One great thing about handguns is that removable barrels mean you can easily see case support at the feed ramp. Just remove the barrel and drop in a case.
The prevailing wisdom is that aftermarket barrels offer better support than stock barrels. I have no doubt that was true in the past and might still be true in some instances. However, here are two pictures of my 357sig barrels, black being stock and stainless being Lone Wolf. It's hard to see the unsupported area of the stock barrel because there is virtually none. The brass color you see the could be mistaken for unsupported case is just reflection off the ramp. The LW obviously has far more unsupported area.
Even with the relatively large unsupported area, I have loaded rounds beyond SAAMI max (to the euro standard) and seen no evidence of problems/bulge/smileys.
The advantage the LW does have is a smaller chamber, which does help the cases last longer, in theory. In reality, I lose them much faster than they wear out.