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Author Topic: Too fast?  (Read 1531 times)

nukehayes

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Too fast?
« on: March 07, 2013, 04:08:18 pm »
I have loaded several thousand rounds of 9mm using 5.4gr Unique under a 115gr Rainer leadsafe plated bullet with CCI SPP and COAL of 1.120".  Never had a problem.  Well, I ran out of Unique and the Rainer bullets.  I had some Bullseye and just got 500 plated 115gr Extreme Bullets so I decided to load up some plinking ammo.  I don't have a chrony (I know, I should) but following my Lee manual the min and max load is 5.1gr of Bullseye, so that's what I loaded.  Stupidly, I made 300 of these without trying a starter batch first.  They were throwing patterns out of my Glock.  Has anyone else had this problem?  I'm pretty sure the reason is, the rounds are going way too fast.  I pulled and reloaded 10 of them with 4.8grs of Bullseye and same COAL.  I will try these out to see how they cycle and (hopefully) group.  Thoughts?
Ohio-Geoff the Combat Mechanic
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    Re: Too fast?
    « Reply #1 on: March 07, 2013, 04:14:04 pm »
    Plated bullets act like lead bullets. Lead bullets go much faster for a given charge. I ran into the same problem loading min charge for jacketed bullets under lead in 9mm. Back the charge off and see how they shoot. Also, look for pressure signs on your brass from the first load. I found flat primers on my too-fast lead loads.
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    nukehayes

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    Re: Too fast?
    « Reply #2 on: March 07, 2013, 04:19:55 pm »
    Forgot to mention, I did check the brass from the initial loading, no signs of high pressure.  Thanks
    Ohio-Geoff the Combat Mechanic
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    Re: Too fast?
    « Reply #3 on: March 10, 2013, 01:43:27 am »
    Keep the crimps pretty light too. If you go heavy enough to strip the plating, it leads to all kinds of trouble.
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    mnw42

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    Re: Too fast?
    « Reply #4 on: March 12, 2013, 11:52:17 am »
    Quote
    Keep the crimps pretty light too

    I crimped a batch of .38 super using Berry's plated a bit to tight and it stopped grouping.  I never had a problem with the bullets moving, but I use a very light crimp just as an added measure of security.
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