I got a R&D drop in for my 58 rem when they first
came out, i got it from taylors, i loaded smokless
as well as bp cases, but the down side of the R&D
cylinder is you have to remove the cylinder from
the pistol, but then so did clint in pale rider
i paid 225 for the cylinder which i might add was
3 times more than i paid for the smoke pole years
ago, i made a 8" nylon rod to knock out the spent
cases, so its a matter of what suits your needs.