I currently shoot a CZ with a Lilja barrel for PD's. I also have shot a savage, Bagera, and Anchutz. I shoot the CZ the most due to the availability of magazines for it. All shoot well with the Anschutz and the CZ being the most accurate for me.
I Have had this problem on a 223 Rem. The chamber reamer I used for a Bartlien barrel was worn at the case mouth area. Most factory ammo would feed but most reloads would stick. fixed by running a new reamer into the barrel to correct the tight lead area of barrel.
I have been shooting the CZ for two seasons. Reloading is a bit tricky the primer pockets seem to be soft many will blow out after just a few or on the first reload. loading .5 under max loads with 1680 and Lil gun. Trying CFE BLK next. Accuracy goes away fast when dirty.
Baldref
Ogden UT has the browning arms museum. Used to be in the train station but it has been a long time since I was there. A lot of history and a bunch of guns.