I have been handloading on a single stage RCBS (RS3) press for 25ish years, am now considering a progressive press esp. for pistol. I load 357, 44mag, 45colt, 30 carbine, and now 9mm (this is the one eating the most ammo!). I have dies from Lee, Rcbs already and have a little dandy measure as well as a regular (forgot the name) RCBS measure. I have never even seen a progressive centerfire cartridge press. I have a Hornady 366 shotshell press that is wunderfull but that's it for progressives. If I should choose to get one, can I use my dies or anything else? I've looked at the Hornady Lock N Load AP, and the RCBS Pro Chucker 5. Is changing calibers simply a matter of changing dies, or do I have to buy new shellplates etc for each cal? I am just trying to decide how bad I want to load (esp the9mm) faster.