My wifes BLR in 308, requires small base dies. More than that, it's so damned tight, it requires me to small base size, then either size it again, or run the case through the RCBS file trim die for another sizing.
Yes, it's been to the gunsmith, tight chamber was the pronouncement.
Some overseas factory rounds are a tight fit.
I know, not many BLR's are this tight, but you won't know 'till you try it whether yours is tight or not.