I just got my Hornady OAL gauge in along with the cases for my calibers. Reading the directions on this It says to use with their bullet comparator. First off I really didn't want to spend the extra bucks for this and second do I really need it. Here is how I thought I could do this when I purchased the OAL gauge. I would use lets say a Hornady 55gr Vmax with the OAL gauge and once I determined my length I could load up a round in my 22-250 and back the length I got off the gauge back .20 or .30 By doing this I would be backing off the lands. Am I missing something here or will my method work? Rick