From the cartridges that you have listed, I'm guessing that you have a contender, so my suggestions are based on that. For standard chamberings, my first choice will always be 7-30 Waters. It is a great round and out of a pistol will take you to 200 yards. 2nd, 30-30 if you are handloading and put light spirepoint bullets in it. As for wildcats, there are a ton of great long range rounds such as the JDJ family as well as the ones just about every other custom shop offers. The 309 JDJ is an excellent round that I have only shot and not loaded for, but I've heard that forming the shoulders can be a bit tricky.