Nice day. Wind 1-5 @ 7 o'clock.
Cz 452 olh with 10x scope.
Fed 510, Aquila hv and Aquila sv
The scope was adjusted 15 mils up from a 50 yard zero.
Using a 3 mil holdover 9 shot grouped 13 inches.
Using a 4 mil holdover and Aquila hv it put 7 shots into 14". 1 went 1 1/2 ' higher then rest while a couple went off bottom of the target which was about 2 inches lower than the group.
The target was about 4' tall. I usually have to go up 3 mils to hit at 200 so I held over 4,5,6 and 7 mils high. About 6 shots and never hit it. Probably went low.
Pretty cool that you can shoot that far. I've been shooting out to 350 yards. I've needed to add 15 to 17 MIL total up from a 50 yard zero using std velocity ammo. My calculations indicate I would need 20 MIL or more at around 400 yards with my gun and ammo.
Do you have a chronograph to see what velocity your ammo is doing and then go to one of the online charts to get a better idea?
Good luck. It's a lot of fun when you start connecting regularly.
No chrono. They say rimfire ammo is inconsistent especially with cheaper brands. Federal 510 has always worked great in the cz. I try not to get that technical with rimfire as it would take the fun out of it.
I've been shooting out to 350 yards. I've needed to add 15 to 17 MIL total up from a 50 yard zero using std velocity ammo. My calculations indicate I would need 20 MIL or more at around 400 yards with my gun and ammo. 
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