I've been reloading for my 6.8 ARs. Max OAL for them is 2.3 in. because of the magazine size. I have been measuring OAL of the finished cartridges with a regular dial caliper. I notice differences with plastic tipped bullets.
The other reason OAL is important is to predict bullet jump. I understand that minimal bullet jump gives better accuracy, but have also read you can vary OAL to obtain the best accuracy for the round. Apparently, I should get an attachment for the caliper that seats onto the bullet to measure OAL.
What do you folks recommend for this?