215grs is what I recommend to anyone that's just starting out, it's a mild load and doesn't beat you up or the brass.
It works for most powders and all bullets, from ball to AMAX but on some newer pull down powder you need to be careful. There's been a couple guys here that reported that 215grs was showing signs of over pressure.
For the AR-50 and AMAX I use 222grs and load them to 5.71" OAL. Talking to another board member he said he got up to 240grs with H50, no pressure signs and had good accuracy. You just need to keep an eye on anything that shows signs of over pressure. If you start to notice any, STOP and back down.
I got some really good results with Vhitavoury powder but I don't shoot matches so the cost really isn't worth it to me to use it full time.
If you shoot alot of tracers, 5010 is the best choice for them. Or you can take and poke a small hole in the tin foil cover on the base of the projo. Only do this to the ones that you plan on using at the shoot you're going to. Tracer elements are hygroscopic, attracts moisture and when they swell cause the necks to split. By poking a hole it will ensure that the tracer will light all the time.
Be safe!