9mm 128 gr from Lee mold ...

[Willee]

Cast some boolits for my 9mm a few days ago.
124 gr round nose (LEE mold 90465)
Water chilled them for extra hardness.
Sized them to .358 in a Lyman sizer loaded with with RCBS green lube.
Ready to use weight was 128 grains.

Loaded them with 4.0 gr of WIN 231 and fired some today.
They chronographed around 1100 fps and shot very well.
No signs of leading in the stainless steel 6" WOLF barrel.
They cycled the Glock 24 action (15 lb recoil spring) without a failure.

The case shows no signs of bulge but the primer looks like there might be excess pressure. Attached are some photos.
Do you think this is a bit hot for this bullet?
I am thinking of backing the charge down to 3.6 gr to try and slow the bullet down to around 900 fps.

Willee

[Cherokee]

The primer indent in your picture looks like the multitude of 9mm brass I have seen that has been fired in a Glock - in other words, normal for Glock fired. Your load is fine.

[fecmech]

You're not even close to max IMO. If you want to go to 900 fps that's fine but I wouldn't do it because I was afraid of that load.

[ku4hx]

Your primer looks like ever primer I've ever touched off in any of my Glocks. I'd say you have a winner of a load. Based on current Hodgdon/Winchester load data, 4.0 grains is well within min-max load limits.

http://data.hodgdon.com/main_menu.asp

[40Super]

I use 4.4gr Hp-38 with my 121gr fp without problems, so you should be good. Those square marks are normal for Glocks

[Shiloh]

+1 to what Cherokee said.
There is always a rectangular area framing the firing pin strike on Glock brass. Your primers still have a rounded edge, and look quite normal.
See if there are some WCC military type brass in your collection. That brass is thicker and therefore has higher pressure with the same load.

WCC primers after firing will be flat in the area where yours are still round.
I don't see excessive pressure from the pic that you posted.

Shiloh

[Able 5]

concur with all, primer looks fine. I will be testing some 130gr today myself.