Actually bullet construction is far more important than bullet shape.Accubonds,interbonds,scirroccos and jensens are all boattails that will hold together as well or better than most flat based bullets.I used a jensen j26 to take a grizzly and the bullet entered at the throat and stopped at the rear hip after travelling the length of the bear.It would be hard to find any flat based bullet that would do a better job.I have also taken two moose and four elk with boattailed bullets out of my 300ultramag and all performed very well.