You are really underestimating the cash potential of a raffle with a $1000 collector S&W gun on it! Easy $10 or 3 for $20 sell. I would also consider 500 tickets. So what if you only sell 350, you still earn an easy $3000 with a maybe $150 set of Magnas added as the only cost. Since it is for the museum, go to the WTB and ask for a free set of Magnas and I bet you will find them. Throw the Franzite grips in as well. Add a couple of back room items that the museum does not want for 2nd & 3rd place and it will be a sell-out.
. . . and don't forget to advertise tickets here on the Forum! That gun was manufactured in 1950 and would be a very attractive piece for anyone to own. What is the name of the museum?