Correct. I mean no disrespect to the hydros, but there are many copper and brass solids in existence. For regulating a dangerous game double rifle, your first attempt is always to reproduce what it originally had when new: a lead core FMJ bullet. Only two exist: Woodleigh and Hornady. Because they have different contours, one is going to regulate and the other is not.
Once we get into softs, non-lead bullets, and modern lathe turned solids the choices become endless. Those endless options are novelties that a double rifle owner may wish to play with AFTER they have a functional rifle using the traditional FMJ load it was built for when original.
