Originally Posted by greenlion
The Gen 4 GLOCKS seem to have fixed the light mounting problems with their stiffer recoil spring, so that will not be a problem in the future.
I like the technical info on sectional density Fred, but there is no such thing as a 105gr .357 sig doing 1600fps in the real world for us to purchase as far as I know.
The ft/lbs are not that far apart even given the seemingly wide difference in number you give for velocity according to sectional density.
125gr .357 = 584 ft/lbs
135gr .40 = 567 ft/lbs
Well the technical info is how you compare bullets/calibers, not just vel & energy. There are actually frangible practice rounds that are 100gr, but you can get a 115grJHP @ 1500fps+, will still do a bit better than a 135gr/40 in penetration, all things being equal. FWIW, energy in pistol rounds is pretty meaningless, especially 50ft# either way. You could certainly handload a 90grDPX (Barnes) to easily hit 1600fps & the monometal would be devastating to any animate target.
"Given adequate penetration, a larger diameter bullet will have an edge in wounding effectiveness. It will damage a blood vessel the smaller projectile barely misses. The larger permanent cavity may lead to faster blood loss. Although such an edge clearly exists, its significance cannot be quantified".
Last edited by fredj338; 04-09-2011 at 13:19..