It is I! LOL
I get barrels of these hulls in my area. They actually load very well on my Mec 9000.
What type of powder are you wanting to use?
I use Rio hull and primer, 18.5 gr Rex I, Claybuster CB3118-12AR, 1 1/8 oz. VERY soft shooting, gives the breaks you want.
For caps, use 24.5 gr Unique, and the Claybuster CB3118-12AR behind 1 1/8 oz. This load is soft shooting, and will microwave a 27 yard bird with a good choke.
Loading free hulls is always good. Rio ammunition is made by the world's largest shotshell manufacturer. They make a good product. They also produce Kemen, which is top rate.
I prefer to load the Riefenhauser type hull with a very bulky powder and suitable wad.
Make sure your sizer is set so your hulls chamber without effort. These work without fail in 6 guns I own.