I have been having a Devil of a time getting the desired bullet to load for my C-Sharps .38/55. The manufacturers are not producing much of a choice lately. I am looking for a cast bullet about 255 Gr. 377 dia. that does NOT take a gas check. At this time the only ones I can find are .379 dia. or larger. I have ordered some .379's but I do not know how much different they will shoot than the .377 dia. The bore slugged .375 & .376 which is what Sharps told me my gun was. What effect will the different diameter bullets have on accuracy, I am shooting competition.