There may or may not be a problem with Doubletap and Buffalobore ammunition, but the greater concern is with those that "roll their own," and may or may not have the expertise of the above mentioned companies.
The larger ammunition manufacturers use special barrels that are mounted in fixtures and equiped to measue pressure from chamber to muzzle. They are also wise enough to know that the data obtained is relative to that barrel, and not necessarily all barrels. This beats by far the practice of some folks who determine such things by looking at a primer to see if it's flattened or not.
If all ammunition (handloads in particular) was loaded at safe levels the gunmakers repair departments wouldn't be discovering expanded chambers now and then.
The larger ammunition manufacturers use special barrels that are mounted in fixtures and equiped to measue pressure from chamber to muzzle. They are also wise enough to know that the data obtained is relative to that barrel, and not necessarily all barrels. This beats by far the practice of some folks who determine such things by looking at a primer to see if it's flattened or not.
If all ammunition (handloads in particular) was loaded at safe levels the gunmakers repair departments wouldn't be discovering expanded chambers now and then.