Tried several ammos at 50yds yesterday. Rifle: Ruger Precision Rimfire .22lr, Vortex Diamondback 4-12x24, UTG medium rings, Harris bipod. CCI Standard, CCI MiniMag, Federal Match, Eley Club, & Eley Target. Zeroed with CCI Standard. Eley Club gave the best grouping. Had Extraction issues with the Federal Match. MiniMag was the worst grouping. Like to make a note that the bench top had a soft/mushy surface. You could literally push the “mat” up & down.