There is a huge list of good antelope cartridges but if one is headed to the gun store to specifically purchase a rifle solely for hunting antelope it should be chambered for the 6mm Creedmoor or you're doing antelope rifles wrong.
Now if sentiment or other nonlogical emotions are involved then all bets are off.
I say this having never killed an antelope with the 6mm CM but I have slayed a trailer truck or 2 and seen a lot more taken with the .243 Win/105gr VLD/3050fps.
Being able to buy decent factory ammo loaded with high BC bullets and factory rifles that shoot like customs is not a bad thing.
