So, you would of got that stander if it was the size of a shed?
Still, at least the pellets are showing potential rather than outright 'shotgunning' a 'group'.
I had only one instance of wandering pellet syndrome with sorted & weighed AA Field 4.51 (classic example of the pellet going right just before the target) at Horsham. Stuff the batch number I've got:- 100 2310 49, I'll try the Falcon's & a different batch of the AA.
"I wanna play cricket on the green, ride my bike across the stream, cut myself and see my blood, I wanna come home all covered in mud. I'm a boy, I'm a boy but my ma won't admit it..." I'm A Boy- The Who 1966