Trouble I see with Sabots,(other than my intense dislike for them and the guns that shoot them) is no lube, plastic fouling in the grooves and difficulty loading after 1 or 2 shots- not to mention - OK, I will, their cost!

Now, if you would turn some rings on the plastic sabot for bullet lube, perhaps they'd work. If I had one of those 'beasts', I'd shoot full size lead bullets with flat noses, ie: a .50 bullet in a .50 and .54 bullet in a .54.

The rifling twist in most of them is 35" - some might be a bit faster and that's an improvement. The 35" probably won't stabilize a 300gr., .43" bullet unless it's running well over 1,500fps. The inlines I've seen have 15/16" barrels. You would never find me shooting 150gr. of any kind of powder in a .50 calibre with any elongated bullet. The pressure generated will be in the 30,000psi or higher range - no way, no how.

Actually, you'll find that I've ever fired one, nor ever will.

I will use slugs in a properly constructed muzzleloading rifle, in fact have two slug moulds for my 14 bore at this tiem - a 560gr. to 1200gr. adjustable mould I made myself, and the 730gr. minnie bullet designed originally for the .69 US rifled muskets.

I prefer to use round balls, as Tinker does and find they kill game better than elongated bullets. if you want more power, go bigger - 16 to 14 bore are about adequate to perfect for most any game, anywhere.