Well, I had my 455 to the range today for the first time.
It did not disappoint, even though my long time away from long guns sure showed...

The indoor range I use is 25 yards, so the 455, which is sighted in at 50 meters shot quite a bit high.
Once I got a grip on the difference between point of aim and point of impact I was able to make some pretty good groups shooting offhand.
No hitches in the rifle's function, and the trigger was noticeably better towards the end of the session.
I shot Geco 40gr, SK 40 grain, CCI Green Tag and CCI bottom end stuff from Wally World.
The two German brands gave the best groups (approx. 1.5 inches @ 25 yards), but the CCI stuff, either the Green Tag or the regular grade was not too far off that.
I feel the rifle is capable of better accuracy, but it's the meat servo pulling the trigger that is the main impediment to better groups. I'll be working on that.
It still was a satisfying morning at the range though, as my little CZ was getting better groups with irons, that the two guys next to me could do with magnified optics on an AR 15.