70 cases

  1. #1
    Ted is offline
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    Trimming 50-70 cases

    Hi,
    I was looking for some info, I'm trying to trim 50-70 win cases down to 1.5". I have a rcbs case trimmer pro but they do not make a shell plate holder for the 50-70 (that I have found). I was thinking of using an end mill bit on a drill press to remove the extra case length. If anyone here has shortened 50-70 cases and doesn't mind sharing, what's the best way to do it?
    Thank you,
    Ted, 14 CVI

  2. #2
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    What you trimming them down for?
    One thought just to make a trim die, you could use a sizer die and cut the top off to a point you use a file to bring to square.
    I have used a chop say to cut brass then use the trim die to true up.
    Last edited by MR. GADGET; 04-15-2018 at 04:48 PM.
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  3. #3
    Kevin Tinny is offline
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    Hello:

    Went through this for Spencer cases and then had Rocky Mountain Cartridge do custom ones. Just GOOGLE them. If Sherry answers, ask her for their son, Kody. Lots noise in background so get written confirmation of everything. Never have had any issues, goofs, etc. First class, old fashioned work ethics outfit!

    You should call and speak with Kody, who does the case making, at RMC and get a quote on finished cases because theirs might end up cheaper and annealed.

    I have several different cartridge cases of theirs and in a tight chamber, are everlasting. Hard to improve on their work.

    Forster makes a collet for its trimmer, but it must mate with oversized trimming cutter and pilot of mouth diameter, so best to CALL them. They are also first rate.

    My guess is CUT to a bit over desired length any way that is easy and finish trim to length in Forster rig. The shortened case will have THICK walls and probably need inside reaming. Forster can custom make what is needed. THEN they will have to be annealed, which is another topic. Flame annealing can be tricky. Lead pot dipping works, but needs technique to be shared.

    Regards,

    Kevin Tinny
    Last edited by Kevin Tinny; 04-15-2018 at 07:41 PM.

  4. #4
    Ted is offline
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    Thanks for the ideas.
    I'm making cases for a Joslyn

  5. #5
    Charlie Hahn is offline
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    Because the tendency when cutting brass to grab, I would not recumbent the end mill in a drill press unless you have a sturdy machine with a bolted down fixture.

    The annealed rim of the case makes this worse as far as grabbing. Making a holder for a case trimmer should not be a big deal, a lathe with collet is the best option.

    CH

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    Google some of the stuff on making 300 blackout cases.
    Lot of info on making different brass cases like you want to do.
    I have been using a jig and chop saw from Harbour Freight tools about 29$ and 3"
    Works great on all brass.
    I chop them.and then use a trimmer that lee makes. It can use shell holders so you could get better length average.
    MR. GADGET
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  7. #7
    spadegrip is offline
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    I know someone in the New England region that can cut 50/70 brass to any length. I'm with the 34th Va. We will be at the Nationals and Glastonbury, or call 978-395-7980.

    Thanks

  8. #8
    Lou Lou Lou is online now
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    Ted
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