While I have never fired a side opening O/U Superbritte. I have held one and practiced mounting and opening it. It felt awkward.
That said I cannot say it was awkward because I was used to the traditional opening for sxs and O/U guns and that if I fired a superbritte through a couple flats of ammo on a range that awkwardness would disappear or not.
I believe that shooters get used to a particular action and actions outside that experience seem off.
I know that after shooting shorter barrel sxs guns 99% of the time picking up a 30 inch pump or auto or even 32in SxS feel like I am looking down the deck of a supertanker. I have the same odd experience when picking up a 12ga sxs waterfowl gun it feels very very wide and awkward.
Humans are creatures of habit. If someone exclusively used the superbritte action and became proficient with it that awkwardness would not happen.
I do not believe the action caught on because most shooters who tried one were already set in their ways and using it was not an easy transition.
