So i recently just got into hunting because of a buddy of mine. So in picked up a .243 and bought a box of 100gr and plan on sighting it for 200. I also plan on hunting coyotes which I'll end up using 65gr to save the pelts. How does the gr change affect the sighting if I've sighted it with 100gr at 200. I'm relatively new to this so I want to make sure when I shoot I dont end up whiffing my shots. Thanks for the help.