My Ruger 77 shoots coreloks (and most anything else) well inside of an inch at 100 yards. And they've killed everything I've shot with them. None have gone over 10 yards. Lot doesn't matter either. They always work fine.
Here are two targets, both 3 shot groups using factory coreloks in my Ruger 77 Mk II all-weather .300 Win Mag. The difference in groups was in regard to how I was shooting that day.