Semper Fi. Lots of old Marines on this forum. And lots of opinions, so I'm thinking that you'll get many responses. Because of that, I'll keep mine short.
I'd recommend the Lyman 49th manual. Over the years it's become my go-to info source for powder charges and bullets.
Varget will probably work just fine for you as a powder for both calibers, though I use different powders for both and Varget for neither.
Case dents, once you have reloaded and fired the case, will 'iron' out. Still, you can buy a bunch of once fired cases for not a whole lot of money.