Hey i use the rocket hammerheads, they are 2" cutting diameter. I havent lost a deer i shot with them yet. They make such a huge hole tho its sweet. Even if ur not gettin a perfect double lung shot , u will still get the deer most likely . My dad even got one this past year when he shot it in the A$$. The buck turned jsut as he let go , and it smacked him in the right butt cheek , and went up through the gut, and somehow hit the liver. But i shoot 58 lbs and they work perfect even with that low poundage. I like them.