RE: 38/55 caliber?
ktscontender we have a 38-55 in a NEF rifle and they are all bored at .375 and NEF recommends you use a .381 bullet . The only 38-55 ammo on the market is loaded with a .375 bullet , shootable but not exactly anything great for accuracy . I don't know what your contender is bored at but I am very sure what NEF and Marlin bores at