Quoted:
I have two different RCBS seater dies and wanted to know more about one that came with an older die set. The seater die came with a standard die set labeled Round nose 45 ACP. It has no taper crimp inside. The bore of the die is straight at the max diameter for a round. When seating a bullet, the round enters the die and it removes the bell in the case then seats the bullet. It works just fine for jacketed or plated bullets but sometimes shaves a slight amount of lead if seating lead bullets. Is this seating die intended for jacketed or plated bullets only? Does anyone have the RCBS paperwork for this type of seater die?
My guess,
You have #3 of a 4 die set.
#3 seats only, by changing the seating stem you can also load SWC's, which you don't have?
#4 die is the crimp die.
What I have done with my RCBS 357 and 45 ACP die sets is buy an extra seating die.
So one seating die always has the RN seater, the other the SWC seater. No changing seaters.
I also added a 4th die to crimp in a separate operation.
So what started as a 3 die carbide set became a 5 die lazy mans (never have to change the seating stem) set.
5 dies
just fit in the RCBS box.