I have used the 300, 350, and 400gr versions in my old Knight USAK and they shoot like there is no tomorrow. I've shot dime-size groups at 70 meters with the 300s and nickle-sized groups with the 350s. And their performance on game has been spectacular for me. Shot a wild boar right through the shoulder with the 350gr version with 90gr of 777 powder - bullet didn't exit, but it mushroomed classically and was expanded to a full 1 inch wide inside the body cavity...................massive internal damage and porky dropped in his tracks.
I really recommend these heavier bullets over the lighter versions - unless you really reduce your powder load, otherwise they can be overdriven to really bad accuracy.