Ok, I've tried many of the Remington Accelerator Sabot loads over the years in fact I still have a few original boxes of the .308 Win.
Today if I want a .30 cal Sabot (.22 bullet) I use Accelerato EABCO sabots, I've loaded them into everything from my M1 .30 Carbine and 7.62x39mm AK to .300 Wby Mag and more, actually, they shot much better out of my Ruger Single Six .30 Carbine revolver, So what have I found?
(1) You want nothing on the end of your barrel, when I was shooting an M1A with a flash hider (my first use of them) I couldn't figure out why I could hit a bull in the "A" at 100 yards, this was with Remington factory accelerator, after a couple of trips too and back checking the target I looked down and about 30 feet in front of the bench was these sabots with the peddles all chewed up, yep they were opening and hitting the flash hider on the way out.
(2) someone here made mention of a tank gun and perhaps a smooth bore might work, nope...but! a true HK polygonal barrel without a flash hider does shoot them much better.
(3) Faster twist barrel even with heavier bullets is not the answer. I've load bullets from .22 cal... from 40gr to 95gr's pretty much all the same.
(4) For some reason they just don't go fast easily, once you get close to 4000 fps you're pretty much there from my experience in trying to get them to go faster, maybe someone has some super sauce load that I don't know about and/or haven't tried???
(5) Never fire them in a suppressor or muzzle brake.
(6) Accelerator Sabot sucks they are just for fun, a novelty item.
That's my 0.2 on the subject. Cheers