I believe the point he was trying to make was certain cartridges don't even have 1 caliber worth of neck available (like the 3 mentioned so far) and there are plenty of examples of accurate arms chambered for those cartridges.
Pretty much it.
I have a 700 Classic in 300 Savage that's a super shooter, and no matter the loading procedure there's only about .2" of neck to work with.
