Hello all, I'm preparing for all of my reloading equipment to arrive so I can start reloading for my 7mm rem mag. I use this rifle for elk, deer, bear and cougar so would like some recommendations. I am still learning of course, but my understanding is only certain gunpowders can be used in conjunction with a 7mm rem mag (or is it the bullet that determines gunpowder type?)? I am starting all from scratch so need to order primers, gunpowder, bullets and brass. Is any primer suitable, or does the gunpowder type determine primer type? So, if in my position, which gunpowders, bullets, primers and brass should I order to start working up a good load? For example, if I have 3 different powders, do I keep the bullet and primer constant across the 3 different loads for initial testing (assuming I start at the lowest end of grainage for each powder)? How would you recommend going about working up a good hunting load capable of taking the intended game. Sorry for 3 million questions! Thanks!