>>64093307
>10mm is underloaded as well most of the time.
Sure, but every store that sells 10mm has Underwood, Buffalo Bore, and Grizzly (3 hottest commercial load). While most shops selling .357 magnum only have stuff like Federal, Remington, and Speer, you're lucky if you find some Buffalo Bore .357 Magnum at your local shop.
>>64093907
>Even the cheapest, most underloaded 180gr 10mm is hotter than most 40s&w, people keep saying this but it's mostly bullshit.
Paul Harrell proved that the only company keeping this myth alive is Federal, with their 10mm being loaded exactly like .40 cal (and their 10mm and .40 cal being weaker than every competitor's .40 cal too). All the other companies' 10mm was stronger than their .40.
>>64094364
Pretty much the only FN pistol that isn't breaking are their .45 and their 5.7. They've managed to fuck up 10mm, 9mm, and .22lr.