You guys are looking for something that simply doesn't and can't exist. There are just way to many variables involved. And again, the definition of "optimal" is going to change depending on what you're after (accuracy, velocity, handling, sight radius, etc).


Why do you think that when these writers do their tests to determine the "optimal barrel length" for a given cartridge they stick with the same load? It's simple, doing so greatly reduces the number of variables in the question. However, in doing so they also make the results all but pointless because all they have done is determined the optimal barrel length for that specific load in that specific barrel. Change the barrel, powder type or charge weight, or the bullet brand/type/weight and that "optimal length barrel" is no longer optimal for the new combination.

One could literally spend a lifetime and several fortunes on barrels, ammo and reloading components trying to find the definitive optimal barrel length for a given cartridge and never come to a definite conclusion. For starters they would die before they had enough time to fully test all the possibilities. Secondly, each and every barrel is a unique animal unto itself so just when you think you're getting somewhere you shoot out a barrel and have to replace it and start over from scratch. Hamster meets wheel.