Just messin around and I found this. I found the address for how many bullets come out at once, so you could make any gun like a shotgun. BUT the address is different for every map. So I just made it for the beach, just to mess around with.

*Note: you can do this with any gun. This is just for the Colt 45 though.
This is offline, ONLY for the beach.

#Colt 45 Super Shot
;zkobman
;Use w/ inf ammo
0x011D9E98 0x7FFF0001

If anyone wants the full code, just ask for it and wait. I am trying to get through the game and get the addresses.