CZ 527 Velocity

[joea]

I read an early review of the CZ527 in .204...the tests indicated that it was shooting factory ammo below the indicated velocity figures. Is this what you CZ owners have found as well?

http://www.shootingtimes.co.uk/guns/rif ... eview.html

[jo191145]

Welcome to the forum joea.

I do not own a CZ but its pretty much accepted fact that most factory ammo is over stating the velocity figures.
Hornady started the 204 with claims of 4225fps with thier 32 grainers. Last time I ran some over the chrono I was getting roughly 4150fps.
Don't sweat the speed, accuracy kills.

[joea]

Thanks for the welcome, I have been lurking for awhile. The numbers reported in the review of the CZ seem significantly lower than numbers reported for the same ammunition in the Ruger and Savage rifles.

[Sub-caliber]

Barrel length will effect velocity. Factory ammo is generally tested with a 24 inch barrel. A longer barrel will generally increase velocity while a shorter barrel will generally reduce velocity readings. The oppopsite is often true regarding accuracy - a shorter barrel is generally more accurate while increased barrel length can often diminish accuracy.

[WrzWaldo]

Barrel length will effect velocity. Factory ammo is generally tested with a 24 inch barrel. A longer barrel will generally increase velocity while a shorter barrel will generally reduce velocity readings. The oppopsite is often true regarding accuracy - a shorter barrel is generally more accurate while increased barrel length can often diminish accuracy.

Is that why the 1K shooters I know are using 26" to 30" barrels?

[Ray P]

10-4 on the barrel length for 1K. Two reasons for that velocity and being able to use a slower powder to get a better case fill. All my long range rifles are wearing 30" tubes.
Later and just my .02
Ray P

[glenn asher]

My 22" CZ barrel is considerably slower than my 26" Savage barrel, that's to be expected, of course, but not quite as much as I'm seeing (250fps, give or take a bit). Still, the CZ shoots fast enough to kill things, which is why I have it, it's a lot lighter weight for carrying around, so the Savage sits at home when I'm out walking around. Accuracy kills, speed just makes it easier to hit WAY out there,.... maybe...............

[Steve V]

The one box of factory ammo(Hornady 32 gr) that I have shot in my Cz Varminter was well below factory velocity claims(3825fps), but I don't blame the barrel, as I have no problem with getting excellent speed and accuracy from handloads.And altho a bit slow, factory ammo was very accurate. With most handloads that I have chrono'd, the CZ is right at or a bit faster than what the data says it should be. I have one 32 gr load that clocks at just under 4300fps and a 39 gr load that clocks right at 3900 fps.

[joea]

Steve V...what size groups do you get?

[Steve V]

This is a pretty good representation of how the gun and I shoot on a good day, altho the load using 2460 powder usually groups a bit tighter. The 40 gr V Max and Ballistic Tip groups are very typical of how my gun shoots these bullets. Factory Hornady 32 grain loads grouped similar to the H4895 load.

[K_Hini]

how is IMR 4895 in the temp sensative category compared to H4895??

thanks
kyle

[Steve V]

IMR 4895 has been a staple in my powder inventory ever since I started loading 36 years ago. I've never had it be "temperature sensitive"; that is , it seems to shoot same point of impact despite what time of year it is and once I have a load figured out in the spring, summer temps cause no spike in pressure.. But I have never drug the chronograph out in 20 degree weather to check out muzzle velocity, either.