I have been thinking about a Remington Rolling block in the same cartridge....
It's not your stubby fingers, Ive come across the one sided bulge in seating the bullets before, if you use a full case of powder so it is compressed, like black powder, this will fix that. Or a load with something like 2207 if that fills the case so its a bulk smokeless load.
(Or you can try flaring the case with a slightly larger bullet size, so its deeper)
Those are very low 2207 loads, I would have started at the max 24g, it is all well under max pressure
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