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Thread: Gas checked mold for AR-9mm's?

  1. #1
    Boolit Mold
    Join Date
    Nov 2017
    Posts
    27

    Gas checked mold for AR-9mm's?

    A follow-up of this old thread,

    I now have 2 9mm AR's: A Sig MPX and a homebrewed CMMG. Both eat my powdercoated Lee 356-124's just fine:

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    But I am not satisfied. I'd like to find a gas checked 9mm just because (please do not try to talk me out of this). Let's call it peace of mind for a $2000 piston-operated firearm (again, resist the urge to tell me how powder coating vitiates the need for gas checks, as this is about want not need).

    Is anyone doing a gas checked 9mm design with some decent load data (i.e., approximates the dimension of a popular cast bullet design)? Ideally something that feeds well (e.g., truncated cone).

    Silly me, I bought this design from Accurate Molds just to discover it was made for 357 Sig (too long to load safely for 9mm), and now I have to use it for 38/357.

    I was thinking this:



    Or customizing this to include a check:



    I prefer the latter because 125 is more common in load data and it has a recessed front for good chambering.

  2. #2
    Boolit Buddy
    Join Date
    Apr 2021
    Posts
    128
    Sages plain base gas checks would work. I check the RCBS ,44 SWC with them and then powder coat and use in a 44 Mag rifle. No leading and good velocity. Took a deer this week with them.

  3. #3
    Boolit Buddy pacomdiver's Avatar
    Join Date
    Nov 2012
    Location
    eastern PA
    Posts
    375
    or get one of the pat marlins check over plainbase checkmakers and use the bullets and same load you use now

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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