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Thread: 284 Win to 7.5 SR

  1. #1
    Boolit Master
    Join Date
    Jan 2006
    Location
    So. Cal.
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    1,373

    284 Win to 7.5 SR

    Some where I read that it was easy to convert 284 WIN to 7.5 SR. Is this true? Using a SR shell holder I stuck a 284 case in my SR di. Took awhile but I did manage to find my stuck case remover tool. Will use the 384 shell holder to expand necks to SR diameter. Is there anything else I should be aware of? I do have proper sized Berdan primers but they are a real pain to remove with water in the case. Don' mind Berdan primers for hunting loads but want to use Boxer primers for target/plinking loads. Any and all advise is welcome.

  2. #2
    Boolit Master
    Join Date
    Mar 2005
    Posts
    3,531
    Use a .308 shell holder with .284 brass.
    EDG

  3. #3
    Boolit Master


    Kraschenbirn's Avatar
    Join Date
    Dec 2006
    Location
    East Central IL
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    2,468
    I've reformed a couple hundred rounds of .284 to 7.5 Swiss in one pass using RCBS 7.5x55 dies. Using new brass, I didn't even have to anneal the necks. However, as you found, you need to use a #2 shell holder (.308/.30-06, 243, etc, etc) rather than the #3 that comes with the dies. On the other hand, Grafs has Boxer-primed Privi 7.5x55 in stock at a LOWER price than Win .284. Also, while I've found that reformed .284 works just fine in a couple of K-31s, my G96/11 doesn't like it at all...extractor won't hold on the .284's .022" smaller rim.

    Bill
    Last edited by Kraschenbirn; 07-28-2018 at 09:21 AM.
    "I'm not often right but I've never been wrong."

    Jimmy Buffett
    "Scarlet Begonias"

  4. #4
    Boolit Master

    Join Date
    Sep 2012
    Location
    Las Vegas
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    288
    [QUOTE On the other hand, Grafs has Boxer-primed Privi 7.5x55 in stock at a LOWER price than Win .284.

    Bill[/QUOTE]

    this was my initial thought, but you covered it. Making cheaper brass from expensive stuff, plus the effort, to get an out of spec finished product. I was considering making 475 Wildey from 284, but the math said buy the Starline pistol brass at $.25 cheaper than the 284, plus the cut, trim , ream operations. I like this stuff, but not that much.... then again if you have a butt load of free brass, it might make more sense..

  5. #5
    Boolit Master
    Join Date
    Jan 2006
    Location
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    1,373
    Thank everyone for the help. Got the stuck case out of the di and expanded some more cases. I am working with 284 brass because I bought it several years ago and had done nothing with it until recently. I will load some small number of cases to make sure my 1911 likes it. If not then I will have to buy 7.5x55 brass.

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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