My original RCBS 45 ACP/AR die set is dated "1980". It has a tungsten-carbide sizing die that is WAY too small for sizing 45 ACP or 45 AR brass (.467" finished dia.), an expander die with spud way too small (.4475") for .452" cast bullets, so both of those are basically useless and have been set aside. The OEM seating die, though, is an interesting critter--it has a vestigial roll-crimping shoulder that sorta can set a small roll crimp, but really is at its best just removing the case mouth flare from 45 ACP reloads as it seats the bullet.
This die's current sole purpose is to seat the bullet--it remains uninvolved in the act of "crimping". A fourth die joins the party now--a taper-crimp die to turn in the case mouth flare ONLY (that is ENOUGH) on 45 ACP loads, and the 45 AR seat die for roll-crimping 45 AR loads.
45 ACP and AR cases get sized in an RCBS T/C 45 Colt die (a fat .469" results) and expanded in a Lyman Multi-Charge Die spud #45AP that is .450" x .454" in M-die form. My 9mm, 45 Colt, and 44 Magnum brass gets sized in steel dies since about 2012, and the RCBS 9mm and 44 Mag T/C sizers have been on extended lay-off. RCBS T/C sizer dies are a great idea poorly-executed. RCBS CAN do it right, my 38/357 T/C sizer gives .379" finished diameter; they just DON'T.
The micrometer--the handloader's OTHER polygraph.