I think with the medium plenum it should be no problem at 20fpe.I'm looking at the DRS 500 classic and i'm thinking lightweight barn/indoor gun? Has anybody tried to tune it down to less than 20fpe?
With the sub 12 ftlb plenum you will probably have to increase the reg pressure and hammer spring tension so that the rifle will react very nervously and your shot count will drastically decrease. I would definitely go for the HP plenum.
Just my thought !
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