First -- YOU ARE JOKING, RIGHT ?
The priming system on the various models of Dillon's presses are each different... I've heard of problems with the Dillon Square-Deal primer mechanism... but none on the 650.
The best (IMHO) of all Dillon primer systems is on their 650 press -- Their commercial 1050 model may use the same or a similar system as used on the 650 -- no personal experience on the 1050...
Anyway, I only have one simple complaint with the 650 primer mechanism: It's just too dern fast!
It runs out of primers after only loading 100-rounds... which means every few minutes I have to stand up, take a 'stretch' break, and load in another 100-primers.
No jams -- AND NO EXPLOSIONS EITHER !!! The 650 uses a wheel with holes cut in it to hold each primer separately from the others.
Doesn't get much better than this -- it just works, every time, all the time. --CC
[This message has been edited by Capt_C (edited 11-29-2001).]