I forgot to mention that the finished length of the round is 2.950"; disregard my "P4" to you. I broke out my diary and took a look. Don't get wound around the axle on this as specs. in loading manuals show National Match specs. of 2.810" good for an M-14 or M1A but not so good for H/R; those do not take into the equation the rather generous freebore which is a design characteristic of H/R weapons. When you build your round, build a "dummy" lay it by and keep it for reference. Seat the bullet and wash the ogive with a black Sharpie or Prussian Blue, seat and "reseat" the round until the lands "do not" bite into the guilding metal of the jacket. With Sierra Matchings [168] that comes out to 2.910", with Hornady A-Maxs [168] that comes out to 2.950" due to its longer and gentler ogive. Either bullet will give you very satisfactory groupings.
I will cose out here with a disclaimer of sorts. All of the foregoing is a historical recital of what I did with my 308Ultra and not yours, and is representative of my own working method and rifle practice; it is not a general recommendation for all other situations. Take all of the foregoings and treat "it all" with tenderness and objectivity.
Anchor's Away/SemperFi
CPO Bull
PS; Keep in touch shipmate and let me know how it goes.