Yes, it has a slight taper. Base dimension just ahead of the belt is .513 dia and dimension across the shoulder is .502 dia. That works out to about a .011 difference, or a .005 taper. That's why it has a volume thats only .8g less than a 7mm STW and a 12.6g more than a 7mm Rem Mag.

You never pay too much for something, you only buy it too early.