I have hunted whitetails with a .243 for several years and tried several different loads, including the remington core lokt you mentioned. my favorite by far are hornady custom boattail softpoints in 100 grain. ialso thinkthe remington is a good cartridge, but the hornadys outperform them by far, and give you about the tightest groups you can expect from an over-the-counter factory load. the only other bullet i have found that can touch the hornady brand are federal premium 100 grain softpoints. hope this helps in your decision. good luck