Just some data for you. Same ammo in a 16" vs 19" of mine. Only a 50fps difference and that equates to a 30yrd gain in the 19" before a 175 smk goes transonic. Unless that little bit makes a difference for you I'd personally keep the 16.5.This may not be the thread for it (if not, I’ll Move it), but would anyone trade their 18” 308 AT barrel for my 16.5” bartlein WINTAC?