It's great that your 12 bore shoots sabots so well and it is understandable that you are very proud of it - and indeed, it is an achievement. Thanks for letting us know how well a rifled 12 'can' shoot, even if it is with small bullets.
: For years, I've had a yen to buy a resonablely good .410 double 3" chambers and cut the barrels off at 26". I'd then have them rifled and use maybe 9.3X74 brass, BlackPowder and cast bullets. Maybe one day.
: For now, I'll look for a good double-lump smooth 12 bore for a ball gun. After hunting in this porvince for 30 years, I've yet to have to shoot a big game animal past 95 yards. Properly loaded, the smooth 12 will handle tham all - and be fun doing it.