Originally Posted by Mas Ayoob
Not as simple to answer as to ask. A good hollow point .40 will cause more fight-stopping trauma than a full metal jacket .45. With equivalent loads, the two calibers are reasonably close, though the .45 will tend to tear a wider wound track if velocities are the same.
Being a former Marine I have lived within the Corp's bubble of 45, 45 ,45 and then 45! Your reply helped me see the 40 caliber side! Today I purchased a CX4 Bettera Storm Carbine in 40 caliber! The carbine might not give me more stopping power but it will surely increase my accuracy!
Many Thanks Mas for both your humbleness and street experience!