Re: How do I check the powder/shot charge on my MEC
Just put the shell into the slot, dump the charge, raise the ram, then pull the shell out from the lowered wad finger guide bottom first. Takes a little effort, but it can be done. I see no reason why your cut down shell would not work as well.
What kind of problems are you having with the cut down shell?
I have Mec 600, SizeMasters and Versa Mecs and I have never found the stated bushing size to match the powder charge, never. I decided a long time ago to ignore the weight and just go with the proper bushing size. Been doing it this way for 40 years, still got all my digits.