Put any 25 shooters in a pub with a pint and you will come up with 25 different ideas on the perfect gun/choke/barrel length/hair colour/lipstick/etc/etc combination!
Driven grouse shooters are no different, they are just much more wealthy!
Traditionally grouse guns were choked the right (or wrong, depending on your view) way round: ie tighter in the first (right) barrel than the second. This was especially true of non-selective single trigger guns.
However, there are so few dedicated grouse guns around that I have only seen this a few times.
One pundit, whose name escapes me but he had spent a life time killing driven grouse, swore by 3/4 (RH) and IC (LH) (0.030" & 0.005") or LF & SK if you prefer (according to Briley).
Personally, if you can point it in the right direction, I think the choke and barrel length matter less than the Mutt Behind The Butt!
Last edited by Toby Barclay; 09/02/12 02:35 PM.