Factory forcing cones have been measured at between 1/2" - 3/4" long depending on gauge and the accepted standard for the time period. Ideally, that point should be at, or just a mere few decimal points before, the terminal end of the cone.
For example, an open 12 gauge UMC(or any other shotshell manufacturer) 2 1/2" shell might actually measure as much as 1/16" shorter or longer than the 2 1/2" prescribed measurement while Peter's(or any other shotshell manufacturer) 2 1/2" equivalent might measure plus or minus a slightly different length, while others might measure exactly 2 1/2" on the nose.
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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