The .338 Federal is a nice "against the trend" development by Federal. All tests seem to agree that it is quite a deadly little cartridge, which is basically a necked up .308 Winchester. I had a few doubts about usability with KJG, which demands rather high speeds, but it looks good:
**** Input data: Date: 17-Sep-2009 Time: 01:21:09
Cartridge................. = .338 Federal
Projectile type........... = 8.58, 9., Möller 8,5 mm KJG S with boattail
Max.avg.pressure(Piezo Wil)= 415 MPa Shot start / init pressure = 15 MPa
Projectile weight (g)= 9.01 Groove caliber (mm)= 8.59
Length of cartridge (mm)= 71.12 Length of case (mm)= 51.16
Case capacity (cu.cm)= 3.73 Length of projectile (mm)= 30.48
Length of barrel (mm)= 560
**** Values calculated:
Seating depth (mm)= 10.52 Volume displaced (cu.cm)= 0.61
Comb.chamber volume (cu.cm)= 3.13 Projectile travel (cm)= 51.94
**** Input data:
Propellant type........... = Nitrochemie A/S 0300
Charge weight...........(g)= 3.04 Load density......(g/cu.cm)= 0.972
Heat of Explosion (kJ/kg)= 3950 Ratio of spec. heats cp/cv = 1.2401
Solid density (g/cu.cm)= 1.62 Weighting factor...........= 0.50
Burning rate factor Ba(1/s)= 0.675 Pro-/degressivity factor a = 0.94
Burning limit ......... z1 = 0.5 Combust.Chamber Vb(m³)= 3.126347E-6
Factor.................. b = 1.7 X-S.Area of Bore A(m²)= 5.695021E-5
Bulk density (g/cu.cm)= 0.944 Projectile mass mp(kg)= 9.007E-3
Loading ratio (%)= 103.0 Projectile travel x(m)= 5.1936E-1
**** Results calculated:
Maximum pressure ........ = 400 MPa Way of projectile at Pmax = 32.7 mm
Muzzle velocity ......Ve = 949 m/s Muzzle pressure .......Pe = 48 MPa
Project. energy at muzzle = 4053 J Fraction of powder burnt = 99.8 %
Projectile travel time from 10% Pmax to muzzle = 0.92 ms
This looks like a nice starting load for this cartridge and it only slows down to < 750 m/s beyond 225 m which strikes me as OK. The BC of the short 8.5mm KJG are not overwhelming but still the ballistics look sufficient. Wants!
**** Input data: Date: 17-Sep-2009 Time: 01:21:09
Cartridge................. = .338 Federal
Projectile type........... = 8.58, 9., Möller 8,5 mm KJG S with boattail
Max.avg.pressure(Piezo Wil)= 415 MPa Shot start / init pressure = 15 MPa
Projectile weight (g)= 9.01 Groove caliber (mm)= 8.59
Length of cartridge (mm)= 71.12 Length of case (mm)= 51.16
Case capacity (cu.cm)= 3.73 Length of projectile (mm)= 30.48
Length of barrel (mm)= 560
**** Values calculated:
Seating depth (mm)= 10.52 Volume displaced (cu.cm)= 0.61
Comb.chamber volume (cu.cm)= 3.13 Projectile travel (cm)= 51.94
**** Input data:
Propellant type........... = Nitrochemie A/S 0300
Charge weight...........(g)= 3.04 Load density......(g/cu.cm)= 0.972
Heat of Explosion (kJ/kg)= 3950 Ratio of spec. heats cp/cv = 1.2401
Solid density (g/cu.cm)= 1.62 Weighting factor...........= 0.50
Burning rate factor Ba(1/s)= 0.675 Pro-/degressivity factor a = 0.94
Burning limit ......... z1 = 0.5 Combust.Chamber Vb(m³)= 3.126347E-6
Factor.................. b = 1.7 X-S.Area of Bore A(m²)= 5.695021E-5
Bulk density (g/cu.cm)= 0.944 Projectile mass mp(kg)= 9.007E-3
Loading ratio (%)= 103.0 Projectile travel x(m)= 5.1936E-1
**** Results calculated:
Maximum pressure ........ = 400 MPa Way of projectile at Pmax = 32.7 mm
Muzzle velocity ......Ve = 949 m/s Muzzle pressure .......Pe = 48 MPa
Project. energy at muzzle = 4053 J Fraction of powder burnt = 99.8 %
Projectile travel time from 10% Pmax to muzzle = 0.92 ms
This looks like a nice starting load for this cartridge and it only slows down to < 750 m/s beyond 225 m which strikes me as OK. The BC of the short 8.5mm KJG are not overwhelming but still the ballistics look sufficient. Wants!
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