I noticed most of the double rifles have a longer LOP than bolt rifles. Is there a reason for this? Would you order a double with the same LOP of your bolt rifles? Or are they made longer because they are mostly shot in warmer climates when the shooter is not wearing a coat?

Well I might be totally wrong but on the double rifles that are not made to order it makes sense to make the stock longer as it is easier to cut one down to fit than make one longer
Bill

Yes, No, and probably.

Seriously, you shoulder and shoot a double more like a shotgun than a bolt rifle.

speaking from limited experience...only owned one DR, a Kreighoff 3" .500 NE.

Rich

My double rifle (a German .250-3000 from the 1920s) has the same dimensions as my British sxs shotgun. As a result, when I shoulder it I find myself looking right down the sights, exactly aligned as they should be.

The match was pure happenstance, but I'd certainly specify those dimensions, were I to order one built to my specifications.

They are shot with open sights and the length of pull is not as critical as with a scope. On bespoke rifles the length of pull is made to fit the buyer.