Re: Metal Gongs
1/2" steel stops MOST of my bullets from the 300 RUM at 300 yards. I would say that 1/2" steel from the 300WSM at the same distance would suffice.
I only have had one load with enough energy and velocity to punch through. All others stop just fine.
+1 on the 100 yard gong is a bad idea.
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.