The Original CZ Forum
CZ LONG ARMS => CZF RIMFIRES => Topic started by: Wiley Coyote on May 29, 2018, 08:15:10 PM
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A week and a half back I received a beautiful CZ-452 Grand Finale. (Rifle's a .22 LR, I know because it says so.) I posted a thread about it. I even managed to find an earlier GLOSS Leupold Vari X 3-9 E.F.R. Life has been good. Then today I got the scope, mounted it, and got ready to bore sight it with my old Bushnell unit for a Range trip in the next day or two. Amazing as it may sound, my .22-.270 Arbor for the Bore Sight will NOT even begin to fit into the muzzle. And yet it drops freely into all the other .22 LRs I have. My Dial Calipers don't fit well enough to give me dimensions I can trust. FWIW, the rifle does easily chamber & extract .22 Mini-Mag 40 gr CPRNs.
I do know the bore's larger than the .17 HMR, but can't tell about a .204 Ruger? All I know is I can't bore sight it with what I have. I'm at a loss. Temptation is to chamber a round, walk out in the back yard and squeeze it off!
Anyone else encounter anything similar? Am I being overly apprehensive? Does CZ actually use such a tight bore? I need help, it's gonna be a looong night.
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CZ.22lr rifles seem to have a tighter bore than many other .22lr chambered rifles.
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CZ rifles have a very tight bore. With my 452 American most of my .22 cleaning rods will not fit and the ones that do scrub the sides all the way down the bore. I did manage to get my calipers in the muzzel and vot measurements of
0.2005-0.2105 it is hard to hold the calipers and the rifle and look down the bore to see if I was on the lands or not.
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Bore sight it the old fashioned way. At 25 yds, put it in a solid rest, remove the bolt and look down the bore from the breech. Center your target in the bore then, without touching or moving the firearm, look through the scope. Make windage and elevation changes on the scope so that it lines up as close as possible with what you see through the bore. That should get you on paper. Reinsert the bolt and fine tune your scope with live ammo. Never owned a bore sighter. I do all my bolt guns this way.
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? measurements of 0.2005-0.2105 ...
0.2005 - 0.2008 are the measurements I'm getting.
Thanks for the comments guys. They're appreciated. Talking with others I'm finding out CZ tight bores are common. I just never encountered this before and it's made me wonder. I've got it bore sighted and ready to go to the range tomorrow. I'll have a good day with it I'm sure. Can't wait for Squirrel Season this Fall.
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FWIW, I have no trouble with my .22 cleaning rod in my 452 - Then again, I shoot Geco for bolt action, like Frank says "keep it greasy so it goes down easy" 8)
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I use a .20 cal. Dewey rod in my Cz 22's. His .17 cal rod works well for .22 cal. also, in case you have a 455 with the extra barrel.
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Got an email to Ivy for a .20 Cal rod in the works.
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I use a .17 rod specifically for my 455 ...the OTIS small breech .22 bore brush is a direct fit (5x40 thread)
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I too use a 17 rod.
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Got an email to Ivy for a .20 Cal rod in the works.
Don't know what happened with Ivy, but nothing positive ever materialized with them. Opted for Pro Shot .20 caliber rods and they work well. I did put a slight bevel on the leading edge of the 5-40 x 8-32 adapters to insure a clean entry to the chamber.