i've talked and heard from 3 individuals that have shot and watched others take anywhere from between 20 to 50+ animals each with the 300 SMK. Darryl Cassel was the only one that never saw the bullet fail, or not open up. in all cases he said the terminal damage was extensive to, extreme and in some cases, volley ball size holes. the other 2 said they've seen a few cases where the bullet went right through a deer's ribs and not even make the deer stumble. when they work, they work great. but once in a while,they don't open. i opened the hollow point up on mine this year to guarantee expansion. of course these were the 250 gr version. personally i can't wait for the Berger's to become available. i will use them if the accuracy is as good.