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Thread: AR9s and 147 Grain Ammo

  1. #11
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    If the MFG sez not to use 147s, perhaps you should listen to them.
    I understand component availability problems right now, but it would seem to me the main argument for 147s is running suppressed.
    Changing ammo would seem an easier fix.
    Moon
    ETA- Thinking about this, and PP's remarks-I have a S&W 940 (9mm J-frame) which has a noticeably unpleasant rap with my standard 115 reloads...and it is much milder with my 147 grain reloads.
    M
    Last edited by halfmoonclip; 10-18-20 at 09:51.

  2. #12
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    Quote Originally Posted by halfmoonclip View Post
    If the MFG sez not to use 147s, perhaps you should listen to them.
    M
    Half moon,
    Iím sure what they recommend is what works best in the design constraints of the pistol. But if I can make a change to a component and have it be reliable with my load of choice, thatís what I would want to do. If 147s are just too long for the design, so be it. If I can change a weight or spring and get it to work Iíll try that. After all, thatís whatís so fun about ARs. Theyíre like Legos for adults.

  3. #13
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    Yer gun and yer call...
    I just hate to try to push string uphill...
    Best,
    Moon

  4. #14
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    Quote Originally Posted by JB2000 View Post
    Half moon,
    Iím sure what they recommend is what works best in the design constraints of the pistol. But if I can make a change to a component and have it be reliable with my load of choice, thatís what I would want to do. If 147s are just too long for the design, so be it. If I can change a weight or spring and get it to work Iíll try that. After all, thatís whatís so fun about ARs. Theyíre like Legos for adults.
    Polishing the ramp and chamber worked on my 8.5" FM9 upper.

    Dennis.

  5. #15
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    I polished the feed cone as well but it still hangs on long hollow points. Have you tried HPs in yours?

  6. #16
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    Quote Originally Posted by JB2000 View Post
    I polished the feed cone as well but it still hangs on long hollow points. Have you tried HPs in yours?
    Yes. Ranger 147g. I polished the heck out of it and the feed ramp with rubberized abrasive bits. I am running Colt mags.

    I do agree that if they say use 124g then get some 124g HPs. I decided that's what my Scorpion and 5.56 pistols are for as I don't think FMs are exactly duty grade. Fun, but not my go-to SD gun.

    Good luck!

    Dennis.
    Last edited by Dennis; 10-24-20 at 02:28.

  7. #17
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    Dennis,

    Mine takes Glock magazines which may make a difference. I’ll try polishing the feed cone more and try a carbine spring to see if that helps. This is my first PCC so it’s a learning opportunity. It sounds like the CZ is worth looking into.

    Thanks to both you and Halfmoonclip for your advice.

  8. #18
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    With a bare barrel in one hand and a 115/124 FMJ in your other hand, starting at a 45 degree angle, "drive" it up the feed ramp and around the corner into the chamber.

    It will generally feel smooth without much resistance throughout the path.


    Then, try the same thing with 147 flat nose.

    You'll likely find a large resistance or a sticking point as the cartridge makes the final turn into the chamber.

    This is the condition that can be improved by rounding the junction of the feed cone and chamber.


    Only do the minimum amount to get good feeding. Excess material removal results in an unsupported chamber and the potential for bad things to happen.
    Black River Tactical
    BRT OPTIMUM HFCL Barrels - Hammer Forged Chrome Lined 11.5", 14.5"
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  9. #19
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    Thanks Clint. I will give that a try. Iím going to need some more tools first!

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