I've used Triton Frangibles before... they don't expand... they are like ball ammo when they hit soft flesh but will come apart if they hit anything hard... now there are other types of "frangible" that are realy just pre stressed bullets that come apart into several pieces when they enter flesh... I've used those too.. in .22lr, they work great... that's the experience I have with them.

I have shot a few Glaser Blues. 9mm consistently fragmented and blew waterfilled milk jugs all to pieces. .38 Specials sometimes did and sometimes didn't. When they didn't fragment they were unimpressive.

I passed on your comments.