What reloader for reloading 2.5" 12 gauge

[King Cobb]

We used to reload back when I was growing up a lot on my dad's old MEC progressive, but it was stolen about 10 years ago out of his garage. It worked great for reloading for Skeet. It looks like it was a sizemaster, but having been bought in the 70s, it is probably an older design.

Anyway, I have read that the short shell conversion kit is only made for the MEC 600 and won't work on progressives. I have also read this isn't the case.

I went into an old gun shop up in Houston the other day a friend reccomended and they had several used MEC's for sale.

They had a sizemaster but it was a little more then I was looking to spend, also had some MEC Jr. 600s, but also had some older used ones a Speeder, a versamec, and a super 600 progressive that looked like the were in my price range.

Any help or suggestions would be appreciated. I am acquiring a collection of RST 2.5" 12ga shells, so that is what I plan on reloading.