It's going to vary between manufacturer's and bullet weights, but avg velocity is around 1050 fps
Depending on bullet weight and powder, 650-1000 fps or more.
@ 4000 fps or so
Yes.
Yes, I have one
What model?
1865
Need the serial number to answer.
No
No, no, no. Do not attempt to do this.
NO
100-450 USD
Your smith and Wesson model 64-3 was made from 1977-1987.