Hello Reloading folks, Reloaded my first 20 rounds of .270 Win. yesterday. I have been reloading for my .38 special and .40 S&W for a while and this was my first attempt at bottle neck cases. The ojive on bullets and using that to determine OAL measurement is new to me. I understand that the purpose of a comperator is to measure OAL not from the bullet tip but instead from the ojive, which is a more precise way to measure OAL and determine bullet seating depth keeping the ojive a consistent .02 " away from the lands of the barrel. Is this correct? So if I used an OAL gauge in my particular .270 rifle and found the OAL is 3.802 (hornady comparator inculded in this measurement), will the OAL for any bullet I choose be 3.802 with the comparator?? I understand that depending on bullet the OAL from bullet tip to bottom of case will be different due to differnt types of bullet, but the OAL from the ojive should be consistent no matter what bullet I use??? Is this thinking correct? Or will I need to use an OAL gauge everytime I try a new bullet to determine proper seating depth? Thanks folks and I hope these questions make sense.