I've been running 150 gr Remington Corelok for a couple years, worked well on antelope/deer. for the first time I will be carrying an elk tag.

My own shooting skills will keep me to 200 yards, maybe 300 on perfect conditions.

any recommendations for off the shelf to try? I am looking to change off the 150 core lok for 2 reasons:
1) A bit more weight for elk
2) Accuracy, may be me, but groups aren't what I'd expect

gun is a remington model 700