Yes, it is. Were the bullets solid, they would be grossly inaccurate.
The hollow based projectiles fly quite well at normal for today air rifle ranges, especially indoors, where most shooting is 10 meters or closer.
Foster slugs do quite well at close to intermediate ranges.
In some guns, like my rifled Mossberg, they also do very well in rifled barrels, but usually not so.
The standard pellet of today, will shoot reasonably well from a smoothbore, due to the shuttlecock effect of the pellet.
As the velocities get higher, spin must be incorporated as well, to maintain even better accuracy.
Most modern air rifles have rates of twist faster than needed for this purpose.