I have a Lee Loader that I want to use to load for my 6.5x55. The general consensus seems to be to use a factory round to set the seating die and take it from there. However...
The minimum OAL for a 140gn bullet is given by Lee as c. 77mm. But the Federal 140s that function very well in my T3 are only a shade over 74mm.
I worry that if I load the Nosler Partitions I've bought (32.7mm long) to replicate the Power-Shok OAL, I'll be seating them too deep (c. 14mm). In fact, even Lee's measurement seats them c. 11mm deep – which is already past the shoulder.