CZ 455 Accuracy - Not what I expected

shellbird01

shellbird01

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Tough day at the range. I torqued the barrel set screws starting at 32"/lbs up to 44. I also torqued the action screws starting at 18 up to 25"/lbs. Not good. I used winchester 333, Rem Subsonic, CCI Std Velocity, Winchester target, American eagle, Eley Target & Eley match. What a mess. The Cci & Subsonic grouped best but still had 1.5 - 2" fliers.

Is this what I should expect for CZ? Not from what I've read. I'm thinking I will trade it on an Anchutz or something. This gun isn't squirrel MOA (I noticed misses Squirrel hunting that didn't feel right) but I'd feel guilty giving someone that gun.

I was using a quality rest, have a Yo Dave trigger kit installed, I shoot reasonably well (better than those groups), in fact the gun shot better 1st when I bought it, it has about 2K+ rounds thru it. The scope is a VX-III 4.5 - 14 Leupold.

Any thoughts?
 
Range? My CZ shoots about 1.5 MOA with CCI sub-sonic at 100 yards. I guess wind is a factor since the groups shrink to sub-MOA at 50 yards.
 
Yep, pretty much the same result as above. I got CZ 452 Varmint in 22 WMR. I got about 1.5 MOA at 100 meter and sub MOA at 50 meter.
 
KND said:
Yep, pretty much the same result as above. I got CZ 452 Varmint in 22 WMR. I got about 1.5 MOA at 100 meter and sub MOA at 50 meter.
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^that would likely be an ammo thing. I don't think 22WMR is inherently accurate, but I would think a 452 Varmint could print better than that. How many types of ammo did you try with it?
 
Range was 50 yards. I was considering Pillaring & beding but now would like to trade it. The gun is new, I wonder if torquing the screws will void any warranty?
 
shellbird01 said:
Tough day at the range. I torqued the barrel set screws starting at 32"/lbs up to 44. I also torqued the action screws starting at 18 up to 25"/lbs. Not good. I used winchester 333, Rem Subsonic, CCI Std Velocity, Winchester target, American eagle, Eley Target & Eley match. What a mess. The Cci & Subsonic grouped best but still had 1.5 - 2" fliers.

Is this what I should expect for CZ? Not from what I've read. I'm thinking I will trade it on an Anchutz or something. This gun isn't squirrel MOA (I noticed misses Squirrel hunting that didn't feel right) but I'd feel guilty giving someone that gun.

I was using a quality rest, have a Yo Dave trigger kit installed, I shoot reasonably well (better than those groups), in fact the gun shot better 1st when I bought it, it has about 2K+ rounds thru it. The scope is a VX-III 4.5 - 14 Leupold.

Any thoughts?
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1. Distance? If that was @ 100 yards and there was even a slight breeze, that could play a big part
2. Ammo~I personally wouldn't expect good groups from my CZ using the Rem Subsonic, Winchester Target, American Eagle. My 452 Varmint likes CCI Standard, SK Standard, but loves CCI Blazer best
3. All of that torque business~all to CZ specs? Curious as to why you started with that. I've never touched the screws on my 452 Varmint! lol (I know there are no barrel set screws on a 452)

Only other questions might have to do with the scope. I trust it was tight, and it's a good scope for sure. Does it have AO? Reason I ask, allot of scopes have a 100 yard parallax setting...most rimfire-specific scopes are set to 50 yards. AO means you have total control over it, but if it's not set to the right distance...the reticle can appear to move around.
 
Thanks for the replies, Gunnuts is awesome!

1. Range 50 yards
2. I used CCI Std Vel and was sorted by weight, probably my best round but those 2" flyers
3. Torques are based on info from Rimfire central, was hoping to tweak a little more accuracy but made it worse

Scope has AO

thanks
 
shellbird01 said:
Is this what I should expect for CZ? Not from what I've read.
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No, the factory standard is 1" or better at 50 yards. Good luck getting joy on that through Grech Outdoors (current warranty center) :( best bet is to PM RFC member djdilliodon and fix it up yourself.

shellbird01 said:
in fact the gun shot better 1st when I bought it, it has about 2K+ rounds thru it.
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How's your cleaning routine been? Fouling, especially in a new gun builds quickly, and will ruin your range day. Can you post some of your groups? Which way are the fliers going? I'm working out bugs in my own 455 and am getting a lot of vertical, perhaps related to an ignition issue. Don't bother pillaring/bedding until you get those groups under 3/4", it won't cure the gross accuracy problem you're having and if you can't cure it, then the rifle is more "sellable" in a non-modified condition. May want to have a gunsmith take a peak in there with a borescope too (my factory barrel had a defective chamber/leade) so if you have something similar in the barrel at least you won't waste time chasing accuracy that will never be there, or know barrel is good and chase the real problem down.
 
.22LRGUY said:
^that would likely be an ammo thing. I don't think 22WMR is inherently accurate, but I would think a 452 Varmint could print better than that. How many types of ammo did you try with it?
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My local has limited supplies of .22 WMR so I think it is CCI .22WMR V-MAX, will check the brand tonight to be sure. Honestly, I'm happy with 1.5 MOA at 100 meters for rimfire. My Coyote and Cadex Guardian can do 1/2 MOA all day longs if I do my parts.
 
