Nice. Yeah I'm making these for my 86 year old grandfather. He should enjoy these much more than the HXP or PPU Garand ammo.
This has me wondering if there is reduced load data for 7.5x55 swiss. That would be fun in the K31.
If you want to get into reduced loads try H4895 .
Also trail boss is silly light and is very bulky and you can fill the case to the bottom of the bullet with out fear of over charging.