and the winner is: the .338-06 A-Square!

I get more muzzle velocity out of less powder:

**** Input data:                         Date: 4-Oct-2009     Time: 15:46:16
Cartridge................. = .338-06 A-Square
Projectile type........... = 8.58, 9., Möller 8,5 mm KJG S with boattail
 
Max.avg.pressure(Piezo A-S)= 448 MPa     Shot start / init pressure = 15 MPa
Projectile weight       (g)= 9.007       Groove caliber         (mm)= 8.59
Length of cartridge    (mm)= 84.84       Length of case         (mm)= 63.35 
Case capacity       (cu.cm)= 4.48        Length of projectile   (mm)= 30.48 
Length of barrel       (mm)= 560 
**** Values calculated:
Seating depth          (mm)= 8.99        Volume displaced    (cu.cm)= 0.52 
Comb.chamber volume (cu.cm)= 3.96        Projectile travel      (cm)= 50.56 
**** Input data:
Propellant type........... = ADI AR 2219
Charge weight...........(g)= 3.732       Load density......(g/cu.cm)= 0.942
Heat of Explosion   (kJ/kg)= 4000        Ratio of spec. heats cp/cv =  1.231 
Solid density     (g/cu.cm)= 1.57        Weighting factor...........= 0.50
Burning rate factor Ba(1/s)= 0.67        Pro-/degressivity factor a = 0.4497 
Burning limit ......... z1 = 0.5         Combust.Chamber Vb(m³)= 3.962779E-6
Factor.................. b = 1.6         X-S.Area of Bore A(m²)= 5.695E-5
Bulk density      (g/cu.cm)= 0.950       Projectile mass mp(kg)= 9.007E-3
Loading ratio           (%)= 99.1        Projectile travel x(m)= 5.0563E-1
 
**** Results calculated:
Maximum pressure ........ =  430 MPa     Way of projectile at Pmax =  37.1 mm
Muzzle velocity  ......Ve =  999 m/s     Muzzle pressure .......Pe =  60 MPa
Project. energy at muzzle =  4493 J      Fraction of powder burnt  = 99.7  %
Projectile travel time from 10% Pmax to muzzle = 0.88 ms