".................Seating checks square and tight on the old Lyman is a chore. In the end I was handling each bullet twice. First to seat the check by placing a piece of paint stirrer stick over the die and then to size it. Man, accuracy better go way up with the Ballisticast or it's back to liquid alox for me."

You can make a GC seater real easy for your Lube-Sizer. Lyman sells one also. To make one go to the hardware store and buy a 3/8-16 connector nut. Look like a real long, ah.........nut. Take a boolit with a new GC and set it in the die. Slowly lower the handle until you feel the initial pressure of crimping on the GC slacken a tad. Now, measure the distance between the ledge the die ejector pin rod goes through, and the bottom of the ejector pin itself.  

Cut the connector nut to this length. Now place the nut between the visejaws perpendicular to them. Make 2 hacksaw cuts through, lengthwise. Essencially remove about 1/3rd. Clean it up so it looks nice.

Now with the lube-sizer press handle up, ready to recieve a new slug, slip the nut around the ejector rod. When you place a slug and GC in place and lower the handle it will only go so far as the ejector pin bumps against the nut. This seats the slug flat into the GC. Remove the nut and go ahead on with running the slug in. Repeat for the next one.

It takes a bit, but you can get to adept to placing and removing the GC seater that it really doesn't add anymore time to the process at all. That is unless you drop it and it rolls under the reloading bench. You're on your own there.

...............Buckshot 

About that Lyman made check seater; I don't know how it should be, but I have one old #45 (thanks buddy, it's working fine) and Lyman made check seater won't fit in. Screw diameter in depth adjustment is too big. That same Lyman seater fits perfectly to RCBS Lube-Matic so I believe it's correctly dimensioned. Maybe there's two seater types? DIY version should be no problem anyway, just make lower end nicely curved so that it's easy to slip in and out.

Your press is too clean.

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Most presses have the press mounted ejector pin gummed up with old lube and the pin does not move freely.  The force required to move the press mounted ejector pin down will aid in the ability to seat the check.  Try adding some lube and driveway gravel or play sand to the moving parts.

Since you are running a hard lube, the viscosity goes down when the temp of your press goes up.  The viscosity is what helps to hold the ejector pin in the die while the check seats.  Move your heat source farther or turn it down.