Take in to consideration the twist of the barrel you have, most 270's are made to shoot the lighter rounds, if you want heavier loads, they do make them, but I would just about guess that if you go over the 150 gr. you will be prone to get a key hole on your target and that would come frome too slow of twist. You have to have more twist/ft to stabalize the bullet. The 243 is a prime example, few will shoot the heavy rounds.
