Well, I had to reinforce my trap.
The trap made of, on hand surplus that I had laying around or have access to at no cost, 55 gal delrin drums and cat litter. I originally wanted sand but at $175 a truck load against free cat litter, cat litter, won. First I cut the top off and sifted the litter in through a screen to remove all undesirables, then screwed on a new top. The drums really do a good job of sealing back up a preventing the litter from leaking out.
Now, my only and new problem is, punching through with loads that are moving over 1800-2000 fps and with the heavier boolits. I can't remember the last time I shot a jacketed load but getting some new slow twist 30 cal barrels every shot so far has punched through, so know I'm doubling up on my stop. I hate to waste perfectly good lead. I've not reclaimed any of the lead yet, but have looked at the lead inside and won't regret making these.
I staple my targets directly to it and turn it periodically. I've got to paint them again that white sticks out like a sore thumb.