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I've used CCI SV in all of my CZ's.
Varmint barrels, sporter barrels and my Lilja's.
I've had excellent results from a few boxes,
and absolutely sad results from other boxes.
Low cost means poor quality control.
Don't expect match results from what is meant to be 5 cent per round ammunition.
I have had the same results as above. It is quiet and fun to shoot, but trying to get really tight groups will just make you mad. It is great for letting friends shoot though. Most of my friends don't know the difference between 2moa at 100 and 1 moa at 100...much less 1/2 or less moa.
I have only tried a few different kinds of ammo, but have had descent results with FGMM believe it or not. I am shooting a lilja cut and threaded at 17" through a thunderbeast suppressor.
I'm the same, fun and quiet but groups not great. Just found target from new vpt 455 and the last 5 shot group from standards was over 1 in at 50yds. Love my vpt though, just don't have any real good ammo, if anyone could give up one box of match ammo I will pay or trade in whatever is fair.