RCBS expander showed up today...... Will skip the negative reviews and go straight to positive.It never made it to my reloading room,went directly to the machineshop,haha.Needs some fixin right out of the box.
problem with the M type is you MUST have the case length exact or 'play' with each case a bit. I've moved on to M type expanding but Lee flare. I only trim converted BO brass.