Checked Walmart yesterday and found they had a new batch of the Gamo Whispers. These appear to be free of the defects I found the last time I looked.
I picked up a fresh tin of these, though for now I'll keep these in reserve.
Hopefully this is a sign of improved quality control.
The POI of the Whisper is close to that of the Beeman wad cutters I've been using, but far enough from the center that I'd have to adjust my sights to compensate.
I'll test fire enough rounds to see which of my two .177 rifles group best with the whisper and adjust the sight of that gun. The other will be left sighted in for the Beeman wadcutters.
Only one of my .177 38T revolvers will accept the whisper into its chambers without excessive force in seating. That's Frankenstein, its sighted very closely for the whisper so I'll use the whisper in that revolver only. Franky gives a stronger impulse and higher velocity that the other revolver which is a completely stock later production version, so Franky is better suited to the heavier Whisper pellets.
Frankenstein gives excellent accuracy at 25 yards or more with practically any pellet so it can utilize the Whisper's long range performance a bit better.