Making 338 Rum brass

Discussion in 'Reloading' started by waddwadd, May 4, 2011.

  1. waddwadd

    waddwadd Active Member

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    Im in the process of building a 338 Rum. The problem I have is brass availablility. No one seems to have any in stock at this moment. Can a person form it from 300 Rum or 375 Rum brass. Is it feasable to push the shoulder back .01 without any problems. Has anybody tried this before? any help appreciated.
    Wade
     
  2. geargrinder

    geargrinder Well-Known Member

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    I haven't done it, but is should be as simple as a FL size and a trim.
     

  3. sp6x6

    sp6x6 Well-Known Member

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    Have you tried Midway or Sinclair, OR buy a box loaded until back order gets in?
     
  4. waddwadd

    waddwadd Active Member

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    midway is on backorder until july I havent checked sinclair but everybody else is on backorder. I was thinking of loaded rounds. Just hate spending the money but I do need breakin loads so they would work. kind of saving that as a las ditch effort.
    Wade
     
  5. Outlaw6.0

    Outlaw6.0 Well-Known Member

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    I feel your pain brother, I LOVE my RUM but trying to find brass made my ears smoke... Thank god I was able to rat hole a couple hundred. Nosler is going to offer the 338 RUM but as far as I know it hasn't been released yet & at $60 per 25!!! (according to Nosler's site).

    Hopefully it is better quality, I don't hate the Rem brass but dang, the primer pockets are soft.
     
  6. birdrl

    birdrl Member

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    Regarding loose primer pockets in the 300 RUM which probably also relates to the 338 RUM. It has been my experience that you will get about 1 to 2 percent loose pockets on Nosler or Remington brass. I haven't noticed a difference in any of them. The RUM's produce a lot of pressure.
     
  7. waddwadd

    waddwadd Active Member

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    I think Im going to bumm some 300 ultra brass give them a dose of lube and see if I can tear my press off the bench. I figure if I can form 20 pieces that will get me through untill there is some avaiable. Any advise on how much to trim off the necks for starters. I will be pushing the shoulder back about .09 I was thinking about .05 just to make it a little easier. I might not even trim them untill after.
    Wade
     
  8. geargrinder

    geargrinder Well-Known Member

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    I just did it with a piece of 7mmRUM. It worked fine with a nice dose of Imperial sizing wax. It looked just like 338RUM but with a long neck. Trim to 2.750" after sizing.
     
  9. bigngreen

    bigngreen Well-Known Member

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    My buddy just crunched down 20 300 RUM to 338 RUM and it worked just fine with Imperial wax, didn't dimple at all. I kinda wonder what would happen if a guy had a reamer set up to use the sized down 300 brass with no trimming. Might improve throat life?
     
    Last edited: May 5, 2011
  10. geargrinder

    geargrinder Well-Known Member

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    Probably get some high pressure. That would be a ton of neck tension with that much surface area .
     
  11. davewilson

    davewilson Well-Known Member

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    the best brass to use for your 338 rum is RWS. i use it with my edge and it is awesome! i think Norma also makes 404 jeffries which is what i use in RWS.
     
  12. dakor

    dakor Well-Known Member

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    I have done it without any problems. I just used sinclairs sizing wax and made sure to rub a little in the case mouth after I trimmed a little off the case and before necking it up in the Full Length 338 Rum Die. They worked well in the rifle I tried them in.
     
  13. waddwadd

    waddwadd Active Member

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    thanks for all the input I will be trying it soon. will post the results when done.
    Wade
     
  14. YZEATER

    YZEATER Well-Known Member

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    please do.