I have about 500 cast 40 cal bullets, that I would like to try the plain base gas checks on, just to see how they perform. I did order a trial size quanity of aluminum plain base gas checks from Sage. The bullets are already sized to .4005, and grease lubed. I do have a 40 cal Star sizer die. Can I run the bullets base first through the Star die, properly seating the gas check, or do I have to press the base against something solid to get a squarely seated gascheck? I do have a Lyman gascheck seater tool for my Lyman press, but no 40 cal die for that press. This is sort of a unique situation, as there is no step on the back of the bullet for the check to snap onto. What procedures to other users do?