Recoil lugs and accuracy

[Edd]

The number:
.001 x (avg action length) 8.0" = .0015/12.0"
1000yds = 3000ft
.0015 x 3000 = 4.5"@1000YDS

Why do you use action length in the calculation instead of barrel shank diameter?

 

[Greyfox]

The claim(at least from Surgeon) is that the integrated lug allows for a greater amount of threaded support between the barrel and action because the inside of the integral lug is threaded, enhancing strength and rigidity...my paraphrasing. I have personally not seen a difference in accuracy between the two designs.