6mm cm using 109 Berger.

If what I've seen from using a 243win is an indication, the 6creed might be just about perfect for Antelope. I plan on using a 108gr eldm this year. Guessing the berger would work well too.
 
What kind of max range are you expecting with say a 115 berger?

Well my load has MV of 3045 FPS. See the solution chart below at about 2500 elevation. For the appropriate game hunting application it would stay above 1800 FPS out to 900-950 yards based on this elevation. For target shooting it would be much more.

A1528E0F-98B3-4CA7-87FD-16C4C139955D.png
 
I ran the
101 Hammer Hunters and H4350 are your friend
I ran the HH 101's at 3201 FPS also but had better down range accuracy beyond 400 with all the Bergers. I have had issues with getting the BC solved on the 101HH at the longer range but it's a great bullet. I'll stick with the Bergers for now and they're half the price. Here's my 115 Berger load data with a 5 shot group.

image.jpg
 
I've shot about 3500 of the Berger 109HT bullets. G7 BC checks out between .302 and .306 depending on which rifle. I typically shoot them in the 2930fps range out of my 6mm BR AI (6BRA).
 
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