I'm a really avid ruffed grouse hunter and have been in search of the perfect grouse gun "for me" since I graduated from college in 1984.
I think the perfect grouse gun for me is a 12 bore that weighs 6-1/4 - 6- 1/2 pounds. 28-30" barrels, straight grip, splinter forend. I like chokes of .003 & .007.
I have not found such a combination in an American double so my ideals have been English like this H & H Royal.
That said, I can't afford such guns so I only get to hunt with them when friends who can afford them visit and allow me to carry them.
I hunt with a 1925 20 bore VHE with 28" barrels. I've never measured the chokes so I'm not sure what they are but when I walk in on my dogs point I have complete confidence that if I do my job, the Parker will do its.