Myself, I perfer a flat based bullet, it seems to me in my experences anyway, that a boattail bullet tends to shed its jacket more frequently than a flat based bullet. Both are good however, I like Seirra Pro-Hunters, they are a flat based bullet that is extremely accurate, I use them in my 280 and my 30-06's, perfect mushrooms everytime. I cant find them for my 338, I use Seirra gamekings in it, they have worked fine so far, just wish they had some Pro-Hunters for it.