9mm reloading question

[ANDERSON MEDIC]

I am relatively new to reloading. Over the past few months I have been reloading 9mm, using a 124 gr montana gold sourced from magnum materials booth at the gun shows. I have had great success with the recipe that i used.

 

Today i picked up some 125 gr JHP bullets from the same booth. I looked around for load data from several sources and was universally advised on using 3.8-4.2 gr charge of Titegroup (which i started at 3.8), with a OAL of 1.075". I could not find what the minimum OAL would be from any source. The bullets weighed in at 124.4 gr adn had a diameter of .355 as they should. After loading a batch of 20 to a OAL of 1.075-1.078, with a mouth diameter of 0.376 I am having trouble feeding them into my CZ P-01.

 

I will release the slide and chamber the round. Upon testing the feed/extraction I found it to be VERY difficult to extract. With great force i extracted the round and saw contact marks on the ogive about 1/8' past the case mouth. So I see where it is getting stuck.

 

I usually run either fmj or hornady critical defense 115gr rounds in the CZ, which have a much steeper taper to the tip, and have had zero malfunctions.

 

My question is, what is the minimum OAL for this load? It seems as if i seated the bullet deeper it would be narrower at the point where it was getting stuck, but i dont want to risk increasing the pressure to a dangerous point. Any other thoughts?

 

Oh, BTW, the same rounds that got stuck in the CZ fed and extracted normally with normal effort in my S&W M&P 9c.

[ANDERSON MEDIC]

Also just was told by my brother that he tested the feeding and extraction of these rounds in his Sig P226, and they fed and extracted normally.

[Guest Lester Weevils]

Hi Anderson

 

You probably know this, but some CZ75's have been alleged to have a "short chamber" where certain shapes of bullets wedge into the beginning of the rifling. I've not run into a bullet my CZ85 won't shoot, so dunno from personal experience. Threads such as this.

 

http://www.thehighroad.org/archive/index.php/t-74759.html

 

I THINK I've read in the past about ways to ream off the rifling a little bit to make a CZ less sensitive to this, but might be remembering incorrectly.

[Dave Shooter]

You may want to make up a dummy round, and with the barrel removed from the gun drop the dummy in.  Adjust the seating die deeper until base of the case is flush with the barrel hood.  That should tell you what the maximum length for that bullet in that barrel.  You can then load some live rounds starting with a low charge and work up till you get what you want.

[Raoul]

I had a similar problem with a LRN 225 gr in my Remington .45. I shortened the load just enough to fit the chamber with no problems.

FWIW SAAMI shows a minimum OAL of 1.00 for 9mm.

Edited January 28, 2013 by Raoul

[Dolomite_supafly]

Not sure if you would want to but you might run the gun by a gunsmith and have them check the chamber. I have seen guns with hardly any throat at all.

 

Dolomite

[ANDERSON MEDIC]

Hi Anderson

 

You probably know this, but some CZ75's have been alleged to have a "short chamber" where certain shapes of bullets wedge into the beginning of the rifling. I've not run into a bullet my CZ85 won't shoot, so dunno from personal experience. Threads such as this.

 

http://www.thehighroad.org/archive/index.php/t-74759.html

 

I THINK I've read in the past about ways to ream off the rifling a little bit to make a CZ less sensitive to this, but might be remembering incorrectly.

Interestingly enough this article stated that this was a problem people were having with the P-01, as opposed to other models. I want to be able to use all of my handloads with this pistol, not just the fmj. I was just curious to find out if there was data available for seating the depth at a lesser depth, such as 1.000. And if so, where i should start with powder charges as I don't want to produce dangerous pressures and a guess at what charge weight i should use at that length would just be a shot in the dark.