I use .380" balls in all my .36 caliber revovlers, whether Uberti or Pietta. Simplifies things to carry one size of ball in my loading box.
Seating the .380" ball doesn't require much more pressure than the .375 inch. If you bend a seating lever doing so, you're either applying far too much pressure after the ball is well seated, or you've purchased a revolver that is junk.
In the early 1970s, when I first began shooting cap and ball revolvers, Spanish-made cap and balls were noted for having abysmally poor quality and made of pot metal, with little or no heat treatment.
Back then, it was no unheard of to see a revolver with a bent loading lever. By the 1980s, Spain stopped producing cap and ball revolvers and quality of cap and ball revolvers made elsewhere increased.
Today, if you bend a loading lever on a recently made gun, you're either abusing it or have found a fluke that was not heat-treated.