Confused by 40 vs .45 ballistcs
I have one of those jobs where I pretty much sit around doing nothing until something breaks. Because of this is spend a large amount of my time sitting around reading. Recently I procured a S&W M&P40c. It's my first .40 and I didn't (don't) really know much about the round. With the aforementioned amount of time I have on my hands I have been doing a LOT of reading on the .40's ballistic properties and have come to the conclusion that I am thoroughly confused.
It seems like the 185g .45 load is pretty popular now days. People tend to like the .45's big slow bullet because it (and I'm paraphrasing) "Plows through bone and flesh". Fair enough. I love .45. I'm wearing a M&P45c as I write this.
A popular .40 load is the 180g. People tend to like the.... well to be honest I don;t really know what they like about it. All I know is that it's pretty popular.
The thing that I don't get is this. When I look at ballistics charts from several websites the average .45 185g loading looks something like 950FPS and around 375 ftlbs of muzzle energy. The average .40 180g looking something like 1000FPS and around 400FTLBS pounds of energy at the muzzle. What am I missing?
It seems like the 2 rounds are darn near ballistically identical with the slight edge going to the .40. It seems like the .40 would "Plow through bone and flesh" just as well the the .45 (unless that only applies to the heavier 200g and 230g .45 loadings) Granted the .45 has a larger diameter and I'm not sure how much difference that makes. The reason I ask this here is because I realize that numbers on paper rarely tell the whole story so I am interested if there is some variable I am not seeing.
Sectional density calculator