Hello, I am new to this. I have a Remington model 700 in 7mm RUM I took in on a trade. As I've seen the ammo is hard to come by, and barrel life is short. I want to convert it to something that's just all around more convenient. And in simple English as if you were explaining to someone who had no clue. I'm wondering what I would need to change, i.e. barrel, bolt, etc. as I've said I'm new to this and wanting to get into long range shooting. Just clueless here