I turned a adjustable brass shell trimmer on my metal lathe. It hold one of those snap off exacto knife blades. When chucked in a small drill it will trim hulls to 2 1/2 " perfectly. Couple seconds each and everyone exactly the right length. They do not need skiving I found out to crimp nicely. I use a Tyvek UltraThin Overshot shotcard (Ballistics Products) and adjust my crimp to fold a nice crimp. Most loads are nearly closed in the center but some loads would leave about a hole just large enough for most of the shot to run out into your pocket or shell bag. With this setup I can load 300-350 shells an hour on my Spolar. The thin Tyvek layer works perfectly and does not add too much thickness to get good crimps.
