If I owned a break barrel I'd try, sounds interesting.
Using my non break barrel rifles, I can hit the circle every time at 75 yards. Nothing to it, the circle being 12 feet in dia.
I own a bench rest, micrometers and digital scales. Tomorrow I will check pellets and see what I can do. I do not hold much hope.
That's a US dime at 40 yards. Is that from the muzzle to the target face?
Just hope it's cooler tomorrow than it was today.