So my friend said I could shoot at his house but I want to make sure it's going to be ok and safe. We would be shooting 22/22LR, and .45. There is a BIIIIIIIIIGGGG long field. Not sure how big is big enough though. It is also semi near a highway. We would be shooting paralel obviously, but I didn't know if there was some stupid law about discharging firearms too near the highway. Also what makes a cheap, effective backstop for shooting? Thanks.