I confess I started with an RCBS Rockchucker 35 yrs. ago, but I graduated to a Dillon 450 when I found I was shooting up ammo faster than I could load it. That 450 was upgraded to a 550 some years ago and it pretty well serves my needs, but for high volume shooting a 650 would be very handy. A .500 isn't a high volume gun for me. My loading needs for it are nicely served with my 550.