For a box of 50 22LR ammo it can cost any where from about $5 to $38 or so. Bulk ammo may be a touch less than 10c per round.
My Lithgow is good with almost everything but i mainly use CCI because it's really accurate, cheap and readily available.
CCI std is $6 per box and does consistent 10mm groups at 50m. I tried Eley match ($22) and it was no better. Lapua centre X is reported to shoot really well in the cross over.
CCI quiet ($8) is rubbish but CCI quiet segmented is great ($14). Useful out to about 40m or so.
Eley Sub HP is my main hunting round at $12... seemed to hit harder than the RWS Sub HP and was giving 10mm groups.
I haven't tried HV yet and may not now I have a 243