I dont know if you interpreted my "if - then" statement, since I did not insert the "then", I meant that by comparison, if the 30-30 was a prime canditate to utilize the 26"barrel lenght, then the 30-06 should be a prime candidate to utilyze longer yet, and so on and so on up to the silliest magno bucket of powder behind a 30 cal bullet. Im not proposing anyone use 30 inch barrels. I agree the 45-70 is not a good candidate to required the very long barrel with todays loading practices.
My comment about cutting the barrel is because that is the only way to remove variances of all things other than the barrel length itself from the statistical evaluation. 2 same make guns, equal barrel length, same box of ammo can result in 50-100 fps differences, not to mention each individual spread with no changes in test parameters.
I think we are not in dissagreement with the principles, and I am a proponent of HR/NEF standardizing at 24 inch barrels, and dropping the 22 altogether except for the rifles they want to for specialty puposes - light weight/ youth/etc. THey look kind of squatty with a 22" barrel.