Originally Posted By usmcchet9296:
I think its apples and oranges comparing the 452 and 455
I have had a 452 and still own a 455PVT and both are great rifles
if I were to choose between one I would probable lean towards the 455 as there are more upgrades for it
my 455
<a href="https://flic.kr/p/g9MZgD" target="_blank">https://farm4.staticflickr.com/3670/9944856183_777fce2294_b.jpg</a>image by John Hermesmeyer, on Flickr
my 452
<a href="https://flic.kr/p/9cE915" target="_blank">https://farm6.staticflickr.com/5245/5382776772_5533a5e5c2_b.jpg</a>CZ452V (5) by John Hermesmeyer, on Flickr

Originally Posted By SteelonSteel:
There are different stock screw set ups for various 452's;  single screw for youth scout, two action screws for most of the others, varmint has one screw into the rear of the barrel.  

Originally Posted By mic214:
I bought my first CZ 452 from a neighbor a couple of years ago It is marked "SUPER BRNO SAA 2500" on the top of the barrel, which is 29" long. On the side of the receiver is it marked "CZ 452-2E ZKM". It is an absolute tack driver. I am still working out the proper scope and ring configuration. Right now I have a Tasco 3x9x40 scope mounted on it with a pair of BKL off-set rings.

Originally Posted By Crash41984:
I'm ordering the 455 Varmint in the next several weeks. From what I understand, CZ is pretty much the standard for 22lr bolt guns unless you want to shell out close to or over a grand for a Sako Quad. Personally, I can't bring myself to pay mid range AR prices for a 22lr, but I digress.

Originally Posted By 3221:


The cz lux's (lux & super lux) have the hogs back stock design which makes it hard to get a good cheek weld with the lower combed hog back design. To get the scope lower you need a lllloooooonnnnnnggger bodied scope. I use my 1996 cz lux for silhouettes, here's a picture of the lux setup with a long bodied sightron 24x.

A couple years back I swithed over to a long bodied lyman all americam 20x. Note how the eyepiece of the lyman sits back further than the sightron. You can always tell a shooter that sits on a bench compared to an off-hand shooter. Typically the end of the eyepiece is in front of the palm grip on the stock of people that sit to shoot. If you tried shooting offhand with the scope that far forward you'd have to "crawl" the stock when standing to be able to see thru it.

To the op:
Sorry for the thread drift. If it was me, I'd go for the 455. There's nothing wrong with the 452's, heck I've owned 1 for decades. CZ decided to put a rimfire model out that could easily be changed to a shooters specific needs for a reason. The ability to take the bbl on and off is huge!!! You might not have any interest in doing anything or changing anything on a cz 455 right now.

But what about your future needs????

As your shooting capabilities evolve you should own a rimfire that can change/evolve with your needs. There's already been trigger work brought up but there's more to tuning a rimfire than a trigger spring and bedding the stock. Look at it this way, you do the trigger work & bed the stock & go out and start shooting/practicing. You keep getting better & you start buying better ammo. Things keep improving until all of a sudden you hit a wall. Doesn't matter what you do, some days will be better than others, some days there more wind than others, etc. But at the end of the day you'll find that after all the practice, improvements, better ammo you'll be sitting at just under .200" average for 4 5-shot groups @25yds and around 1/2" average for 4 5-shot groups @50yds. Can you do better on a given day??? Absolutely!!! But you'll find that over a period of time that for every time you shoot a 3/8" group @50yds you'll also shot a 5/8" group (darn flier). It's hard to put 20 shots together into the proverbial "I can shoot 1/2" groups all day long".  To put it in perspective, they have 13mm game over on rimfire centeral, the idea of the game was for all those I can shoot 1/2" groups all day long shooters to go ahead burn some ammo and give it a try. Heck 13mm is bigger than 1/2". Simply shoot 4 5-shot groups @ 50yds, measure the 4 groups and add them together and then get the average for those 4 groups. If the average was under 13mm you were up to the challenge. For some odd reason since 2011 there's 64 people on that list shooting their sporter rifles. Why post this???

Because if the guys that use/shoot rimfires all the time are averaging 9mm with their cz's over a 5 year period, then you have a benchmark/something to shoot for (no pun intended). When you hit that wall you will find that it's because you've reached the mechanical ability of your cz, hence you're better than the rifle. So now it becomes replace the rifle or improve the rifle. CZ understands this and has came out with a rifle designed to allow you to do just that without spending allot of $$.

I don't know what the CZ 455 bbl's chambers are but the older 452's have the european 18mm sporter chamber (so do the older anschutz 64's from the 80's/90's). While being allot tighter than their US counterparts, they are not a match chamber by any means. They were supposed to "tighten" the chambers up on the 455's compared to the 452's. Here's what cz has to say about their 455 chambers.

<span style="color: blue;">Q: “Can I shoot CCI Stingers or long-for chambering Sub-Sonic ammo in my CZ?”

