The Universal tools use square trays.
I have two of those...one for small one for larger.
I dont really like the trays....the little cut off slider moves too freely.
I bought an RCBS tool that uses shell holders for some 45 colt brass. It came with the round tray.
The Hornaday 45 colt brass has nearly no rim....and did work well with the Universal tools.
I made two switches.....Starline 45 colt has a larger rim....and I just prime the Hornaday brass on my press.
