If:It is close rangeYou use enough pumpsThe crow is standing perfectly stillYou are an excellent shotAnd you put it right through the crow's eye,Then yes, you can kill a crow with a Crosman Pumpmaster 760.
See the link below for the owners manual.
See the link below.
See the Crosman link below for the diagram.
There are several versions of the 760. See the link below for all of the crosman models with dates and manuals.
11 mm dovetail rail
There are 12 versions of the Crosman 760. Which one do you want.... See the link below
The 760 is not designed for rodent control. It was designed for simple back yard target shooting. You may be able to kill the snake but it most likely would take several shots.
I suggest you direct this question directly to Crosman Customer service. See the link below.
See link Below! There are about 11 different versions of the 760, See the link at the bottom of this page to select the one you need. (It's all the Crosman air rifle models.)
To answer this question you would have to go back to Crosman and ask them directly. See the link below.
Go to the link below, and click on "customer care." I believe Crosman still repairs these rifles.