Bullets

I was just curious to what bullets you like the most for accuracy, weight retention and what has the best "mushroom" I am asking this in regard to a .270 win and a 300 win mag but lets keep it broad maybe best for magnum and best for non mags.

I was looking a Barnes bullets because of there expansion but don’t know how the flat hollow tip will perform for accuracy, then I was contemplating the accubond which I am quite fond of due to the expansion and weight retention in combination with the ballistic tip...these bullets are quite a bit less expensive than Barnes too.

Any other suggestions or comments?

Thanks
Mike