alsaqr
Member
I have the CZ 527. The chamber is cut to such tight tolerances that fired brass is hard to tell apart from new brass.
You hit on something very important there. The SAAMI spec chamber for the .22 Hornet is big and sloppy, some of the accuracy problems with the .22 Hornet are caused by that SAAMI chamber. European chambers are much tighter and the cartridge cases last much longer. i have a European spec chamber reamer a tool and die maker friend made for me.
I discovered a few years ago what the Europeans have known for a long time. The standard American chambers for Hornet rifles are much too loose for good accuracy. The European guns in .22 Hornet (5.6x35R) have much tighter chambers and as a group, shoot far better. This chamber-dimension discrepancy goes a long way toward explaining why Hornets have such a spotty accuracy history. Some guns shoot great, and some are worse than ho-hum.
http://archives.gunsandammo.com/content/the-22-hornet
i've been reloading the .22 Hornet since 1952 and currently own several guns in that caliber; my favorite is a BSA Martini that has the barrel from a Winchester model .43.
Couple times every year i get the urge to stick a 45 grain bullet from a .22 Hornet in the ear of a big wild hog.