The Remingtons are from the 1970's, the Winchesters are late 70's to early 80's IIRC. The military I'm guessing are from WWII era as they are loaded with 158 grain full metal jacket bullets. These are not the weak rounds mentioned above. In the 1950's the military shifted to a light 130 grain bullet with reduced velocity. This ammo pictured is loaded to 850 fps from a 4" barrel IIRC. Now days that would be +P ammo. Before the lawyer era most all standard 38 special, 158 grain ammo was loaded to 850 fps. Now that tort lawyers have arrived this same weight of bullet is only loaded at 750 fps in most cases. I would suggest not WASTING the fmj ammo at targets and instead keep it for times you need maximum penetration.