Originally Posted by sdeering
Much appreciated. I was thinking friction of powder or turbulence must be the factors.
There is a theory that the sharper shoulder angle improves accuracy and efficiency due to
flame front improvements but it is just theory and the 30o shoulders have proven themselves
in bench rest cartriges as stated.
The only provable thing is that less body taper improves the grip on the chamber lessening
bolt loading. one of the reasons that the "Improved cases" will show less signs of pressure
because the case is not pushed back as hard on the bolt.(It's not much but it does seam to
make a difference).
The down side is it is also harder to extract if loaded hard.
Just an observation
J E CUSTOM