A sabot is the pencil's point. But, if you compare a flattish nosed 12-ga slug (the eraser) with a pointed rifle bullet, the slug may have more energy but the point of impact unit stress is significantly below that of the bullet.
It would take a heck of a rifle round to equal the force the 12 ga slug gives.
Force is a nebulous term and can mean a lot of things, I suppose you mean
Kinetic Energy. Let's look at the numbers, from the manufacturers' data on muzzle energy on your 30-06 and a 12-ga:
30-06 Rifle bullet, Federal Power-Shock 180-gr =
2,913 ft.lb.
12-ga Shotgun slug, Benneke K.O. 1-oz =
2,491 ft.lb.
My initial guess was wrong, the bullet has about 17% more energy at the muzzle than the slug.
Now let's look at the kinetic energy in terms of the impact area:
30-06 has a diameter of 0.308" and an area of 0.0745 sq.in., 2,913/0.0745 =
39,100 ft.lb per sq.in.
12-ga has a diameter of 0.729" and an area of 0.417 sq.in., 2,491/0.417 =
5,973 ft.lb per sq.in.
Neglecting the point v. eraser, the bullet's energy per unit area is 555% that of the slug -- I'd say that's significant. Unfortunately, I don't have the data required to do a similar comparison at target distance. Down range, the slug has a mass advantage while the bullet has a drag advantage.
Think of the slug as hitting your target over the head with a brick and the deep penetrating bullet as stabbing him. If he's big and bad (thick skinned) enough, the brick may just make him angry, but the blade will ruin his day. That being said, on this continent, the brick is usually more than enough.