My original thought was to stick the thing into the ground. Would this not work?
By attaching the frame to the stand are you saying that the stand should be larger and the frame fit
into the stand? We use square tubing, I just wonder how much can be written off as "Scrap"
I've looked at these items below on the web, but due to their relative low price I'm not sure how long they will last. Also, I have looked at similar polymer targets where the bullet simply passes through. They are supposed to withstand thousands of hits but not pose any danger of ricochet. Are you familiar with these?
Polymer target with what appear to be flimsy legs: