I am and they seem to work quite well. I can't give you real accuracy numbers yet but I was hitting a 9" gong from an offhand supported position @ 100 yds consistently.
I am using Lee tumble lube and have had no leading problems so far.
This includes both sub and supersonic loadings using WC680 raging from 8.5grs to 15grs.
Make sure they are seated deep enough though.
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