I use a 243 wssm in a browning a bolt v. stalker topped with a leupold 8.5 x 25 50 mm . i load it with a 60 gr. sierra varmiter bullet 50.0 gr h 414 also a 80 gr. berger bullet .with 48.0 gr. h 414 . my best group with the eighty has been five in. at 600 yds.