9mm 124 LRN seating depth? M&P9c is short!

[TacticalReload]

So why have I been able to shoot my loads with 147gr Golden Saber bullets in my wife's M&P9c? Hmmm...

 

[ShrinkMD]

New Range Results!

I went today and shot 200 124gr LRN in CBC Brass, CCI SP primers, 3.4 gr Bullseye, and seated to 1.074"

I got a Avg FPS of 940, with an SD of 12.7.

Do these sound too hot coming out of a 3.5" barrel? I looked at it in Quickload, and it seemed ok. Anything longer wasn't functioning.

Out of the 200, I had one get stuck, and once or twice I needed to nudge the slide into battery. So something still isn't quite right, but overall the loads functioned well.

 

[flash60601]

I went today and shot 200 124gr LRN in CBC Brass, CCI SP primers, 3.4 gr Bullseye, and seated to 1.074"

I got a Avg FPS of 940, with an SD of 12.7.

Do these sound too hot coming out of a 3.5" barrel? I looked at it in Quickload, and it seemed ok. Anything longer wasn't functioning.

Out of the 200, I had one get stuck, and once or twice I needed to nudge the slide into battery. So something still isn't quite right, but overall the loads functioned well.

Those rounds which malfunction - eject them carefully and look at them closely.. You may be able to learn much more from three which need that "nudge" than you can from the 197 which didnt need it.

Flash

 

[ShrinkMD]

A great idea, but I forgot to do so when I was at the range. I did notice when making the ammo that a couple of rounds had trouble getting into the case gauge due to the rim having a burr or other problem. This still seems like a finicky pistol, because I have a 5906TSW which eats anything I feed it, and has not had any problems with reloads at all.

I think I may need to get a small batch of new brass and carefully figure out what OAL I need to make this pistol function. I'm a little uncomfortable loading those rounds that short, even though I think that the velocity is ok.

 

[checkenbach]

I'm new on the forum, but not to loading. I have a M&P 9mm I've been loading Winchester 115 and 124 FMJ's at 1.135" COAL with great success, no issues of any kind in the M&P or G34.
Is the brass you're using range brass, perhaps having been shot in a Glock before?????
I use a Lee Factory crimp die to get rid of the Glock guppy belly, and almost all will chamber in a Dillon case guage.
The other item could be crimp, also taken care of with the Lee FCD.

 

[OKFC05]

So why have I been able to shoot my loads with 147gr Golden Saber bullets in my wife's M&P9c? Hmmm...

Probably because the golden Sabers have a secant ogive that insures the bullet does not hit the rifling when seated to the recommended depth.
Some of the RN lead bullets have a wide ogive section and a 2R nose, and attempts to seat them long produce just the problems being posted about. The OAL is really a rotten measurement for trying to sort this out; what is needed is an ogive measurement to achieve the correct seating depth.

IMHO, seating pistol bullets to touch the rifling in a defensive handgun can cause grief, and should be reserved for range queens with long throats.