I was loading my 505 Gibbs on my RCBS Rock Chucker Supreme without any issues, you just need to buy the 1"-12 adapter plug for the 1" dies. I still have mine actually.
Years ago I had the RCBS and Redding 50BMG size presses, but due to my shoulder injury, the handles on both were just too long for me and fatigued my shoulder very quickly.
Cheers.