Originally Posted by John_Deer
I would wait until the 5.7x28 is established as a pistol round. Everyone wants a 5.7 until they find out they can't get ammo that will penetrate a bullet proof vest. Most people want a real varmint rifle in a varmint caliber. The 5.7 would be a fair varmint cartridge but pretty lame compared to more versatile caliber like a 243 or a 25/06.
most rifle cartridges will penetrate a bullet proof vest with out being armor piercing. and BTW armor piercing ammo in pistol calibers is illegal IIRC. so why would someone be looking for something they can't legally own anyways?
please refer to the ATF site, Title 18, USC, Chapter 44, Public Law 103-322.
it will explain the illegalities of armor piercing ammo in pistol calibers.