Why not shorter than 160 for 6.5 CM?
Preferred Barrels published a comparison with diff FB and diff bullets and 150 seemed to be best performing.
I have two rifles in 6.5 CM and both are SAAMI and yes, closest I can get when new is about .080” to lands due to max mag length w binder plate (and I do take an added .010” off CBTO to ensure fitting mag length given variation in bullet length).
And my max mag length reloads are longer by a good bit over any factory ammo I have measured.
I was thinking about 150 FB in next barrel to give me more room to explore seating depth tuning. I shoot Berger 140 HT and 140 ELD-M.
So why 160?