So you fired two shots and you get 4 holes?
These slugs were designed for the wad to stay attached to the slug during flight and to drag stabilize the slug.
It seems in your case the wads are detaching from the slug for one reason or another .... and this would explain the poor accuracy...
These slugs were designed for the wad to stay attached to the slug during flight and to drag stabilize the slug.
Are they? Gualandi themselves call it a "launching wad" and still being a foster design it shouldn't matter as long as it does either consistently. If it is indeed supposed to stay on during flight they should have chosen something more significant than a slight friction fit to attach them.
What he showed is a foster slug, a hollow based and front heavy design... The slight differences don't change that. The same wad system is used for many other slugs, all foster style. I have lost tons of wads in flight while shooting Score ammunition and the slug still manages decent accuracy. I would say something else is the issue.
I don't care what YouTube says, especially that guy. The people who designed and make them are who I want to hear from. So far I haven't found anything on their website or in their literature that says the wad is an important stabilizing feature.
They're the ones in the 10 rd box with the deer on it that cost ~$36.