CZ 75 - short throats?

[DLrocket89]

Hi everyone,

In a couple weekends I'm going to be doing some uspsa "training" with a friend of mine...we set up courses of fire in a field and have a good time.

I'd like to do some loading so I can run the ammo I'll be competing with if possible. Load is a 147 grain ACME bullet loaded to about 850fps (just above 125 power).

The problem here is that the gun, a CZ75 SP-01 tactical (decocker), won't be in until the friday before shooting, so I'll only have time to load before the gun arrives.

My question is around COAL. Another member here, in a PM, warned me that CZs frequently have short throats. So, there exists the possibility that I could load cartridges that won't chamber properly.

So...thoughts anyone? Should I load down the center of the COAL range, shorten them a bit...I also have some 124 grain NATO I could burn up and load up a proper series of tests first, but would prefer to run the 147s if I can.

Thanks in advance!

Dustin

 

[nettlle]

Reloading for anything without the ability to plunk is probably not the best choice. You could load up some 147 ACME and take them with you but a back up plan wouldn't be a bad idea. For semi auto pistols long has always worked a little better than short for me.

 

[FN in MT]

I have an SP01 and a Shadow 2, BOTH have jammed up nicely with 147 gr ammo. I had some older RP 147 sub sonic factory and the culprit there was the CONTOUR of the bullet. After I unjammed it, one could see where the bullet jammed in the chamber.

I learned a LONG time ago...loading a quantity of ammo WITHOUT the opportunity to test at least a few rds in the intended firearm....MISTAKE.

As You probably know SHORTENING, seating the bullet DEEPER can result in higher pressures, so beware.

 

[snakeye]

I have an SP01 and a Shadow 2, BOTH have jammed up nicely with 147 gr ammo. I had some older RP 147 sub sonic factory and the culprit there was the CONTOUR of the bullet. After I unjammed it, one could see where the bullet jammed in the chamber.

I learned a LONG time ago...loading a quantity of ammo WITHOUT the opportunity to test at least a few rds in the intended firearm....MISTAKE.

As You probably know SHORTENING, seating the bullet DEEPER can result in higher pressures, so beware.

I totally agree....my CZs other CZs are notorious for short throats....I do not recommend loading for them until you have plunk checked them or checked with commercial ammo first

 

[DLrocket89]

Good to know others have had difficulties. I'll stick with my 124gn and will get some loaded up for trial work to see how it goes.

Thanks again for the replies!

Dustin

 

[sbwaters]

For me it took some time to find what bullets and load my short throad CZ-75B liked. Go to the course with what you know and trust.

 

[Rule3]

Yes they have short "throats" depending on the bullet profile used.

You can load them shorter to pass the plunk test, just reduce your powder charge accordingly and I would use a medium to slower powder not a super fast burning powder,

BUT without your barrel I would not load those bullets. Use your normal profile bullets. Why load a bunch of ammo that you do not know will feed in a new pistol!

I have a "few" CZ's.

For example the MBC 9mm lead Small Ball will not plunk test at "normal" COL but a Jacketed 9mm will.l due to the more pointed profile.

Or the lead 9mm Cone head

Can not say on 147 gr bullets as I do not use them

http://missouribullet.com/details.php?prodId=168&category=5&secondary=8&keywords=

 

[Rodentman]

Yeah, I have several 9mm's and I find the bbls vary a fair amount and I really need to test the finished load. With the variety of bullet shapes and bbl dimensions I personally find 9mm tough because one set of specs does not fit all. I don't have this problem with any other caliber.

 

[blue32]

I ran into the problem of rounds passing plunk only to hang up when chambering in my CZ. I settled on a Lee 356-120-TC at 1.030" with a reduced charge. Some bullets didn't work (MBC 9mm small ball) no matter what I tried.