I gave up that experiment. For some reason .400 Cor-Bons just refused to feed properly in my Springer GI.
Sold the barrel, and dies, and cases I had for it. Fortunately I could use the bullets in my .40 S&W and 10mm.
That's to bad Gandog. Never had a problem in my Colt or RIA.
I am going to work up some new loads using a few different powders that I havn't found any .400 data on yet. I was curious to see if anyone had anything that they had worked up and liked.
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"It is useless for the sheep
to pass resolutions in favour of
vegetarianism" ~ R. W. Inge