My 20 ga reproduction barrels that I've had Brian add a set of the Galazan 16 (Krieghoff) barrels and stock to my dims because the native claro stock broke while shooting though marked M/IC were NOT M/IC. I measured them and they were Left = 0.018 constriction and right 0.016 constriction.
I like to split the difference between IC and Skeet in right and M and IM in left. I've done this on paper and it has worked very well on farm pheasants and Woodcock and Grouse for me.
I typically lengthen cones if there's plenty of thickness unless it's a collector gun. I have seen the benefit on paper of this effort as well.
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