I get better groups out my B22 FV-SR when single loading. Even after polishing the underside of the bolt. I designed a single load tray and had it printed. Seems to work well in my rifle. If anyone is interested, the instructions and printable .stl files can be downloaded from DropBox https://www.dropbox.com/scl/fo/0lsag...nf4g7b7en&dl=0 NOTE: I make no claims for fitness of use. It works well for me as printed by the supplier listed in the instructions, but it may not work for everyone.