There are shooters who don't like the recoil on the 357 mag so the 38 spec and 38 spec +p fills there need. On the other had there are 357 mag owners who want more power than the 357 mag but don't like the recoil of the 44 mag this is where the 41 mag nitch comes into play.

I believe there are more 41 mag owners than most estimated. My LGS told me the shipment of the 41 mag ammO was the first shipment they have seen in two years. I think if the 41 ammO was not available there just
Maybe more 41 mag owners than we think out there.