I have been hunting groundhogs some with the varmint grenades from my .222 and 223. The bullet shoots great on paper, but performs very poorly in the field. With Close shots 50-75 yards the bullet fragments and dosnt exit just like it should, but every single groundhog i have shot over 100 yards had a single hole in and single hole out. I had two misses with two ricochets, something you rarely hear a v-max do. I dont have a chrono, but with the 223 im loading 24.5 grains of h322 so that should push the bullet around 3500 fps or so. Could it be the bullet performes better at lower speed, maybe but i doubt it, If your getting great explosive performance from the hornet then maybe i got a bad box? I also tried them on some 20 oz water filled soda bottles at the range to see what was going on, at 200 yards it was as expected, single hole in single 22 sized hole coming out, At 100 yards my 17 hmr was tearing the bottles up greater than the varmint grenade.
^this big guy was only 75 yards, the blood you see is the exit, not to explosive.
^ this one was shot at close range,about 25 yards, the bullet entered the other side and with no exit just as it should.
^ This fatty was shot around 50 yards, not bad expansion
^ This one was shot at 50 yards with no exit, blood over the paw is where i hit it.
^ This one was shot with the 223 at 150 yards, it would have had to hit bone going through, lots of blood, but still a single hole in small single exit hole out.