Building a private range out 1600ish or further if needed be ,but I dont think I need to use .5 thick AR500 past 1000. Can I use ar400 or thinner ar500? Im wanting to go cheaper because I want some 16, 18, and 20 inch circles made. Only using 7mag and 6.5Creed but will probably use 338LM and 50BMG at some point.