Other than the 2 petals that didn't fold over, I'd say that it can't expand any further. The other petals are completely folded over and expanded as much as they can. Pretty impressive with such a low powder charge.
I often wonder why/how a lot of people under estimate the performance of muzzleloaders. Given this load (or any load between 200-240 gr) and a velocity of 1300-1500 fps, how anyone can say it's not sufficient for deer. The ballistics are very similar to a 44 mag, which I wouldn't hesitate up to 100-125 yds (depending on the bullet weight).
I took my dad's G2 44 mag with an 8 inch barrel and Hornady 240gr factory ammo and hit what I was looking at at 150 yards (a small spot on a mud bank across a lake). The mud flew and a HUGE crater was created. Based on that, would it drop the deer in it's tracks? Probably not. But is it sufficient to be effective, maybe. But either way, the ballistics for that load at 100 yards are more than enough.
So take that factory ammo and compare it to the lighter ML loads. I think you'd find that they are comparable. So why not a "light" muzzleloader load at 100 yards?
Thank you for this test. It told me what I wanted to know about a light load for my son.