LB
Bell's test, of lengthening the forcing cone, was to explore the specific pressure effect lengthening a forcing cone had when shooting an assortment of 2 3/4" shells in an English type 2 1/2" chamber originally with a very short forcing cone .
I'm interested the test parameters of Miller's work on forcing cone effect on patterns and how that compares to what I did.
I did stumble onto Jim Eyster's work from 2010 on forming a radius in the intersection "corner" of the cone and the bore on a 2º cone of a Blaser. My recollection is that a SAAMI cone is 5º (from the bore axis). So the Blaser has "long cones" from the factory. His rounding of the corner showed a significant benefit in pattern performance. What I didn't see in Jim's study was any dimensional description of how big the radius was, etc..
http://www.jimeyster.com/testing/documents/Forcing%20Cone%20Test.pdf
