Thank you, I've used the 154 interlock for years and like the performance but in the 20-22" barrelled 7-08's I use, the 154 is probably going around 2600 fps or so. Figure with the 139's, should be around 2750. With the 154's I've not had the fragmenting issue. Its a bullet I would also trust on most BG in North American at 7mm-08 speed, excluding the big bears