I need to seek some opinion. I as going to use a martini cadet .310 action and put a barrel on it the only thing is I don't know what to chamber the barrel for. All I need is something that will string a line out to 250 or stretching to 300 yards. The only thing that I don't need is a big cartridge that sucks up a lot of powder, or something taht creates mondo pressure. I was thinking along the lines of a .218 mashburn bee. If I am on the wrong lines please let me know. Any comments will be helpful and noted. Thanks in advance guenther