.45 Super conversion

Discussion in '1911 Gunsmithing' started by CDMCKY, Nov 14, 2018.



    Aug 13, 2013
    I've been wanting another stainless 1911 10mm to IWB
    for a few years; I have 3 already, but they're just too nice
    to carry. I've looked at all the nicer stainless, 10mm's on
    the market, but they're all over $1200, and I don't want
    to spend that kind of money for more power.

    So I said, "SCREW THIS" and converted my Kimber TLE/RL
    stainless .45 acp to .45 SUPER, which gives the same ballistics
    as the 10mm; using Underwood .45 Super, 185 gr XTP/JHP's
    I get 1300/700 power, which matches 10mm 185 gr rounds
    AND I only needed to add $28 worth of parts to my pistol.

    Parts -
    1. 22# recoil spring & extra power firing pin spring $7
    2. 25# mainspring $6
    3. Flat firing pin stop plate $15

    AND for added dependability I use higher power magazine
    springs, which increase function/reliability; especially using
    the 8 round followers in my magazines.

    ALSO, to fire "lesser" .45 acp rounds I just need to easily switch
    to a 18.5 recoil spring.

    This setup in my TLE/RL fires like "butter" and (by the way) you
    do NOT need a "fully supported/ramped barrel", like so many of
    those with no real knowledge tell you online. The .45 Super cases
    are plenty strong, and there is no "bulging" of the case. Now if
    you wanted to go even hotter than the factory rounds, it would be
    a good idea to go with a ramped barrel.

    Underwood makes the best "higher power" rounds, (in my opinion),
    in several calibers, and charge HALF of "others" ammo. The nickel
    cases, cannelure/swagged bullets and smokeless/low flash powders
    are great. I also happen to think the XTP bullet is the best all around
    available today, and they feed real smooth.

    I really like like the features on The Kimber TLE, and with a little throat
    and ramp polish they are as reliable as the best.

  2. SparkyAZ

    SparkyAZ It is a dry heat, right...

    Sep 11, 2012
    Interesting... I have been checking into converting either a SA XDM or a 1911 to 460 Rowland.
    Agree with your recommendation of Underwood Ammo. Their 10mm stuff is second to none...

  3. wrmiller

    wrmiller The Tinker

    Oct 29, 2016
    I've been seriously considering upgrading my 45 to 45 Super as well.

    And I'll check out Underwood Ammo for my 10mm ammo as well, thanks. :)

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