I won't argue with your experience, but on my M&P a sized .360 barely goes through the chamber. On my 32-1, a sized .360 would press through the chamber if forced. On both the bullet barely enters the forcing cone. I have a 38 Spec Hand Eject and I would say the bore is almost identical. The cylinders are a bit tighter, but not much. I shoot .360s in the M&P and it is very accurate. I'm going to try some .358s this weekend in both and see where that goes. I have .363s but they are honestly so large that I won't fire them without resizing. They won't fit through the chambers without a lot of help. But I'm shooting pure lead, so we'll see if there are any issues.... but 38 S&W is definitely the most fun to mess with...