CZ bore concern

168bergersapper

168bergersapper

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I recently purchased a brand new CZ455 varmint in 22LR. I took it to the range for the first time last weekend. I ran some tests with a few different kinds of ammo (lapua,rws,cci,eley) all with poor results (1.5 a 3" groupings@50m). Very unhappily I went home. As I started to clean it I discovered the 1 piece 22cal Dewey rod and nylon brush I use in all me other 22's (including a precision aftermarket match barrel on my 10/22) wouldn't fit down the bore. I then tried it without the brush with the same result. It will enter breech end for about 4 inches before it becomes so wedged I have a hard time pulling it out. I ran a pull through through it a couple times and then tried the rod again but still it would not budge. Has anyone ever encountered such an issue? Do I have a serious issue and /or could this be related to the poor accuracy?
 
CZ lists on their FAQ section that their .22s are actually bored to .221 and recommend either a .17 or .20 rod. My brand new carbon Tipton .22 rod wouldn't fit in my new 452 Ultralux. Good for accuracy they say. I only run lead tipped bullets down mine - jacketed are not as accurate.

http://cz-usa.com/support/faq/

Q: “I’ve heard you use tight bores in your .22s, is that right? What does that mean?”

A: Our .22 LRs use our cold hammer forged and lapped barrels, and are built a bit tighter than many other guns. In .22 LR we run a .211 bore, which is one of the reasons our .22s are known for incredible accuracy. This also means that a .17 or .20 rod and jag are required for cleaning, since a .22 rod will be too large. Additionally, use of .22 Short, Long and Sub-Sonic ammunition isn’t recommended because of the tight bore.
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You tried quality ammo in it, you should have better results, thats weird.

What was your shooting setup ?

And for the cleaning rod, that's good to know !
 
ben777lemay said:
You tried quality ammo in it, you should have better results, thats weird.

What was your shooting setup ?

And for the cleaning rod, that's good to know !
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Right now I have a leupold vx1 4-12x40 mounted on it. I've already installed an adjustable sear and lighter trigger spring. I'm shooting off of a Baldeagle front rest and rear bag.
 
168bergersapper said:
Right now I have a leupold vx1 4-12x40 mounted on it. I've already installed an adjustable sear and lighter trigger spring. I'm shooting off of a Baldeagle front rest and rear bag.
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Once you have a nice target scope it should shoot well.. I use CCI standard & RWS subsonics and it's very good , had the same issues with the tight bore and bought a thinner rod ...
 
Without having seen your rifle setup, I am inclined to believe that you have a problem with your scope or mounts. CZ's are pretty good rifles and I would be surprised if it wouldn't shoot the ammo you have well. I would recommend that you check the action screws, check the barrel screws (455 have removable barrels) than check the mount screws. If everything comes up tight, try your various ammo again but be sure to tap on the scope adjustments with a finger to ensure that your springs have set properly. I believe that the VX-1 uses friction plates so it may be that the first few shots were on an "incorrect" setting and than the adjustment took. I have noticed that they are sometimes slow to adjust in the colder weather as well. Hope your rifle shoots better.
 
next time your at the range look through the scope as if your going to shoot the rifle, then move your head side to side and up and down all while looking through the scope, if the cross hair is walking all over the target without the rifle moving in the rest then you have a serious parallax issue and this will explain the poor groups, everytime you go to shoot the rifle your in a different position and so the crosshair is showing on a different location on the target
 
Sounds like a scope issue as others have said. Try some SK Std Plus both my Czs prefer it.I have not had an issue running my Tipton 22 cal rod down either barrel. Also if using lubed ammo make sure it's warm as it's not designed for cold weather. Yes check action screws. Also make sure the bullets are not hanging up and getting gouged when cycling. I doubt it s the rifle.
 
Parallax issue...You need an AO scope or a rimfire scope to shoot under 100 yards without being limited by the parallax issue. You're rifle is most likely a shooter. Get the scope sorted out and you'll be good to go.

Thanks,
Cal.
 
yodave said:
next time your at the range look through the scope as if your going to shoot the rifle, then move your head side to side and up and down all while looking through the scope, if the cross hair is walking all over the target without the rifle moving in the rest then you have a serious parallax issue and this will explain the poor groups, everytime you go to shoot the rifle your in a different position and so the crosshair is showing on a different location on the target
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I bet its the problem. Most Leupold have the parallax set at 100y from factory.
I think you can send your scope at Korth and they can set it at 50y.

IMO an AO scope is almost a must on a rimfire.

Oh and a Yodave trigger spring kit also help to tighten groups ;)
 
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