I have my bullet for my .72-caliber muzzleloading rifles. That's good.
I bought a couple of hundred pounds of certified 30:1 alloy. That's good, too.
After several range sessions I realized shooting 775-grain bullets will run me through my casting metal in a very short time. That's bad.
Using different alloy - that is, harder or dropping different weight/diameter or "range" lead - is unacceptable.
If I can reclaim most of my bullet metal from the range, I'll save a fortune. Even though the range is ten minutes from my home, any bullet stop or trap need be reasonably portable. The only simple, inexpensive??? device I can think of would be a large (what material at what cost??) plate that would lean on a pair of poles or posts that are anchored shallowly into the ground. Bullet impact would cause spent bullet to drop or burrow into the ground in front of the angled plate.
Not only have I no idea whether such a device would do the job, I have no facilities to build it. And I have no idea what such a device might cost or weigh.
Clearly, I need assistance. Help.