It looks like the worst of both worlds. With a shotgun, you would logically want either the relative precision of a single projectile or the close-range devastating terminal effect of buckshot.
Compared with a conventional slug load, recoil will be substantially increased with minimal additional terminal effect from the three buckshot and the added risk of stray pellets.
Compared with a typical nine-pellet 00 buckshot load, the wound cavity will be much smaller.
The rationale for buck-and-ball loads went out with the issue of smoothbore muskets fired in volleys.