This thread has mostly referred to patterns. If and when I lengthen the cone of
my Manufrance Idal it will be only because Mr. Bell concluded that there is a
reduction in pressure when shooting 70 mm shells in 65 mm chambers. (I actually
use 67mm CIP shells in it).

If you are a good shot I am sure you never worry about patterns.

JC


"...it is always advisable to perceive clearly our ignorance." Charles Darwin