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Thread: AR10/.308 AR Build knowledge thread.

  1. #261
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    Now that there's a few years to have built up knowledge on this, is it a good time to ask what options bigger (more powerful) than .308 based actually work in the standard large frame AR format? I've seen boutique stuff mentioned here and there but nothing seemed to really get traction. SAUM supposedly was made but not for very long and parts scarce--break an extractor and you're screwed. One-offs in WSM's listed out of stock forever or priced like a motorcycle. Is there anything yet that I can get and not be in a quagmire? 284 maybe?

  2. #262
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    I'd say with the current availability of parts, if you want a SAAMI or wildcat cartridge in a self-loader you should probably pick something that uses a .308 bolt face and magazine.

    That opens up to a bunch of calibers and cartridges (like your mentioned 284, and 6.5 x 284 with shorter-seated bullets), including short mags with rebated rims.

  3. #263
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    Will the 284 work with the standard 308 extractor? I gather that's the one weak link in the short magnum system in that their extractors are specific, rare, and expensive.

  4. #264
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    I don't know. You could buy Winchester 100s and 88s in 243, 308, and 284 -- my guess is yes.

  5. #265
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    Quote Originally Posted by yellowfin View Post
    Will the 284 work with the standard 308 extractor? I gather that's the one weak link in the short magnum system in that their extractors are specific, rare, and expensive.
    Handy reference for bolt face dimensions: https://www.loaddevelopment.com/bolt...tion-database/

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