Grouse take off like a bat out of he'll and can probably cover at least 15- yards by the time you get on the second trigger and re acquire your target. Most people need more choke for the scond shot than they think. Also, it's a lot easier to open a choke than it is to tighten one so better to start tight.
Spreaders are a good option. On a tightly choked gun I'll put a spreader in the right barrel and a regular load in the left. You just have to keep track of the different loads.
I agree with Jent and have your barrel man nake sure there is enough to hone out. I am sure both Mike and Brad would give you an idea of how much they could open the chokes before wall thickness wo uld become an issue. Also, might as well have the forcing cones opened while you are at it, again I there is enough metal to start with.
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