Best 6.5 CM for whitetail

[Blacklab1]

I put a 6.5 together for deer season this year but I'm not overly familiar with the caliber and was wondering what factory ammo everyone is using for whitetail. It's zeroed with Winchester 125gr whitetail that does shoot sub MOA @ 100 yards but it seems to me that a heavier bullet may be better. The farthest I'll be shooting is 400 yards on my Kansas trip. I'd rather not get into hand loads in case my luggage gets sent to Florida while I get sent to Kansas.

 

[cajun]

The precision hunter 143 eldx or 140 eld match.