Need to build a solid backstop/bullet deflector for my rifle range. Bullets are doing damage to pine trees on neighbors property and it will be safer if I build one. Dirt burms are not an option.

Probably going to be an angle iron frame on wheels with a plate steel deflector about 24-30" wide and 48-60" tall and angled at 45 degrees to deflect the bullets into the ground and keep them on my property.

So, here's the question. At a distance of 100 yards and out, what thickness of everyday run of the mill plate steel do you think I will need in order for hot 243's and 270 wsm's with soft points not to punch through. I'd imagine 1/2" or better.

Anyone on here shoot at ranges that might have some insight?

Thanks in advance for any good input or ideas.

SC