The treatise here says the difference between a 2.5 inch shell and a 2.75 shell from a 2.5 chambered gun amounts to an increase of 300 -400 (on average) increase in psi, insignificant.
Does that translate at all to 2.75 and 3" shells?
The variables in the equation are a given. Each length shell is loaded to the same configuration.
Take a 2.75 magnum shell at 1500psi with 1 1/8 shot from a 2.75 chamber. That is a standard 3" shell. Is there an increase of pressure if you were to shoot the 3' from the 2.75 chamber?
