CZ 527 Varmint Kevlar

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My dad's will drop 45gr Winchester White box in the same hole all day long. Heck, it will do it with different shoters over an extended period of time and put boxes of ammo into a hole you can cover with a dime.

Having said that, what they were thinking putting in that ridiculous 1 in 12 twist is beyond me.
 
According to my CZ catalogue you can get the Kevlar with an optonal 1 in 9 twist barrel.

BUT with the fast twist barrel you can probably forget about shooting those 45grn varmint bullets. VAPORIZATION:evil:
 
yes, yes, my lord yes, they are as good as their rep. that is why i have 2 cz rifles. they shoudl come in either a 1/9 or 1/8 twist , I dont remember.
Either way , you can shoot from 45 to 70 grners with it.
 
Hmm. Looks like they got smarter. My dad got his when they first came out, and it HATES heavy bullets. It hates mid-weight bullets. What it will do with the light ones is obscene, though.
 
I got the CZ rings for my .223 527 Carbine yesterday - since it comes with open sights, rings aren't included like they are with the American and Varmint. Heavy little boogers. According to the CZ-USA website, the carbine still has the 1:12 twist, but being the contrary sort I'll still try heavier bullets also. Still haven't decided what scope to put on it.
 
The kevlar model, or at least the new production ones, are a 1-9 twist. There is no choice there. The older kevlar models ( I think pre 2002) had different twist rates but the new ones are a 1-9 twist as the standard. All other new production CZ .223's are a 1-12 twist.

Here is the twist rate info I received from CZUSA when I emailed and asked about a certain rifle last year.

Twist rates:

.17 Mach 2 - 1:9
.17 HMR - 1:9
.22LR - 1:16
.22 WMR - 1:16
.17 Rem - 1:9
.204 Ruger - 1:12
.22 Hornet - 1:16
.221 Fireball - 1:12
.222 Rem - 1:14
.223 Rem - 1:12 Unless it has the HS Precision stock it is then 1:9
.22-250 - 1:14
.243 - 1:10
6.5x55 - 1:8.6
.270 Win - 1:10
.270 wsm - 1:10
 
Thanks alot for all the info, i had read about the 527 american being one of the best rifles in the price range but I liked the look of the kevlar better, just wanted to make sure it performed as well.

What is the difference between 1:9 and 1:12 i dont know much about twist rates.
 
twist

I also looked at CZ 527, Kevlar or American, in .223 before buying Tikka T3. The T3 has 1:8 twist, and it can shoot 77-gr ammo sub-MOA. I had 1:7 twist in AR... The CZ Kevlar seems to be a good rifle, but is more expensive than Tikka, although Tikka just as (or more) accurate. I bought mine for $435out the door.
The CZ527 line is excelent for lighter bullets.
 
A heavier bullet needs a faster twist rate to stabilize well. A 1-9 twist is faster than a 1-12. the bullet makes one full twist in 9" in a 1-9 twist and one full twist in 12" in a 1-12 twist. A heavier bullet is going to travel longer distances more accurately than lighter bullet does due to the fact it isn't going to be pushed around by wind forces as much like a lighter bullet would.
The CZ 527 American and Varmint will both have the 1-12 twist and shoot lighter bullets better - the CZ 527 with the Kevlar (precision stock) has a 1-9 twist rate and will shoot the heavier bullets better.
I'm not the best person when trying to explain things so hopefully I didn't confuse you too much.:)
 
the site i looked at about the tikka t3 showed its msrp at $800.

Thanks for all the info, always a pleasure on this forum.
 
nicely stated, Simple man. To give you another idea, a 1/12 twist with a 223 cal rifle will let you shoot up to about 60, maybe 62 grain bullets. Anything heavier, and you may not hit the side of a barn. The 1/9 twist will get you up to about 70 or 72 grains, after that , your guess as to where the bullet is going.
 
With a 1/9, it depends on velocity and barrel length.

The greater the velocity, the more spin imparted on the bullet. In other words, the faster a given bullet travels through a segment of a given twist rate rifling - the more spin imparted on the bullet.

This is why most 24" 1/9 twist AR barrels will stabilize 75gr bullets. The 75gr bullet gets up to higher speeds WHILE being pushed through the 1/9 rifling. 16" barrels are 50/50 chance or less. But, that's just a rough comparison because the 75gr bullets I'm talking about are made to fit the magazine. Some long range bullets are longer than the 75 Hornady for example...and thus harder to stabilize. These are not meant to be able to assemble a cartridge that works in an AR magazine. So bullets that can be used in bolt-action rifles can be much longer than bullets used in semi-auto loads.

Most bolt actions have 20" or longer barrels in .223. If you have a 22 or 24" 1/9 I'd try the heavies and see if they keyhole or not. I suspect they should work great. Even at SAAMI pressures...it should be enough velocity to stabilize a 75gr with a 1/9 with that barrel length. There's also the inconsistency. One barrel from the same manufacturer can fall on the fast side of 9, whereas another might fall on the slow slide of 9" twist. All depends.
 
The problem with lightweight varmint bullets in a fast twist barrel (1 in 9) is due to the high velocity the centrifical forces can literally tear the bullet apart after it leaves the muzzle.
 
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