Used to have a Bowler grip on my High Standard Citation .22LR standard pistol.
Good quality and fit to frame ( in two halves if I recall ) I needed to play around with plastic wood and filler to get the fit I needed for R/H left eye dominance.
The factory grip on my Walther GSP needed no mods for standard pistol or rapid fire disciplines.
All the Rink grips I have had for Morini, Benelli and Pardini air pistols with 7 degree offset required minimal fettling as Thomas Rink uses a neat one handed system for palm shelf height and angle adjustment.
Just my opinion based on experience over 40+ years of shooting.
The single hole fixing through the grip is possibly suited to air pistol - someone may know more about this; Bowlers closed down some 15 years ago I understand.
ATB
Mike.