I agree, 10mm sends projectiles supersonic every time so you get the magnum style boom. They create a more consistent hydrostatic shock cavity every time. They expand hollow points every time, even at longer handgun ranges (50 yds at least)
My handloads are very consistent, very controllable, and create similar energies to full tilt 357 magnums, maybe slightly more than. This is all out of a Glock 40 MOS holding 15+1 if i need them. 10mm is an awesome round. NO, 10MM IS NOT AS POWERFUL AS A 41 MAGNUM. Maybe a full tilt 10mm has similar energy to a lighter end 41 target load.
I mostly agree, especially that 10mm doesn't approach .41 Magnum. Much of the comparisons between .357 and 10mm are valid, with considerations. Bullet weights are important in determining the "equality", because the sectional density varies, and that is an indicator of penetration capability, other criteria being more or less equal. This is one area where the comparison to .41 Magnum falls flat.
If you have a .41Magnum shooting a 210 grain bullet, the sectional density of that bullet is 0.178, and it can be loaded to a velocity of around 1400 fps from a 6" barrel. A 10mm shooting a 200 grain bullet has a tiny advantage with a sectional density of 0.179, but a hot load will only get you around 1100 fps from the typical 5" barrel, and then the KE= 1/2MV^2 equation comes into play, and the .41 wins. Maybe the field is equal if you're shooting a .41 snubbie, but not likely will you lose 300 fps by giving up 3 inches of barrel.
The comparison between .357 and 10mm is a similar issue. Does a lower SD bullet at a higher MV, or a higher SD at a lower MV balance out penetration between the two? I prefer the lighter bullet at the higher MV for defense loadings in my 10mm, I use 155 grain bullets, which I can load to around 1400-1450 fps in the 10mm. Those bullets have a SD of 0.138, which is lower than the 158 grain I use in the .357, which I can also load to around 1350 fps for my 6" gun. The .357's 158 has a SD of 0.177, quite a bit better than the equivalent weight in the 10mm's 155, although since it gives up some energy in velocity, they may be fairly equal. Once you go to the 180 grain in a .357, vs. the 200 grain in the 10mm, both SD and velocities are very similar, so again, relative equality.
Of course, this is all theoretical, based on mathematical ballistics, and it probably comes down to placements of your shots on a live target.