When Remington was producing their "Accelerator" sabot rounds, I played with them in .30-'06 and to a lesser extent in .30-30. Accuracy was not that bad. A Model 700 that was capable of sub-MOA groups with good .30 caliber ammo shot about 3" with the saboted .22 bullets. The .30-30 Accelerators shot about 5" our of an iron sighted 94 Winchester, not a lot worse than the normal 4" .30 factory load.
The groups were not all that bad, and I could see the advantage of having that flexibility. But, the problem was that neither gun shot to the same place with the Accelerators as with the normal loads. With the Model 700, for example, I would have had to make a big (8" up, 5" right) adjustment to the scope to bring the .22 group to POA at 100 yards. And of course, reverse that when I changed back, presumably after varmint time turned into deer season.
IMHO, any supposed advantage was outweighed by that disadvantage. Others might disagree, and Remington did deserve some praise for innovation.
Jim