Maybe you could tell the police that they may change their story if a
child were to get shot instead of a cat.  It's a possibility if kids are in
the area, that would get their attention in a hurry.  Perhaps tell them not
only do you fear for the cats getting shot, but you also fear for kids
getting hit. Its worked for me in the past (different situation, no cats
getting hurt - abandoned car kids were playing in, wouldn't tow it until you
mentioned kids were playing in it).

 If I were close by I'd like to go after the BB guy too.  Rotten bun of a
sitch.  Shooting them isn't going to make them go away.

 Cops (please any cops out there I am not stereotyping!) sometimes seem as
if they could care less about cats.  Two neighborhood girls found two
kittens in a box on the side of the road, they called our local police
department.  The *nice* officer on charge told them to let them go in the
woods.  (I really wanted to show him the working end of his service revolver
for that comment)  It was October and already getting cold.  They know I
foster so came knocking on my door.  They (kittens) were absolute
sweethearts, I took them to the shelter and both were adopted within a day.

 Good luck, maybe the gun will jam and backfire so he'll get a load of BB's
instead of the cats.

 JoJo
 http://home.comcast.net/~zookeepr/fosters.html

 > I work as a volunteer with a DFW-area rescue group.
 >
 > A couple of months ago, we received a call from a man who is
 > attempting to trap and alter the strays around his apt. complex. He
 > also has a couple of neighbors who don't like the strays, and one
 > jarhead has been shooting at the strays with a pellet gun.
 >
 > We haven't yet found a suitable place to relocate the strays and are
 > still trying to trap them all.  In the meantime, does anyone have any
 > ideas how to deal with Mr. Gunslinger with the pellet gun?  The man
 > we're helping has already reported the shootings to Dallas police, as
 > it is illegal to fire this type of gun within city limits, but they
 > don't seem interested in even speaking to this guy. Obviously it would
 > be nearly impossible to catch him in the act.
 >
 > I have already offered to stake out the place and put a BB in this
 > guy's butt, but we're pretty broke and I doubt my fellow cat ladies
 > could bail me out.

I would get some rescue groups involved. If you have a Humane Society in
your area that may help because they possibly work with local law
enforcement to enforce animal cruelty laws. I'd also contact the local media
as well. You'd be surprised what would happen to Mr. Gunslinger if this
became public. He certainly would have no place to hide due to the public
outcry.