I'm no expert, but it sounds to me that the OP has not found the right ammo for his rifle yet. My CZ would probably return similar results with the same ammo he used. However with the right ammo for the specific rifle the results improve greatly. With my current CZ rifle RWS is the only ammo that is capable of consistant sub 1MOA groups @ 50 yds. My previous CZ preferred SK Rifle Match. I have Beretta ARX that will spray bulk ammo in 3"-4" groups at 50 yards, but will put SK Rifle Match into one ragged hole.
 
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Well..... I'm confused about cleaning, I'm glad you brought it up. I only run a bore snake thru. I've read may forums that say don't clean at all. I bought a bore guide but the 22 dewy does not fit. The "ridge" in the action is too high. I did read a 17 would do it. What do you suggest???

Thanks!
 
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Which RWS ammo did u use, was it 50? I would like to try some SK ammo but I wasn't able to find any on the internet for Canada. I hear people are having luck with CCI Mini Mags too.
 
I use a Tipton 22 rod, but usually remove the bolt guide before thorough cleaning, which in my case is every 500 rds. I rounded the sharp edges on my bolt guide/ejector pins also.
For every day cleaning, I use one of Dr. Gunner's pull throughs to remove powder residue, two dry patches followed by an oily one. Then a couple dry patches before I shoot the next time.
Hirsch Precision is expecting a shipment of SK ammo in mid to late November.
You may want to do some reading on RFC on firing pin shape and its effect on rimfire ignition. I'm not saying it'll cure anything, but it's interesting reading if nothing else.
 
shellbird01 said:
Tough day at the range. I torqued the barrel set screws starting at 32"/lbs up to 44. I also torqued the action screws starting at 18 up to 25"/lbs. Not good. I used winchester 333, Rem Subsonic, CCI Std Velocity, Winchester target, American eagle, Eley Target & Eley match. What a mess. The Cci & Subsonic grouped best but still had 1.5 - 2" fliers. Any thoughts?
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The Winchester 555, 333, 222, is all garbage. In fact I have never seen any Winchester ammo shoot well. Have not found Federal that shoots well either. I have had decent groups under 1/2" average from Remington Subsonic. CCI Standard Velocity sort of OK, but not as good as the Remingtons. There is no excuse for the gun not to shoot Eley Target and Eley Match.

This is what my Savage BTVS shoots with a variety of ammo. The range is huge from close to the 1/4" range with Eley Tenex to almost 2" with the garbage. My thoughts would be to sell it and buy a heavy barrel Savage. The trigger can be tweaked down to under 1 lb, and the price is reasonable. Getting an Anschutz is not a sure win. My Savage shoots as well or better with high end target ammo as a friend's sporter Anschutz. If you want all out accuracy with an Anschutz you need the heavy barrel like the Savage, and ideally the model 54 action.

22LRTest2016-06.jpg
 
shellbird01 said:
Well..... I'm confused about cleaning, I'm glad you brought it up. I only run a bore snake thru. I've read may forums that say don't clean at all. I bought a bore guide but the 22 dewy does not fit. The "ridge" in the action is too high. I did read a 17 would do it. What do you suggest???

Thanks!
Click to expand...

this was covered before in the past. CZ barrel are tight I used a Tipton .20 or .17 rod in my 22LR
 
shellbird01 said:
How do you remove the bolt guide?
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Once the barreled action is out of the stock, remove the mag well screws. The rear mag well screw also secures the bolt guide.
I usually remove the mag well before I do any serious cleaning, bore solvents and plastic aren't a good mix in my experience. The retaining screws need a very light torque when reassembling the rifle, it's easy to crush the plastic.
 
shellbird01 said:
How do you remove the bolt guide?
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Take the action out of the stock and you'll see two 3mm hex screws holding the magwell, the rear screw goes up into the bolt guide. Remove the screws, take out the magwell, and the bolt guide will be free to slip out the rear of the action, pull the trigger to drop the sear out of the way and of course the bolt is out first. I use a .20 cal rod and jag with thick cotton patches. What you wanna focus on though is the chamber area as after 2K rounds and the cleaning you've described you're gunna have a heck of a carbon ring/lead buildup in this area. I'd be using JB bore paste for the most efficient removal of this fouling otherwise bronze brush the heck out of it with generous solvent, soak well overnight and brush brush brush again. This stuff is tough! You won't be able to verify complete removal without a borescope but as long as you've given it the scrubbing of a lifetime it'll be mostly removed and the CZ chamber is loose enough that it'll take hundreds of rounds to build up and affect accuracy again.

http://www.nordicmarksman.com/SK-HV-Hollow-Point-50.html

Nordic Marksman has SK HV HP, excellent for hunting ammo vs. mini-mags. Headshots on squirrels all day long outta my CZ, excuse group 1 when switching ammo brands the lube has to re-distribute before groups tighten up.



 
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