Rimfire is the cheapest trigger time in shooting, and this shelf keeps it stocked: .22 LR by the box and the 500-round brick, .22 WMR and .17 HMR for small game and varmints, from CCI, Federal and Winchester.
Every serious shooter should burn more rimfire - the fundamentals transfer straight up to centerfire at a tenth of the cost. Feed a 10/22, a rimfire trainer or a kit gun from here and save the expensive stuff for what matters.