My plan is to start taking my AR-15, chambered in 5.56, to the range more frequently, especially after rediscovering how much fun it is to shoot. When I bought the rifle last year, I picked up some American Eagle 55 gr boat tail FMJ, which works, but then, I'm not an expert, either. What grain of ammo would you experienced long-gun types suggest, considering I have a 16 inch, 1:8 twist barrel, and I would like to be able to punch holes in paper and ring steel out to at least 100 yards (perhaps further since my club's range goes out to 200 yards). What are some good sources for purchasing in bulk?
I'm also thinking about an entry-level AR for my oldest grandson, and from what I can tell, most will have a barrel twist of 1:7. I think I would need a bullet that would work well in both rifles.
Thanks.