Winchester makes a personal defense Silvertip HP in both 38 Special (110 grain) and 38 Special +P (125 grain). Both have published muzzle velocity of 945 fps. Muzzle energy is quoted as 218 for the 38 Special, and 248 for the 38 Special +P.
These ballistics are so similar. What is the real difference here? Can anyone help shed some light?