Not a .58, but I have a .62 w a 1 1/8 inch barrel, 1-48 rifling, I use 90gr of 3F GOEX. one hole group at 25, cloverleafs at 50, and a real good group at 75, all with the same point of aim, group opens up at 100, and LOW about 6inches. BUT where I hunt at 50yds will be a long shot. Oh, patch...