Air Rifles used: Diana Magnum 350, 0.22 cal & HW80 0.22 cal, both open sights
Pellet used: G-Smith High Impact (dome shaped)
Pellet weight: 18.6 grains
Target: Beer cans (not filled...& neither guzzled by me else you'll will say "accuracy is due to that"

Distance: 58.79 yards (i.e 53.76 meters or 176.37 feet)
No bench used, free hand stance.
Percentile accuracy: 70% i.e. 7 out of 10 shots fired were taking the cans. Remaining 3 misses can be attributed to many things but I will attribute it to my own errors, in principle.
My question is:
Considering a standard target size of the beer can & keeping open the choice of air guns used (any caliber, any make, any power plant, any stance or bench rested BUT open sighted only)
what distances have you plinked at, accurately enough, to consider it a satisfying day?

Cheers!