The point about sabots is you can get much higher velocity than with conventional ammo of the same caliber. The military does this with artillery. But you probably have to change the twist rate and use (or develop) different powder. Remington never did this. IIRC they just wanted to shoot .223 bullets, at .223 velocities, in existing 30-06 and 30-30 rifles. There wasn't much of a market for this.
As usual, Remington marketing people screwed it up.
The 30-06 Remington accelerators were over 4,000+ FPS with a 55 grain bullet.
