Thread: 308 barrel length velocity loss

Hi folks.

So my beloved 308 is currently a 20".

I'm getting 2680fps with 168gr TMK.

I love it the way it is but I can't help thinking if I lopped 4 inches off how much handier it would be.

Realistically I keep most of my general hunting sub 300y but I'd like it to be able to still give a red a solid tickle at 475y which isn't a hard shot with this old vanguard of mine.

So the question is what sort of velocity loss would one expect going from 20" to 16"?