I will have my S&W model 640 arrive by Thursday or Friday of this week the only problem is the specific ammo I want to carry in it is on back order for a while (135gr. speer GDHP for short barrel). I do have a box of 158 gr. speer GDHP that is used for my girlfriends S&W 686 with a 4 inch barrel. So I am wondering would that ammo/gun combo be something that I could depened my life on (knock on wood) until my short barrel ammo comes in from being backorder. OR does anyone have any other ammo suggestions that would be good for carrying for self defense. I am open to any and all suggetions. Thanks in advance.