I did some tests at the old AmmoLab a couple of years ago and we shot numerous calibers and numerous loads from several different guns, into calibrated geletin during a long day of testing all manner of premium loads and bullets, etc.
We tested from .32 (no expansion from any round), .380 (HPs expanded little if any), dozens of the best 9s, 40s, 45s etc. to 9x23 and virtually every other pistol round in between. AmmoLab did testing for military, police, federal agencies and private security consultants at the HIGHEST levels of professionalism.
I learned that there is little difference and no meaningful difference, in geletin, between any premium rounds from 9mm up to 9x23... EXCEPT the 357 SIG from the Baby Glock which performed in a way that was a multiple of power above anything else we shot all day! There are two rounds I have learned that perform far, far, far, more effectively than expected; they are the standard power 357 SIG and the original power 10 mm (difficult to obtain now). I also learned that the polygonal bore of the Glock gives speeds that are far higher than rifled barrels of the same length.
I was stunned by the performance of the 357 Sig from the Baby Glock at AmmoLab testing. Since, I've found that this unique caliber is designed for service size, that being short, barrel length is FAR more than people speak of. My friend, who worked at Smith at the time, got our Delaware State Police to use the 357 SIG and they still do! The performance has been exemplary!
Rohrbaugh 357 SIG anyone!!!!! I will take one for sure Eric!