It occurs to me that penetration testing is one area where John's idea of replacing the polymer tip of his ideal monolithic bullet with a long-shanked, steel tip would be a viable option.
Since this would be just for evaluating barrier defeat, it seems like it should be okay to also use lead-core bullets like the Hornady 123gr AMAX (or maybe even the Wolf 100gr FMJ?), for instance.
Photo below gives an idea of how long the shank of the metal tip should be relative to bullet length.
![[Image: 17cross.jpg]](http://www.varmintal.com/17cross.jpg)
Since this would be just for evaluating barrier defeat, it seems like it should be okay to also use lead-core bullets like the Hornady 123gr AMAX (or maybe even the Wolf 100gr FMJ?), for instance.
Photo below gives an idea of how long the shank of the metal tip should be relative to bullet length.