I thought the rock chucker came out in 1967. I have a 1968 rock chucker. Can you post pictures of yours. I heard they are quite different. The old ones had a 2 piece mount.My advice is: don't scrimp on the press. You will mess with lots of other tools and gadgets over the years, but if you get the right press, you never have to change it.
My main press is an RCBS Rock Chucker I got in 1964. Can't tell you how many bazillion rounds it's loaded.
I suppose if I had to replace it, I'd look at a Forster CoAx, but it'd be tough to get me away from a Rockchucker.