That's funny, Chuck!!! ROTFLMAO !!!
Seymour,
"As long as I practice a lot, and mount the gun exactly the same way, I can do reasonably well. For me, consistency is an absolute must ."
You've got your head screwed on straight.
The key to consistency is a gun that fits. It's challenge enough to learn a proper, consistent gun mount without trying to use a gun that permits radical differnces in sight picture. I make my own stocks and I use 3 different sight pictures; one each for trap, sporting clays and grouse. I'd never carry a target gun grouse hunting, not even my target SxS. The mount I make on a grouse that flushes while I'm answering nature's call is no where near as reproducible as that I make on a FITASC target. I compensate for that less efficient mount by stocking my bird guns a bit lower. I like shooting sporting clays tournamnets with a SxS but I see no reason to shoot my grouse gun and keep my face off the stock.
No matter how well you shoot now, whether clays or birds, you'll do better with a gun that fits you for the task.