I am reloading some of my 40 once fired brass and noticed something "unusual".
Dillon 550B, RCBS 40cal carbide dies. I screw the sizing/decapping die down till it touches the plate. Back it off 1/2 turn as per the 550 videos. When I size the 40, the bottom fraction is not getting sized 1/16-1/8 of an inch (i did the sharpie test). I know this as it will not drop smoothly into my gage. The brass drops perfectly into my Glock and Kimber 40 barrels. The test rounds go off without a hitch.
Move over to my old RCSB. same set up but only back off the die 1/4 turn. Same results on the sharpie test, barrel test and firing loaded rounds.
New factory ammo drops into the gauge with no issues.
ANY SUGGESTIONS short of investing in a roll sizer? I don't have this last 1/16" issue with my 308 or 223.