Both the L-Frame guns and the N-Frame M28 have full length ejector rods. Shortened ejector rods are usually made necessary by very short barrel lengths regardless of frame size. You are probably thinking of full length underlug barrels on the L-Frame and that feature is not mandatory just because a gun is built on that frame size.

My personal feeling is that the ".41 Special" is a solution to a non-existent problem. The practical terminal ballistic benefits of a 210 grain .410" bullet at 900 or so fps from the ".41 Special" vs a 200 grain .400" bullet at about the same velocity from a .40 S&W or 10mm are slim to none IMO. The vast majority of .41 Magnum shooters hand load and creating accurate reduced velocity ammo in the full length case is pretty much a non-issue. If the only reason for a new case is to fit the round in the next size smaller frame revolver, well...........

Bruce