[9MM Load data needed for M&P with 3 port comp]

Hi all,

Looking for some loads to try out in my S&W M&P.

I'm running a 5" barrel with a carver custom 3 port comp.

I have 115 and 124 grain plated x-treme bullets to use.

Since powder is like unicorn blood right now i'm somewhat limited.

I have the following on hand to try out: (if it's not on the list I can't get it)

Win-231

Green Dot

SR 7625

Unique

[M&P Core w/ Carver Custom Comp (Help needed) FT feed and others]

How else is it going to be fixed if you don't take it to a competent gunsmith? Guns are not like Lego pieces where parts simply snap together and work. Precision fitting is needed in most cases when swapping parts with aftermarket ones.

Just validating my conclusion from your previous comment, no need for the lecture. I'm new to open, but no where near new to guns.

Ugh...kaching...no one said open was going to be cheap.

[M&P Core w/ Carver Custom Comp (Help needed) FT feed and others]

Sounds like a KKM barrel fitment issue. If the barrel isn't properly fitted to the slide and locking block it will take excessive force to lock up properly. Basically leaving the barrel slightly unlocked post shot. You can validate this by looking at the "Light Strike" primer hits. If the light strike hits are not dead center then the barrel is not fully locked up when the striker comes forward.

Solution I assume is take it to a smith and have them fit it?

[Hello from AZ]

Hi everyone,

Been a long time lurker and just signed up so I could get some help on my M&P.

I'm really glad to be here and think this is a great resource for the shooting community in general.

Thanks for having me!

[M&P Core w/ Carver Custom Comp (Help needed) FT feed and others]

Hi everyone,

Been lurking and reading for a while and can't seem to find the answer to my problems. So I thought I would throw this out here and hope someone can see something really wrong with my setup, loads or have experienced these problems before. Any help is much appreciated as I'm new to the open gun setup and trying to get my feet wet. I'm determined to make this thing work ahahaha...

Issue:

Light primer strike

Failure to feed (1-20 to 25 rounds)

Failure to extract (Fixed by sorting brass and pulling the bad stuff out)

Setup:

S&W M&P CORE 9L

KKM Barrel

Carver Custom 3 port comp

APEX Forward Set sear and trigger kit (aluminum)

APEX competition spring kit

Trijicon RMR on the slide (off for now getting fixed)

13 lb Recoil spring

Running 23 round mags with wolf extra power spring and Tarren Tactical extensions.

Current load worked up:

4.8 grains of WIN 231 with 115 grain x-treme plated projectile. (concerned about this load with a comp)

I've run CCI primers and moved over to Winchester primers (Same issues) and loading everything on a Hornady LNL.

Steps taken to isolate issue:

Removed comp and ran the gun with just the KKM barrel (still had issues)

loaded rounds with less OAL 1.12~.005" (Down from 1.169")

Used standard mags (still had the same issue)

Changed spring from 11lb to 13lbs

Polished feed ramp, Barrel breach and any contact surface to eliminate as much drag as possible.

Details and evolution:

The gun started stock and I put the trigger kit into it and it ran 100%. I then added the RMR on the gun and it was just as reliable as before. Then I added the KKM barrel and comp and that's when I had problems. I've only made one change at a time and evaluated the change every time to make sure it worked. I can usually get through a full mag or down to my last 4-5 in the mag before the issue pops up. Also when I reload, I seem to have the highest chance for a light primer strike (Not sure if this is significant or not).

At this point I'm wondering if I have a couple of issues. Based on reading here, I might have an undercharged load for running a comp and I'm running a recoil spring that's too heavy (timing issue on the slide???).

The feed issues seem to be when the round is entering the breach it gets stuck so the bullet might go in but the case is not making it all the way forward and into battery.

Can someone look at my load data and tell me if I should load more on the hot side. Max is 5.1 grains, but its hard finding data for a gun running a comp on it. I'm wondering if there's not enough gas to cycle the slide properly due to to the comp bleeding off 35-40% of it.