The sabot has ALWAYS been the weakest link in modern muzzleloader shooting. Just like shooting in warm/hot weather, if you don't let that barrel cool down, you'll throw bullets.
I'll just say this, I have no clue what post #2 is talking about.
If you shoot a 50cal and bullet to bore, you're not loosing anything over shooting a sabot and a 45cal bullet in a sabot in that 50cal. Likewise a 45cal and shooting saboted bullets which are smaller than the bore size.
The most accurate muzzleloaders, rather 50's, 45', or others are
ALL shooting bullet to bore. I can also assure you of this.............. Inline muzzleloader competitors are all shooting bullet to bore.
Sabots are and always have been, always will be the weakest link.
Arrowhead XLD bullets
Bullets & Sabots – Arrowhead Rifles
Fury bullets
Black powder muzzleloader (furycustombullets.com)
Parker bullets
Muzzleloading Projectiles -- Sabots-Ballistic tip-Traditional Hunter – Parker Productions Inc
Pittman bullets
Pittman Bullets™ - High Performance Muzzleloading - AccuMax ™.452" / AccuMax ™ Hard Core .452" Muzzleloading Bullets