i have a pair of beretta o/u one in 3006 and the other in 9.3x74r with a set of 20 ga. barrels that snap onto either action. Love this setup. I can go just about anywhere and am set for just about anything. The 06 will hold within 1 1/4" at 100 yds with consecutive barrels, the 9.3 not quite as good but within 2". used this setup last trip to africa. got a 7'10" 200#+ leopard with the 06 and a 10'2" black maned lion with the 9.3, plus birds for the table.