I don't believe you'll find a .363 jacketed bullet for your 38/200. Most of the people I know are using unsized bullets from Lymans 358430 mould, which is actually a roundnose bullet, originally designed for 35 Remington rifles. There are also custom moulds available that closely match the profile of the original 380/200 military bullet. However, you would still need to cast the bullets yourself. Some early Ideal moulds are of sufficient diameter too, like 360271, but it's only about 150 gr. I've also seen Lyman 358311s that cast around 360-361. Trying to size down a 40 cal bullet to .363 is going to frustrate you beyond belief.