Yeah since I can't build full scale walls, and blast them with 2x4 studs from my air cannon or some other debris my regular cannon. 1'x1' squares 1.75'' thick and a 22mag will have to do.
A 50lb bag will make 2 of my samples with a little left over.
I have exactly one bag of 6,500 psi concrete so I hope that I can get 4 samples out of it, because the next nearest store that has it is 85 miles away.
22mag does a number on the store bought paver stones which are mostly sand and air. If the concrete samples turn out so hard 22 mag isn't doing much then I can step it up to 30 carbine. But I know 30 carbine will blast pavers to rubble with one shot, I'm assuming the pavers are almost as strong as concrete.
Yeah it's pretty easy to look up how thick of concrete to stop a certain round.
I checked on my high vacuum concrete today. The exposed sample does not look like regular concrete. It almost looks like grout. It's very smooth very few bubbles and all I did was slop it in the form just as I did with all the other samples.
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