Most guys I know that own double rifles own only big bores, or at least buy a big bore first. I did the same, and it's a mistake. The British had it right with their medium bores (those below .375 Flanged Magnum and 9.3X74R). Doubles in .400/.350, .350 No. 2, .400/.360 and .375 2 1/2" Flanged are extremely effective on ordinary game and more fun to hunt with than any other rifle I've ever used. They're superb brush and timber rifles for North America and are the finest boar and black bear rifles ever made. Old Elmer was extremely fond of a Lancaster .375 2 1/2", and he was right. The smaller bores like the .303 and .280 Flanged are fine for lighter game, and are fun to play with, but aren't as flexible.