.308 175gr SMK C.O.L
In sierras manual it list the col at 2.800. I decided to make my own overall length gauge by using my lee neck sizing die to neck size the case so it is just barely tight enough to hold the bullet. So i inserted a bullet into the case and placed it in my rifle i closed the bolt fully and carefully opened it open and pulled the case, this should have forced the bullet into the lands giving me my max over all length correct? When i took a measurement it gave me 2.880, does this seem long to anyone else? 8 hundreths longer than the books max c.o.l??? Im kinda new to this whole thing and im just looking for some for experienced reloaders advice, to see if this is correct or not.
thanks in advance