Originally Posted by Edd
I'd use the .062 for small primers and the .075 for large ones.
Thats about the jist of it. The difference is only in the pins tip(last .300-.400")
The small primers help keep case head expansion minimized, thus guys will run those cartridges hotter (examples 6br, 6.5x47 lapua) The large fire pin tips will pierce the small primers or show cratering faster than a small FP tip. This has more to do with cup displacement, the small tip displaces less, thus it thins less.
so if your planning on a hot 6.5x47L get a small pin.
If your doing a 260 rem, the large is fine.