These might be slightly smaller than the common .22 rifle size, which are usually 1/4 of full sized, (the ones used for centerfire matches).
But, maybe NRA rules differ a bit
The distances our club uses for .22 rifle are 25, 50, 75 and 100 yds, for the smallest to largest targets, respectively.
For .22 handgun, the distances are halved, for the same sized targets, or the same distances for double sized targets.
Lock the doors, they're coming in the windows.