I have been working on a Dutch Mannlicher for the past few months and since I am house bound to avoid the plague and waiting for the return of the stock from the checkerer thought I would work on making brass.
I know I am most likely preaching to the choir will post anyway.
I made a new stem for the 5C collet stop with a taper to center the cartridge and using a 7/16 collet can quickly load and shape the brass, turning the rim and putting a slight taper on the base this makes the cartridges slide much easier.
I have a RCBS form and trim die after forming and triming I anneal the neck prior to fire forming. Then resize check the lenght and reload with 6.5 x 54 die set. So far no split necks. I am using new Winchester brass.