I've been told that with the 9.5:1 ratio on my Stevens Model 200 .243, I need a heavier bullet to get the most accuracy. What is the most accurate ammo I can get off the shelf, and what is the most accurate you handloaders have found? I mostly hunt whitetails and the occasional coyote, both from 100-400 yards. I've had good luck with Remington 100gr core lokts. The largest I've found is the 115gr. Thanks for the help.