Looking at the drawings of the 1881 action, it sort of makes sense that the tip of the firing pin be beveled to some degree so the lowering of the block will help push the pin back into the block to clear the primer and case.

What primer are you using?
The magnum primers seem to be a bit thicker so harder to dent with the firing pin so, as long as you get reliable ignition with these, they may help in the sticking firing pin department.