LAST EDITED ON Mar-23-15 AT 11:17PM (MST)[p]Rcbs dies I do not think they are compressed maybe they are ? 168 vld Berger 80 gr retumb it's happen like two or three times now only with the Berger in a 7 mm stw
How much did it grow. If only a few thousand you could have a set of calipers that are off. Also calipers are not that accurate with most users. This is due to not using the same amount of pressure applied to the wheel when measuring. As stated above, if it is a compressed load, that could be your problem.
How did you measure the loaded round, from bullet tip to the case head? Many bullets vary in length if you measure from the tip. When measuring for length, you should use a bullet comparator that measures from the side or ogive of the bullet for a more consistent way to measure. ce61