What was the point of that? I think we all know what the 10mm is. My point is that the 10mm is a ballistic twin of the 357Mag. The 10mm can launch 180gr and 200gr projectiles at the same speed the 357Mag can. The 180-200gr. bullets from the 357 are obviously going to penetrate much better, which is what you want on a bear. Although the 10mm's ballistics look good on paper, its short case length prohibits the use of bullets of sufficient sectional density for heavy penetration. It takes a 200gr. 10mm slug to match the sectional density of a 158gr 357 slug and that is pretty much the max for the 10mm. The 180-200gr. 357 bullets are simply unmatched by anything the 10mm can dish out.
The 10mm is not equal to the 41Mag. The 10mm when loaded to max barely equals watered down 41Mag loads. The 41Mag can be loaded in excess of 1,000ft/lbs of energy. Its quite obvious that the 41Mag has a significantly longer case, thus it holds more powder and longer bullets. Its fair to say that when loaded to max the 357Mag and 10mm are about equal in energy levels. The 357Mag has more desirable characteristics for bear defense though. Better penetration and the use of HC lead bullets with large meplats. I don't think a Glock 20 is going to feed HC lead bullets where the meplate is larger than 70% of the bullet diameter. A revolver doesn't have to feed bullets only fire them.