As Ian stated in his post, patterning with the shell you use most will tell you what the choke is, another manufacturers shell could and most likely will be different.
True, and exactly why thousandths of constriction is so important. It is a point of reference that all can agree upon, regardless of what load they use. If a .020" constriction patterns as a modified choke with a particular load then it is a modified choke .......
with that load. If it patterns as an improved modified choke with another load, it is
still a gun with .020" constriction.
There's too much arguing over semantics, IMO. One says choke and really means constriction. Another says choke and means patterns. Who is right and who is wrong?
What does it really matter? Just ask what the constriction from bore diameter is and you will have a very good starting point to guess how it will pattern.
SRH
