Just talked to Patmarlin and he's coming out with a new adaptor that will allow push through boolit gas checking and sizing rear end first with any standard press using your Lyman/RCBS and Saeco top (bullet nose) punches with all LEE sizing dies.
What I love about this is I cast and shoot PB's (plain base) for all of my firearm calibers, and being able to swage my PB gas checks base first into my LEE dies would be a game changer. All my gas check shank molds too really. I would like to have one for each top punch I use.
I've got several sets of his Checkmaker Gas Check dies. They have served me well and performed great over the years. I've only had to have him rebuild one set, my first in 30 caliber because frankly I beat the crap out of them running 1000's and 1000's of checks. Sent them in and he completely rebuilt them and they work like new.