Funny thing you have brought this topic up. I turn 69 next month and this subject has been on my mind. I am starting to look at maybe purchasing a Parker VH 20 bore with 28" barrels. As I only shoot doves this would be an ideal gun.
Next items on the list would be,
20 bore Fox, 28" barrels
410 over / under of some maker
20 bore over / under, maybe a Browning Superposed.

I have two Rizzini's I purchased last year a 20 and 28 but I do not shoot the 28 very well so it will be on the market soon enough.
My Perazzi MX20 is kind of a heavy 20 bore with the 31 1/2" barrels

Mike Proctor