What ammo for CZ457 precision shooting

grauhanen said:
If the ammo shoots well when it's a bit cooler in the spring or fall, going supersonic or faster than the speed of sound in the summer isn't a problem.

Keep in mind that it's when a projectile slows down into the transonic zone (which itself is about 890 to 1340 fps) that it may experience accuracy-robbing transonic turbulence. Since your .22LR round spends almost all it's useful flight time within the transonic zone of speeds, it won't experience transonic turbulence.
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Whoops, posted with the wrong account initially; ignore the MDT post.

What Im currently experiencing is interesting flyers I typically don't get on my 457 in colder weather, and my ES has changed as well. Switching to my 10/22, which runs way slower, has solved the issue and it just hammers. My current theory is Im just breaking into super sonic and then hit the transonic range within 50 yards, Either way, Im still happy with the gun, but the slower barrel on my 10/22 seems to be quite good with the SK LRM.
 
Two different rifles may shoot the same ammo differently so it's possible that one simply shoots a certain lot of ammo better than another.

With regard to potential supersonic flight causing poor performance, it's a non-issue here.

While warmer temps typically increases .22LR MV, that ammo will produce the same kind of accuracy performance regardless whether it goes a bit faster than 1125 fps (the approximate speed of sound) or slower. Bullet flight instability asscociated with transonic turbulence requires bullets to slow down into the transonic zone velocities which are about 890 - 1340 fps.

In other words, the bullets must be faster than 1340 fps to have the potential to experience accuracy degrading transonic turbulence as they slow down. (And not all projectiles are equally susceptible to transonic turbulence.)

Unless it's hyper velocity ammo such as CCI Velocitor (MV of 1430 fps), all other high velocity and standard velocity ammo never exceed transonic zone speeds. They aren't inaccurate because of their MV. When they are not accurate it's for other reasons.
 
For the price I’ve been quite surprised by Norma Match ammunition as it performed as well as some SK rifle I had. Obviously that’s in my rifle (a Tikka T1X) so YMMV.
 
Sk high Velocity has showed the better groups for me, however, I had some Eley Club with similar results, each rifle is different so it is a trial an error for each person
 
Learn the rifle first with good but not too expensive ammo. CCI STD and Norma TAC22 have been shooting very well for me. Buy a brick of each, and shoot until you can shoot consistently well enough that you know you have reached the limit of the ammo. At that point you are ready to start testing more premium ammos.

I'm shooting a 455 with a 20" tapered lighter barrel in a chassis. I am now at a point where I can consistently meet the CGN 100 yard challenge with both these reasonably priced ammos.

Interestingly, yesterday I shot three targets, two with tac 22 one with Norma Jakt Match (about 2 x the cost), I shot better with the TAC 22.

Again, practice until you are not the limiting factor with good, reasonably priced, ammo; then start testing expensive stuff, otherwise you will have good and bad range sessions and will waste a lot of money; maybe even missing one that the rifle loves.
 
Almost 80% to 90% my local PRS cz457 shooter use sk long range match in competition and half them use norma tec22 half use cci sv as practice whatever barrel they use.
I personally have tested the factory 20"pencel barrel, the 20"varmint barrel and 20" match chamber factory barrel. They all like SLK LRM and consistently produce sub moa at 100 yards. I also stock up norma tec22 for practice.
 
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