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-   -   Cz 455 american (https://www.rimfirecentral.com/forums/showthread.php?t=1151573)

dogtrialerguy 02-18-2019 01:46 PM

Cz 455 american
 
Has anyone here has luck with accuracy with there 22 mag? I have a standard barrel get like 3 inch group at 100 yds not satisfied. I got the trigger down to 1 lb no creep tried putting shims 1 1/2 " from forend tried 30 40 50 gr ammo . And recrowned barrel still no luck. Any ideas would be appreciated.

NoSecondBest 02-18-2019 02:30 PM

I've owned a dozen different .22wmr rifles over the last fifty years and three handguns. You're going to have to keep playing with ammo not only by weight, but by brand. If you find some good stuff, buy a bunch of it from that lot. The 22wmr isn't noted for being a target gun. Most of mine shot pretty decent, better than 3" at a 100 yards, but not all ammo did. My 455 shoots around 1.5" at a hundred with my better ammo.

jaia 02-18-2019 05:33 PM

Sounds like y'er suffering from the cr*ppy ammo blues.
Y'er rifle may be capable, but the ammo you were sold ain't.
Do a close visual inspection of the ammo.
Look for irregular case mouths, canted bullets, dinged or damaged bullets.
Check overall length, measure MV's and you will find as I did,
there are no U.S. manufacturers of quality 22 wmr at this time.

Roll a few cartridges on a flat surface and watch the tip wobble.
Not a good sign. :(

Try to tell me CCI makes great 22wmr ammo, I'm gonna giggle.
Federal and Remington and Fiocchi USA and Hornady are made by CCI.
Same cartridges, different labels. Browning is made by Winchester
and my results with Winchester have been disappointing.

There is no "all day long if I do my part" with the current deliveries of 22wmr I was sold.
What I get is usually 2 inch plus, five shot group averages.
Sometimes a sub moa group appears, most times 1.75 to 2 inches with odd outlier strays.

MacR 02-18-2019 07:43 PM

My 452 American shows a definite preference for poly tip ammo. 33 gr Rem Premiers in particular. I have a 6.5-20 scope mounted on the rifle and can usually stay MOA or slightly under. Other 30 grain poly comes close. Ammo is pretty much the limiting factor with .22 mags.

For hunting, I prefer 40 gr HP or the 35 gr. A22. Better penetration and expansion. 40 grain will usually stay inside 1.5” at 100.

I bought my 452 in 2001. Trigger has been tweaked, that’s it.

dogtrialerguy 02-19-2019 07:11 AM

Thanks guy I will try different ammo. Maybe I will leave the barrel shimmed maybe not. See what will work the best.

jaia 02-19-2019 08:22 AM

The 22wmr cartridge I'd like to try is made by RWS.
Not available at this time.
Anschutz North America is expecting a delivery.
Expensive stuff, price is similar to Lapua X-Act.

NoSecondBest 02-19-2019 10:09 AM

My CZ455 .22wmr shoots best with CCI 40g ammo, and pretty much does it consistently with that ammo. I've found over the years that that brand of ammo shot either the best, or close to the best out of every .22mag rifle I've owned. The 50g shot as well, but did not perform as well for hunting (little if any expansion on woodchucks). In both of my 648 and one 48 SW handguns it also worked the best.

Bradical 02-19-2019 03:16 PM

Be sure to check the following:

1) barrel is torqued to spec.
2) action is torqued to spec.
3) scope mounts are secure
4) scope is holding zero
5) try known accurate shooter (other than yourself) as a basis and to compare to
6) as others have said, hunt for the best ammo for that rifle

And, if I were you, I'd remove the shims and bring the rifle back to a "stock" configuration and track results from this point forward.

FWIW, my son's 455WMR is performing best today with Hornady's 30g. Your results may vary.

dogtrialerguy 02-19-2019 05:01 PM

I have barrel screws at 35 inch lbs action 20 rear 15 front

Rims 02-19-2019 06:20 PM

I have the same rifle and it drove me nuts for a while. I tried a little of everything till I got to CCI 30 gr. poly tips. Bingo. Shoots these lights out. I bought two bricks of the same lot number and weighed them. After culling the highs and the lows, it is very close to MOA.

jaia 02-19-2019 06:55 PM

Y'all know I'm just a waiting for someone to claim "all day long if they do their part", right? :rolleyes:
That 22wmr 50 at 100 challenge is still waiting for someone to show me just how good their batch of ammo is.
I'm still the only one who was willing to post target results of 50 consecutive shots with a 22wmr at 100 yards.
I purely would appreciate seeing just how good a full box of 22wmr can be.
The stuff that has been showing up on my doorstep from the retailers sure hasn't been what I would call good. :(

Bradical 02-19-2019 08:05 PM

Quote:

Originally Posted by dogtrialerguy (Post 11368413)
I have barrel screws at 35 inch lbs action 20 rear 15 front

Without checking my notes, your torque numbers appear to be in line. More, importantly, you know them.

I assume your groups tightened down to 3" with the shims and would open up without? Is this the case? Also, the bolt's locking up nice and snug, right? Is the chamber in spec?

dogtrialerguy 02-19-2019 08:17 PM

Actually it didn't seem to matter much I took shim back out bought another box of different ammo and get back to range as soon as weather allows.

jaia 02-19-2019 08:22 PM

Ya' know, I made a blatantly foolish assumption.
Just how are you using this rifle?
If offhand y'er results are fine. Better than I can do.
If from a rest or bipod, you might need to change the setup.

dogtrialerguy 02-19-2019 08:24 PM

It is from a solid bench with a bag just in front of action and bag in the rear of stock


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