No, make a dummy round with your specified OAL that you are using. I have a dummy round for all the different bullets that I am using for my 7mm rem mag and for my .223, since each bullet has its own unique design. For me it makes for quicker adjustments to my die for each bullet profile.
You make one using nothing but one of your cases and one of you bullets. No primer no powder. They help with quick adjustments when going from one bullet profile to the next in same caliber.