In some of my recent research on naval rifles I read of the common practice in years past of making seagoing gun barrels as long as possible thinking that this one factor increased range and accuracy...As scientific study took hold, it was discovered that at some point in each case extra length was detrimental, and actually worked against the desired result...When the guys with the slide rules took over design, efficiency in battle became the watchword at sea, but the beautiful designs on the outside of the barrels disappeared...
One of my go-to sources on ballistics has always been "Hatcher's Notebook"...Some of his research is approaching 100 years old, and still valid......Ben