Part 2 of my polymags post , they may suck for trash pandas , but they are dynamite on pigeons. Out performing H&N crow mags both on accuracy and energy dump.
I have had great succes anywhere on the upper body and head. They dropped immediately. I am pushing them at 930 fps and have yet to have one exit the other side.
I have not experienced that issue with the polymags as if yet. They tend to stay in their head lol. As for the trash pandas I use the nsa 32 gr slug st 880 for and so far trash pandas zero, me 5.