CZ-75 leade/chamber variations between models?

[Tim the Enchanter]

I was shooting the same batch of my reloads at the range today, using a CZ-75b and a CZ-75 SP-01. The SP-01 had no issues with the ammo, while the 75b had three nasty failures to feed, each necessitating breaking down the pistol, removing the barrel and tapping out the stuck cartridge.

Clearing one of these jams resulted in the bullet being stuck in the rifling, the case coming being pulled out as the slide was racked back, resulting in powder spilling down the mag well.

I've been trying to narrow down what caused this, and so far I've eliminated dirty chambers (less than 50 rounds fired), bulged cases (cartridge drops right in the SP-01, not so for the 75b).

Could the problem be in different chamber dimensions or perhaps a different angle/length of the leade causing LRN bullets to bind?

Strangely enough, both pistols fed plated and jacketed ammo loaded to the same dimensions without fail.

link to hi res pic with details

 

[Kyle]

I had a similar probelm, I loaded up som 124gr hollow points Berry Bullets. To the same oal as some other HP bullets I had. They worked fine in all of my guns except my cz75b. The round wasn't headspacing on the brass like it should, the bullet was jamming in the throat of the barrell. I quit using these bullets in my cz75, and just shot them up in my other guns. I have been told the cz75's have shorter leades before the rifling than other guns.

 

[hovbuild]

I use the berry hp's and have no feeding problems in y 75b. OAL is 1.025