Shoot, if anyone wants me to test any I’m fine with it. Lol. But the mixture is super easy. I use Knox unflavored gelatin. You can shoot it, melt it down, strain it, and recast it. They last quite a while until they start going bad and need trashed. With two large 14.5 long blocks I have been able to capture every non FMJ/cast/plated projectile up to 375HH and 4570. If I had to do it over again, I’d get bigger Rubbermaid tubs to have longer blocks. A few of my Projos have been laying on the table just behind the block after exiting and bouncing into the backstop and bouncing back.