I have quite a few 55 grain bullets. I know I could try them and see if they shoot accurately.
It depends upon what you mean by "best". There's no reason the 55 grainers won't shoot just fine from an 8 twist, I've shot a gazillion 55 grainers out of my two 8 twist 22-250's. The heavier bullets will buck the wind better and give better long range performance but there's no reason to think they'll shoot any more accurately than the 55's. Overstabilization is a myth.
