I have been to every page of every 15-22 and the word Performance does not exist on any of them. Nor does the word Laney. There is not even any mention about the chamber.
The stinger has a longer case .7 compared to .6 on standard high velocity loads. The overall length is virtually identical to the dozen different types of ammo I have for modeling purposes or well within tolerances. The diameter of the bullets and cases are within tolerances. The stinger has less bullet sticking out of the case with a slightly shorter primary and secondary seal ring .075 x .025 compared to .1 x .04. Vipers are .1 x .03
In the picture you provided, the round to the far left has almost the same distance from the tip to the sealing ring as the stinger to the far right. Mechanically, they should function the same.