Well,

How about using the same set-up I use with my low-pressure, #6 lead Smokeless loads from the MEC, which run about 6500 psi at 1100fps? substituting #7 steel and including felt spacers and the Mylar wrap? Using the current shot bushing? We're talking fairly close-range shots here.

I'm not very well versed about MEC reloading, my friend does it for me.

I prefer wood to plastic, leather to nylon, waxed cotton to Gore-Tex, and split bamboo to graphite.