I'm looking to pick up some steel targets from JCsteel.com and was curious at what sizes you guys would recommend. 100, 300, and 500 yards. Most of my friends are hunters, and don't do a lot of precision shooting. I'm thinking a 3 or 4" for 100 yds, 6" for 300 yards, and maybe 10-12" at 500 yards? I'm all ears.