Thread: Barrel length measuring and discrepancies?

So am I a muppet or missing something? My understanding is barrel length is measured from muzzle to bolt face (obviously with action/bolt closed). Out of curiosity measured a few of my rifle barrels - Tikka T3 223 22" as expected from factory specs. Kimber Montana 308 19.5" (spec 22"), Ruger RPR Gen 2 308 18" (spec 20"), Bergara TD 308 (marked 16.5" on box) measured 14"!!!!!?
Any explanations (these rifles are as from factory no gunsmithing/threading or recrowning).??
Helps explain why the Bergara seems so handy LOL!
Cheers, Charlie