Ooh cheeky!
Actually got it out at the club today... the pellet probe, what did you think?
And guess what, with the Steyr groups at 45 yards were exactly the same as without probing, except a couple of mm lower due to the slightly lower velocity (about 15fps). So good try but no cigar.
I will try the same procedure in the 80 next time I get a chance to see if it helps with a .22 springer but TBH it was grouping brilliantly at 45 today too