"9 MAJOR" Load Development for Checkmate & others

[newageroman]

WARNING: Extremely High Pressure Loads.
These loads can ONLY be fired in guns specially constructed for "9 Major", such as the CZ Czechmate pistol. Any use of this high pressure ammo in standard 9mm pistols WILL be dangerous for the shooter AND the firearm. Use this information at your own risk.

[newageroman]

Yes I used your list and got what I could for powders.
The AA7 might not be too bad for me if I measure and confirm weights with an off press PM - which is what I did for these test rounds. It wasn't too bad and gave confidence in the load.

[Bossgobbler]

Power Pistol powder is a little fast for 9major loads and will be hard on your gun.
 With 124gn bullet 3N38, you are going need 8.4gn+ to make major. 124gn bullet N350 will make major with 7.0gn+.
if you can get some Shooters World Major Pistol powder, it's the powder that is the easiest to use. You can make Major with 115gn & 124gn/125gn bullets without filling the case. With 115gn bullets 10.1gn+, with 124gn/125gn bullets 9.1gn+. you can get Major Pistol powder from Powder valley & Grafs & sons. You will use be surprised how fast you can use 8# of this powder.  Two-three matches and seme practice in a month and you will use two lbs.
AA7 has a reputation for eating comps by eroding the metal.

[newageroman]

yes I'm on the hunt for SWMP/ paycheck comes Friday.
I'm thinking whatever I don't use for Maj I can load for plinker ammo.

Looking at the filled case with it looks like the bullet base of the 124PD  and COAL of 1.155" is pretty close to the top of the powder. I couldn't imagine stuffing another 3 grains in there. Wondering how much capacity would be in the case uncompressed. Depends on the powder of course.

[M1A4ME]

When it cools down enough to reload in the shed again I've got some AA#7 (and BE86) to work up some 124 grain JHP loads with.  The M&P did it's (poor) best with 124 grain Win. FMJ NATO factory loads that are supposed to be around 1200 fps (per the Winchester web site).  I'd like to try to get to that velocity for the hollow points to see if I can get that darn thing to shoot a little better.

Sure would be nice if they shot nice groups in the CZ's, too.  I'll find out in a couple months.

I saw some of the Shooter's World powder at a gun show either early last year or as summer was approaching.  I almost bought some but at the time the guy selling it wasn't too helpful about reloading data for it so I walked away from it.  Haven't seen any since.

[Bossgobbler]

When loading 9major you are going to use compressed loads with most powders.  The slower burning powders don't have a problem being compressed.  All of the VihtaVuori powders will be compressed to make major. With SP the base of the bullet will be just touching or slightly compressed.