Willy, open up the neck on one of yours, seat it LONG and LIGHTLY chamber the round (without powder and primer) and check for engagement to the lands.
I personally like to load .003 off the lands with the Lee FCD to follow things up with a little snuggie. I checked my Marlin xs7 like this and if i seated the bullets right at the lands, I was 2.812. My last run of VERY accurate ammo is actually 2.800 using SGK 165's which are a little slimmer than the Hornady 3031 150gr's i was using prior. Every rifle is different and if you need to double check your own chamber this is the quickest cheapest way to go.
caution though, many .308 magazines won't fit bullets longer than 2.810"
Feral Cats are God's version of Ballistic Gelatin. - anonymous from another forum
my book shows a C.O.L of 2.735 with a 150 gr sst in a win 308.. but yes i'd seat one in a dummy round paint the bullet with black marker and chamber it. i'd run it against the lands and back off a couple thousandth.
Thank you,Shade Mt.The C.O.L.,of 2.735,takes the bullet to the cannalure,into the 308 case.
I have a Stoney Point bullet comparator[now sold by Hornady],i've been using for 15 years.
My old Remy,likes a col of 2.800,with regular bullets,so we will see?