SAAMI standard COL is 2.125" to 2.760". This is a spec used by commercial ammunition manufacturers to ensure magazine fit and feed in all SAAMI compliant guns chambered for the round.
I think Unclenick meant to say 2.125" to 2.260"
, not 2.760" The drawing nick linked to shows it as maximum of 2.260".
Unclenick has a ton of great knowledge but he still has human typing fingers.