Ive had my FMJ's for about a little over a month now and i love em. Im shootin the 340s which are a little on the heavy side at 11.1 gpi but the penetration im gettin with them is insane. I arrowed a doe on the evening of opening day of Ohio archery season and got a clean pass through at 30 yards no problem. I also bought a half dozen but after 2 weeks I was quick to go get another dozen and they've been flawless so far for me so I would definately recommend another dozen...Hope this helped...