If the slug I was shooting weighed in at the estimated 96 grains that the OP has listed in his graphic, I believe you're absolutely right; out of my springer. They most likely wouldn't even make it all the way down the bore before stopping.
Although they have a pronounced arch to their trajectory, I am able to shoot the 25.4 grain monster pellets accurately enough for rabbit and feral pigeon work out to 50 yards. The estimated weight of my design only came in at 28-point-something grains. (mine were intended to be hollow pointed to bring down the weight) With the power mods I've tested in my springer I'm more than sure that my design would have no problem making it to "The Intended Target." Making it there accurately is something else all together though.
I have shot the sized-down NOE 35 grain cast bullets out of it, indoors; just to see if my Umarex Octane had the balls to get them out the barrel. It seemed to do just fine but, admittedly I was shooting into a ball of old rags, not at any distance or target. When I sized them down, it completely shaved off all the drive-bands so I was essentially shooting a solid slug of lead.
I've acquired another toy to play with for now so I'll look forward to the progress that rsterne achieves with his design. I did have plans to to buy an AirForce Condor with my tax return but I opted to spend it on a new Tikka T3 instead. That's the toy I'm playing with for now.
Incidentally, I think my barrel twist is 1 in 16. I believe that would be plenty of spin to stabilize pellets up to 30 grains out of my gas springer, regardless of what the computer generated calculations estimate.
HollowPoint