Thread: 16.5 308 Recipe

Case capacity and propellant properties may vary considerably from lot to lot!


**** Input data: Date: 31-Jan-2015 Time: 13:12:07
Cartridge................. = .308 Win. (SAAMI)
Projectile type........... = .308, 208, Hornady A-MAX 30712 with boattail


Max.avg.pressure(Piezo SAA)= 62000 psi Shot start / init pressure = 3626 psi
Projectile weight (gr)= 208 Groove caliber (in)= 0.308
Length of cartridge (in)= 2.800 Length of case (in)= 2.014
Case capacity(Grains Water)= 56.00 Length of projectile (in)= 1.340
Length of barrel (in)= 24.000
**** Values calculated:
Seating depth (in)= 0.554 Volume displaced (gn H2O)= 10.05
Comb.chamber volume(gn H2O)= 45.95 Projectile travel (in)= 22.540
**** Input data:
Propellant type........... = ADI AR 2206H
Charge weight..........(gr)= 46.0 Load density......(g/cu.cm)= 0.999
Heat of Explosion (cal/lb)= 439862 Ratio of spec. heats cp/cv = 1.234
Solid density (gr/cu.in)= 409.7 Weighting factor...........= 0.5
Burning rate factor Ba(1/s)= 0.558 Pro-/degressivity factor a = 1.456
Burning limit ......... z1 = 0.4 Combust.Chamber Vb(ft³)= 1.053409E-4
Factor.................. b = 1.544 X-S.Area of Bore A(ft²)= 5.114126E-4
Bulk density (gr/cu.in)= 232.7 Projectile mass mp (lb)= 2.97134E-2
Loading ratio (%)= 108.6 Projectile travel x(ft)= 1.878346E+0


**** Results calculated:
Maximum pressure ........ =90098 psi Way of projectile at Pmax = 1.01 in
Muzzle velocity ......Ve = 2746 fps Muzzle pressure .......Pe = 7400 psi
Project. energy at muzzle = 3483 ft.lbs Fraction of powder burnt = 100 %
Projectile travel time from 10% Pmax to muzzle = 1.07 ms


D A N G E R: Load exceeds Maximum Average Pressure ! DO NOT USE THIS LOAD !
Real maximum of pressure inside barrel.
End of combustion before the projectile passes muzzle.