Lee Labas is one of the best double rifle men in the USA in my opinnion, of that I have little doubt...another is David Yale in Yellow Jacket Colorado, they both can make a double shoot whatever it is capable of....

If one wants to know what his double is capable of shooting in terms of inches, then shoot several groups with each individual barrel, the gun will shoot as well as the WORST barrel will group...then it can be regulated to that point, and brought to the POI at whatever range one desires, usually 50 yards.......