I've fired both the solid projectile grenades and bee hive rounds through the M79 Grenade Launcher. It's a fully rifled barrel and the bee hive rounds spread like bees chased out of the hive. It was more of a cloud than a pattern.
The grenade on the other hand was very accurate. With practice, you could lob one through a B-27 silhouette target at 300 yards with regularity.
Great grenade launcher, but poor "shotgun".
Hope this helps.
Fred