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[zolli96]

Quickload nokren som vil .

Kule Lapua mega 180grains 308w.

Hylse S&B

Tennhette Fedaral 210

VV 150 44,2 GRAINS

COL 68,38

Brno ca 51 cm løp.

[Ricki]

Du mener kanskje 185gr kule?

 

**** Input data: Date: 8-jun-2015 Time: 16:07:42

Cartridge................. = .308 Win. (SAAMI)

Projectile type........... = .308, 185, Lapua MEGA E415 7213 with flatbase

 

Max.avg.pressure(Piezo SAA)= 62000 psi Shot start / init pressure = 3626 psi

Projectile weight (gr)= 185 Groove caliber (in)= 0,308

Length of cartridge (in)= 2,692 Length of case (in)= 2,014

Case capacity(Grains Water)= 56,00 Length of projectile (in)= 1,126

Length of barrel (in)= 20,079

**** Values calculated:

Seating depth (in)= 0,448 Volume displaced (gn H2O)= 8,44

Comb.chamber volume(gn H2O)= 47,56 Projectile travel (in)= 18,513

**** Input data:

Propellant type........... = Vihtavuori N150

Charge weight..........(gr)= 44,2 Load density......(g/cu.cm)= 0,927

Heat of Explosion (cal/lb)= 409527 Ratio of spec. heats cp/cv = 1,218

Solid density (gr/cu.in)= 394,5 Weighting factor...........= 0,5

Burning rate factor Ba(1/s)= 0,545 Pro-/degressivity factor a = 1,407

Burning limit ......... z1 = 0,5 Combust.Chamber Vb(ft³)= 1,090349E-4

Factor.................. b = 1,742 X-S.Area of Bore A(ft²)= 5,114101E-4

Bulk density (gr/cu.in)= 219,5 Projectile mass mp (lb)= 2,642857E-2

Loading ratio (%)= 106.9 Projectile travel x(ft)= 1,542749E+0

 

**** Results calculated:

Maximum pressure ........ = 53685 psi Way of projectile at Pmax = 1,38 in

Muzzle velocity ......Ve = 2433 fps Muzzle pressure .......Pe = 8495 psi

Project. energy at muzzle = 2432 ft.lbs Fraction of powder burnt = 99,6 %

Projectile travel time from 10% Pmax to muzzle = 1,13 ms

 

Real maximum of pressure inside barrel.

End of combustion after the projectile passes muzzle.