SemperFi....thats exactly what I am talkin about. 2.939" thats crazy. I use Lapua brass, 168gr. A-Max, varget and BR2s. Now there is more than one way to skin a cat....1) you can seat the bullet close to the lands .100" or closer and deal with runout issues, or 2) you can seat to mag lenght (2.813" to 2.815") and deal with possible jump issues, especially when you get throat erosion problems. I have found through the years the cartridge's max consistancy is when the bullet is seated to where the bearing surface and boat-tail meet is exactly the point where the case neck meets the shoulder. So with what I use (168gr. A-Max) that would be 2.850". The most important thing I think any of us can do as reloaders is finding the optimum charge weight with whatever powder we decide to use. To really ring out the accuracy neck size only and only bump shoulder when the bolt gets a little "stiff". Of course all of what I have mentioned is SPS Tac. .308 specific, and I am sure there are a few others this holds true with also. If you use A-Maxs or similiar bullets, try 2.850" OAL and see what happens. That would put you @approx. .099" jump, which seems crazy far, and I'll bet you shoot tighter groups.....