I have experience with both the CZ 455 Evolution and the CZ 455 Varmint. My Neighbor just purchased his Evolution about a month ago. I received my Varmint 3 weeks ago. I have attached a new Leupold 4.5-20X40MM 1" Tube - Which is a great scope for @ $550.00.
But the Rifle is the topic. Between my Neighbor and I, he has used one box of Winchester described below, and I have tried 2 different Ammo's 1 Winchester 40Gr Copper Plated Dynapoint GT w/VG Results and groups to the Junk of the CCI Mini Mag. (30Gr ?) The CCI Mini Mag is Absolute Junk in my opinion. Using a Caliper and Micrometer, I measured 5 bullets out of a box of 100. The bullets wobble when rolled and vary by 10 - 15 thousands in length and width amongst just 5 bullets. But Run a few Patches down the barrel, put them in and you get descent not excellent Groups of 5.
At 50 Yards, you can get V/G repeatable groups using the CZ. You put it in and once the barrel is warm, she shoots very well with some inexpensive Ammo. The best Group at 50yds was 3 shots in a 3/8" group using one of the Winchesters (It came in a box of 333) Cannot remember the exact name, but a Silver box w/333 bullets made by Winchester. It is the only Ammo he has used in it from day one. But there are only a few left - next time we are planning on spending some cash for HIGH Grade 22lr ammo. We both LOVE our rifles, Fun, Accurate to the T, and inexpensive.
When shooting my 15lb Bench .223 1:7 twist Heavy Palma Shilen Barrel w/6 rifling's - Select Match Grade and Heavy layered walnut custom stock wrapped around a Remington 700 CDL Left Handed Action, the ONLY Ammo I will shoot thru it is Black Hills Match Grade 77Gr Ammo. By far the best for the rifle and TOP of the LINE ammo. Groups at 100-150yds as small as 1/2moa or better with the best with 5 shot group in 2 connecting holes.
This CZ at 50yds is capable of that and better once we find the right Ammo. One guy at the range put his old CZ 22lr (452?) and put 3 shots in the same hole, with a revolving back sheet to prove all three were fired. Repeating this would be very difficult, however I would recommend (And Have) to any one who will Listen. There are some downsides, but this sturdy little rifle with some TLC is the Best Kept Secret I know of.
Too anyone looking for a 22LR in the 400-500 range, I would chose these rifles over any others. The bore is so tight, I had to reduce the diameter of the .22 expanding rod for my Bushnell $60.00 bore site.
I have heard various conversations on cleaning the rifle, from Dry patches only, to Soaked Nylon Brush to whatever. If anyone has experience with a proven Cleaning Method. let me know. I have heard the barrel is to soft to use Copper Solvent, and just the opposite.