<span style="color: red;">A: Our .22 LR rifles are built to tight tolerances for increased accuracy, and our chamber is what other manufacturers might refer to as a ‘Match’ chamber. The tight tolerances mean overly long cartridges may not fit, so Stingers and some large sub-sonic loads will be too long to allow the bolt to close. Also, we warn customers against using sub-sonic loads because of our tighter bores.

What that's telling me is that they are not using a true match chamber. When a mfg says "May not fit" that means that the chambers are cut right at the minimum tolerance allowed for the case to fit in the chamber. A chamber reamer chart, the 452's used a 18mm or .700" (lakefield chamber), the 18mm is the C measurement on the chart. A stinger case is .700" long compared to the standard .600 for a 22lr.

Which makes me believe that cz is still using the 18mm chamber. Why is this important??  Note that the "stinger" chamber on the chart is .735" and .735 - .700 ='s .035". Allot smarter people than me figured out that rimfire ammo/chamber combo's are at their best/most accurate when the chambered round has around 30/1000th's to 40/1000th's  (.030"/.040") of the bullet seated into the leade of the throat of the chamber.

Finding the magic bullet:
Typically match ammo is short, allot shorter than hunting/blammo ammo for example. Low grades of match ammo tend to be longer than the higher grades. When measuring different 22lr ammo I found that eley black box was as much as 70/1000th's + (.070"+) shorter than most of the hunting/plinking/blammo ammo. And the lower the grade of match ammo, the longer the ammo got. The sk+ was 50/1000th's+ (.050"+) longer than the eley black box.

Longer chamber ='s longer bullet ='s accuracy from bullet fit in the chamber.

The "eley esp" chamer is .617" and most eley eps ammo I've measured around .655" at the beginning of the drive bands of the bullet and is extremely consistent. The sk+ & sk pistol match ammo on the other hand measured around .710" and had as much as 20/1000th's (.020") difference in length with the majority of it being longer.

Why all this??
Because, you'll find that the chamber in your cz is at it's best with longer ammo. The problem is the longer ammo is also the cheaper, not as well make ammo. So when you get better and put everything together you're shooting abilities will reach the limits of your ammo. The 455 has a removable bbl that can easily be set back 1/8" and the chamber recut with a true match chamber reamer for little $$. I've done this on several 22lr bbl's, it's easier and cheaper than buying a new bbl. I like to use the PTG match reamer because I tend to use the middle of the road match ammo which is typically is around 20/1000th's (.020") longer than the eley eps and 30/1000th's (.030") shorter than the sk+/pistol match. At the end of the day you have to match the match ammo to the match chamber of your bbl. Don't think so??? Then why are so many people doing so well with the same ammo/chambers???

The other area that the CZ's need improvement on is their bolts. Most serous shooters buy after market extra power striker/firing pin spring and call it good. Most shooters don't test their rimfires for consistent ignition and consistent ignition ='s accuracy. When I get serous about a rimfire and decide to tune it, consistent ignition is the 1st thing I do. I have bought cases of ammo, not because it was extremely accurate. Because they had an extremely low sd. If I found a low grade ($600/$700) a case match ammo that had a low sd I'd buy it. I use that ammo as a benchmark to test firearms with. If I got a sd of 10 or 11 for a 20-shot string out of several different firearms with that ammo and got a sd in the 30's when testing a new firearm. I knew I had a problem. The CZ lux pictured above I had for years, really enjoyed it but never really did anything with it but use it as a range plinker. Back in 2008 I decided to take a hard look at it and really see what it could do. I wanted to set it up for silhouettes and started testing different ammo. I kept getting around 1/4" 5-shot groups @25yds and around 1/2" 5-shot groups @50yds. Basically nothing special and I had 5 other match grade sporter rifles to use for sporter rimfire silhouettes already. Just liked the CZ so it was time to give it a make over. Ended up taking the bolt apart and polishing everything internal, reshaping the firing pin to get the correct hit/depth. Replacing the striker spring and treating all the metal with moly. The last thing I did was polish the leade of the chamber and moly treated it. The end result was the work vastly increased the lock time of the bolt and reduced the groups of that rifle by 40%.

Before the work the lux did 1/4" groups. Same ammo after the work, 4 5-shot groups @25yds shot in 36* weather no less.

Better weather @50yds with sk pistol match.

Anyway, you'll find that if you keep at it your shooting abilities will exceed the ammo that is the best fit for your cz's chamber. That's why people say test lots for that "magic bullet". It's easier to find that "magic" bullet in the higher priced ammo and the 455 will allow you the advantage of customizing/optimizing the chamber to better match the higher priced highly accurate ammo.

Originally Posted By crashburnrepeat:
am I the only one that cringed and hurt a little with those nice .308 cases with holes in them? Cause I cringed a little....  

Originally Posted By usmcchet9296:
I think its apples and oranges comparing the 452 and 455
I have had a 452 and still own a 455PVT and both are great rifles
if I were to choose between one I would probable lean towards the 455 as there are more upgrades for it
my 455
image by John Hermesmeyer, on Flickr
my 452
CZ452V (5) by John Hermesmeyer, on Flickr