I have an old owl head iver johnson top break and a colt police positive both in what I call .38 short '' cant recall the proper name '' . I know I can buy the rounds although pricey and uncommon they are out there .Could you cut down the modern 38 case to fit and what would you guys recommend loading them with? Just enough to get it out of the gun and down range with just enough to punch a sheet of paper . The colt is very tight but the Iver has seen better days . But needless to say I dont want any hot rounds in them .