+1 to getting a reloading book.
Your favorite powder, reloading tools or bullet company will have a book. I think Redding offer ABC of Reloading or something. I have a Lyman, Lee, and Nosler book, as well as all the free handouts I can a hold of.
I like Benchmark, AA2230 for 50gr bullets in .223. I would also try H322, or W748. All of these are easy to measure in powder dropper.
Although I stuffed some Varget and R15 in a case and the 50gr V-Max did well, there is some effort involved stuffing enough powder in for the nice 3200-3400fps the 50gr is capable of doing in .223.