RE: most accurate 22lr ammunition
I had had good luck with federal gold medal match (not sure if it is called that now but it is the most expensive .22 ammo federal makes.) It was accurate and decent for small game. Seems like it was 20 bucks a box.
For target, try ELY tennex. It is what the olympians use and is stupidly expensive.
Also have read good things about the premium wolf match .22
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