I don't know if I'm posting this in the right place or not, but please move it if not. I shot some of my reloads yesterday in an attempt to recover the bullets, and measure them for expansion, and penetration. I used two 3" think phone books soaked in water, backed by 3 layers of soaked OSB. I was shooting .44 spcl loads with 240gr RFN lead bullets. My problem is that this back stop did not stop the bullets. They all went thru everything, and were lost. I don't really want to go to the expense of Ballistic Gelatin. So do any of you have any recomendations? I have been saving milk jugs for some of these tests, but am now not sure how well they will work. I need something that I don't have to buy every time I shoot them.