Looking for help reloading 9mm.

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Looking for help reloading 9mm.

Post by jlow on 1/6/2019, 8:36 pm

First topic message reminder :

First of all, new to the board and I am not a bullseye shooter but I am here because I know you guys can be a wealth of knowledge so I am hoping you can help me.

The gun I am reloading for is a SIG MPX PCC pistol.  This is a semi-auto with an 8” barrel. 

I have over 10 years of experience doing precision reloading but only for centerfire rifles, so a lot of the things we do like annealing, turning necks, etc. do not translate to pistol reloading.  In terms of pistol reloading, I have done many tens of thousands of rounds but they are plinking and not precision ammo.

Currently my load is what I use for my handgun - range pickup brass, Rem 1 ½ primers, 3.2 grain of Tightgroup, COAL 1.147", and 147grain Precision Delta FMJ.  This load shoots reasonable in my PCC i.e 3-4” groups at 50 yards.  What I am hoping is to shrink it down to a consistent 2” group.

Looking at an article from Accurateshooter.com on precision handloading, I realize that I need consistent brass – to that end, I have sorted my brass by headstamp.  Currently using FC since I have a lot of that.

I also see the importance of optimizing taper crimp – to that end, I am using a Hornady adjustable taper crimp die and have done optimizing studies looking at different degree of crimp.

I see the importance of uniform COAL – to that end, I have started to uniform my sized cases using a Lyman case trimmer.  This is where my main question is:

1)      Is trimming brass to consistent COAL a good idea for precision?

2)      If you trim, is chamfer/deburr (which is required for rifle brass trimming) a good idea?

3)      Is trimming slightly shorter than SAAMI a bad idea?

Of course any additional suggestion as to pitfalls of what I am currently doing would be appreciated.  I realized that I am not using dedicated brass, optimal powder/brass/bullet for absolute precision, but at least at present, I am looking for ideas of what I can do to optimize the current load.

jlow

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Join date : 2019-01-06

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Re: Looking for help reloading 9mm.

Post by 9146gt on 1/13/2019, 10:12 am

Plunk and twist test is probably the most important test on a PCC style gun...many have a short feebore.
Tom

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Re: Looking for help reloading 9mm.

Post by jlow on 1/13/2019, 1:06 pm

I have done the plunk and twist test, and this gun has a very long freebore, long enough that I could not reach it with a really long load.  I asked this question here and received a good response here:


http://www.bullseyeforum.net/t11217-sig-mpx-9mm-barrel-plunk-test-strange-results?highlight=strange

jlow

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Re: Looking for help reloading 9mm.

Post by jlow on 1/13/2019, 7:32 pm

I have done some research on the Hodgdon website and found a load for 115gr Speer Red dot JHP which I presume is close to the Zero's 115gr JHP.  Looks like they recommend a COAL of 1.125" and titegroup range betwee 4.5gr (low) to 4.8gr (max) for an MV between 1,135 and 1,258fps.

Anyone use something like this and I wonder how well that works?

jlow

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Join date : 2019-01-06

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Re: Looking for help reloading 9mm.

Post by AHI on 1/13/2019, 9:40 pm

Delite


Last edited by AHI on 1/14/2019, 7:16 pm; edited 1 time in total

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Re: Looking for help reloading 9mm.

Post by AHI on 1/13/2019, 10:31 pm

delete


Last edited by AHI on 1/14/2019, 7:17 pm; edited 1 time in total

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Re: Looking for help reloading 9mm.

Post by jlow on 1/14/2019, 8:11 am

AHI thanks for writing in.  A couple of points.

1)      The MPX always had a 16” barrel option. AFAIK, the new PCC version is only different barrel wise by having the barrel being 16” when the comp is removed.

2)      I am sure there are other PCC and other bullets with good precision but that does not help me.  I am looking specifically for reloading information for Zero 115gr JHP for a SIG MPX.

jlow

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Join date : 2019-01-06

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Re: Looking for help reloading 9mm.

Post by AHI on 1/14/2019, 9:03 am

delite


Last edited by AHI on 1/14/2019, 7:18 pm; edited 1 time in total

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Re: Looking for help reloading 9mm.

Post by jlow on 1/14/2019, 9:10 am

Maybe they changed the rifling but there is nothing in their announcement to suggest that.  Regardless there is nothing I can do to change that.

I have my barrel and I have the Zero's on order so at least in the short term, I have to work with that.

Will try what you suggested if I don't get any more info.  Thanks.

jlow

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Re: Looking for help reloading 9mm.

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