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Plenty of guys on here casting them.

correct.....more of a shockwave going outwards,round or pointy can poke through easier....is the theory.
as said earlier,its like an apple corer has poked through stuff..a big empty hole with...

I don't think it's going to matter too much what you use.they bore a pretty big hole and let lots of daylight in and red stuff out. The above bullet failure came out of dead animal..... Bullet didn't...