Quote:
Originally Posted by Tokamak
In the interest of playing around:
Since the difference in depth was .25 inches that means .25' = x% of 3" or x = 3/.25 or 12%.
Also the bullet is .38.32 or .06 wider or .06 = x% of .32 or x = .32/.06 = *5% bigger.
So the .380 drove its 5% bigger bullet 12% deeper into the paper. *
According to wiki  the .380 has 200 ft lbs of energy the .32 has 123 ft lbs of energy. *So that is an increase of 200123 = 77 ft lbs. 77 = x% of 123 x = 77/123 = 62% more energy. (that explains the recoil difference).
If the penetration was linear I would think that the .380 would go 62% deeper or so. *So like 4.86 inches not 3.25. *Im guessing that it takes a lot more energy to push a slighly larger bullet into paper? *
Any experts out there to explain this?

Buffalo bore .380 JHP hits almost 300 ftlbs....more than double the energy of any .32 round on the market. And it uses a Gold Dot hollow point bullet, which many experts consider to be the best hollow point design of all time.
Both DT and BB used Gold Dots in their 9mm line of ammo too, but then Speer stopped shipping out new bullets to them, so they're both using the target oriented Montana Gold JHP now, which in the "Box o' truth" tests was a MASSIVE over penetrator due to the extremely limited expansion potential of the Montana Gold bullet.
Personally, the one time i fired .32 ACP into phone books just so i could let my girlfriend hear the report and feel the recoil so she would feel confident if she ever had to use the pistol (a model 1905 savage), i was completely floored how deeply the standard velocity PMC blazer .32 FMJ rounds penetrated. They blew clean through 2 phone books and dug a 1/4" divit out of a concrete party wall.
I can only imagine what a full power euro round like Geco would do....or Buffalo Bore FN lead rounds.