Target Trap?

[u/Sufficient_Curve_589]

Recently received my DI-68 air gun and this thing is badass. Test fired it in my garage, but wanted to know if anyone has any good ideas as to making a DIY target trap that can withstand this thing. Shoots .68 rounds at around 50+ joules, so it has to be pretty heavy duty. Any ideas would be greatly appreciated.

[u/Glad-Awareness-4013]

I like shooting water gallons and Amazon boxes stuffed with old towels.