First of all, the majority of 41 magnums do not have short barrels and the Night guard model is fairly rare and I can't find it in the current S&W line-up. Secondly, the velocity differential is only true of certain loads. With the 175 gr. silvertip 10 mm load, My Glock 20 develops higher velocities than my model 58 Smith & Wesson 4 inch barrel with the 175 gr. 41 mag silvertip. The Winchester silvertip loads for both 41 and 44 magnum are both relatively low-velocity loads in both those calibers, but in 10mm, the silvertip load is faster than the Hornady, federal, PMC or Remington load in the same 175-180gr weight. But with the heavier bullet loads the 41 magnum comes close to the 44 magnum even out of a shorter barrel and is capable of a lot more power than the 10mm can produce with heavier bullets. The average velocity loss or gain is 50 fps per barrel inch and the 41 magnum with bullets weighing 220 grains up to 250 grains can launch those bullet weights at more than 200 fps faster than the 10mm can and 230 grains is about the limit for the 10mm because a 250 grain bullet would have to be seated so deep in the case to fit in the magazine that there wouldn't be enough room for very much powder. Glock Talk is supposed to be publishing an article of mine in the articles section next week that will tell you everything you ever wanted to know about the 41 magnum (including a comparison to the 10mm) but were afraid to ask. The 41 magnum and I go way back and I'm also a huge fan of the 10mm and the Glocks 20 and 29.