I was talking to someone on the weekend regarding sizing and different calibers. Trying to explain caliber sizing to someone who knows little about firearms can be a bit of a challenge - mainly because it really isn't a standard convention anymore. I thought I would put together a short article on how, why and the differences in naming calibers.
Are you potentially chasing your own tail when it comes to neck concentricity?
The new generation of VLD (very low drag) projectiles have brought with them more accuracy, and more requirements to optimise. It won't be new to shooters that bullets have a sweet spot when it comes to seating depth. For a long time F-Class and BR shooters have been 'jamming the lands' - setting seating depth out long enough where the bearing surface is actually touching (or even slightly pushed into) the throat of the rifling. Minimising jump eeks out the final bit of performance.