Opinion on bullet selection...

New to reloading my 6.5 creed. So far I have loaded 140 eldm, 140 smk, and 140 Berger hybrids. I have only powder charge tested at 100 with each. Group wise, the 140 SMKs just shoot the best. I know bergers are the bees knees. I'm not saying they didn't group well but the SMKs were just better. So, when it comes to taking these out to 600 plus, how much of a disadvantage will there be at that distance if I stick with the smk over the bergers? Or is this just something I'm going to have to try for myself? Obviously bergers have a better BC. Should I not be drawing any conclusions over 100 yard group size? Any input is greatly appreciated! Thanks!!