I would ignore it if it's just practice ammo. I don't think accuracy would be affected, and you could just leave them a little short on OAL.
You could put a wad of tin foil in the seating die and let the noses form their own custom seating plug. I use that for seating some soft SWC's in .357.
I would not any extra flare to the case, that would reduce bullet tension and could lead to bullet set back during the feeding cycle in the pistol.