My 550B has performed flawlessly reloading .45, and I'm finding out the hard way that reloading .223 is a different challenge.
I have 2 toolheads setup. In the brass prep toolhead, I have a Lee Universal decapping die in station #1 and the RT1200 in station #3. The Lee decapping die has a square shoulder where the pin transitions to the shaft, and apparently, the die is not concentric to the case, and causes the shoulder to hit the edge of the case occasionally. At this point, I have to poke the case to get past this blockage.
On the 2nd toolhead, I have a set of Dillon dies, and must say that the decapping pin is much better designed, in that there is no square shoulder but rather a nice taper in the transition area. So, even with die/case misalignment, the case is gently guided to the opening of the die, tilted and "funneled" in. Now,even though the press is not getting stopped from the case hitting the pin, I'm still concerned about this misalignment (see attached photo).
The shellplate has been correctly tightened, the cartridge spring is not touching the case, the toolhead is snug. What am I missing?