I just got a Berdan Sharps and am also looking for info on loads etc.
The link below has molds. I have one but got it in an auction.
I sent an email to this outfit but never got a reply so can't be sure he still exists.
Have not shot the gun yet.
Molds for these bullets are high. ($100-$150)
I'm going to also try a LEE R.E.A.L bullet also.
PS are you like me and just got the rifle on GunBroker auction site?