The fact that any kind of load that achieves decent speeds for the KJG leads to compressed loads in .338 Federal led me to looking for other options. Now I don't want a Magnum for 2 reasons.
1) I don't see any reason. I am not likely to shoot much further than 200m, so why would I need a Magnum?
2) I have found a full length moderator that basically looks like thicker barrel and has a diamter of 25mm, ie looks like a match barrel. This moderator at the moment can use a maximum of 30-06 Ackeley Improved, so I am hoping that the .338-06 will be usable. As that moderator involves drilling holes into the last 1.5" (make that 38mm) of the barrel the usable length goes down to 20.5", ie 520mm. Quickload still recommends Nitrochemie A/S 0300, so that is what I am using here.
**** Input data: Date: 26-Sep-2009 Time: 23:03:18
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)= 9.01 Groove calibre (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)= 520.7
**** Values calculated:
Seating depth (mm)= 8.99 Volume displaced (cu.cm)= 0.52
Comb.chamber volume (cu.cm)= 3.96 Projectile travel (cm)= 46.63
**** Input data:
Propellant type........... = Nitrochemie A/S 0300
Charge weight...........(g)= 3.592 Load density......(g/cu.cm)= 0.907
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)= 3.962196E-6
Factor.................. b = 1.7 X-S.Area of Bore A(m²)= 5.695E-5
Bulk density (g/cu.cm)= 0.944 Projectile mass mp (kg)= 9.007E-3
Loading ratio (%)= 96.0 Projectile travel x (m)= 4.6634E-1
**** Results calculated:
Maximum pressure ........ = 420 MPa Way of projectile at Pmax= 41.4 mm
Muzzle velocity ...... Ve = 981m/s Muzzle pressure .......Pe= 64 MPa
Project. energy at muzzle = 4336J Fraction of powder burnt = 100 %
Projectile travel time from 10% Pmax to muzzle = 0.85 ms
KJG needs at least 750 m/s to open properly, so that needs to be achieved at whatever range one intends to hit. As the below ballistics table shows, this lets me do that to slightly beyond 250m:
Muzzle velocity : 981 m/s
Crosswind speed : 0 m/s
Ballistic Coefficient(s) (G1):
C1=0.362@V>800 m/s;
C2=0.307@V>400 m/s;
C3=0.335@V>340 m/s;
C4=0.272@V>300 m/s;
C5=0.253@V>0 m/s;
Optimum trajectory information :
Optimum sight-in range (X) = 190 m
with max. ordinate above LOS at range (M)= 113 m
and max. point blank range (P)= 220 m.
-------------------------------------------------------------------------------------
Sight-in clicks, 1 click = 1.0 cm/100 m or 0.394 in/100 m
Height of sight above bore axis = 3.6 cm or 1.417 inch
Gun is zeroed-in at 200 m,
by sighting-in at level firing
-------------------------------------------------------------------------------------
Range Velo Time of Energy Path Deflection Total Sight correction Target
city flight to at crosswind drop for setting new lead
LOS of 0.5 m/s zero range 10 m/s
-------------------------------------------------------------------------------------
·Meter m/s s Joule cm cm MOA cm Clicks MOA m ·
-------------------------------------------------------------------------------------
| 0 981 0.0000 4336 -3.6 0.0 ----- 0.0 ------ ----- 0.00
| 25 958 0.0258 4132 -0.6 0.0 0.02 0.3 +2.2 +0.76 0.26
| 50 935 0.0522 3936 +1.8 0.1 0.04 1.3 -3.6 -1.25 0.52
| 75 912 0.0792 3749 +3.5 0.1 0.06 3.0 -4.7 -1.61 0.79
| 100 890 0.1069 3569 +4.5 0.2 0.08 5.4 -4.5 -1.53 1.07
M 118 874 0.1273 3444 +4.7 0.3 0.09 7.6 -3.9 -1.36 1.27
| 125 868 0.1353 3396 +4.6 0.4 0.10 8.6 -3.7 -1.27 1.35
| 150 847 0.1646 3231 +4.0 0.5 0.12 12.7 -2.6 -0.91 1.65
| 175 826 0.1947 3072 +2.4 0.7 0.14 17.6 -1.4 -0.48 1.95
X 200 805 0.2255 2919 0.0 1.0 0.17 23.4 0.0 0.00 2.25
| 225 782 0.2570 2754 -3.3 1.2 0.19 30.1 +1.5 +0.51 2.57
P 229 778 0.2621 2727 -4.0 1.3 0.19 31.2 +1.7 +0.59 2.62
| 250 758 0.2892 2590 -7.6 1.6 0.21 37.7 +3.0 +1.05 2.89
| 275 735 0.3224 2433 -12.9 1.9 0.24 46.4 +4.7 +1.62 3.22
| 300 712 0.3570 2283 -19.5 2.3 0.27 56.3 +6.5 +2.23 3.57
-------------------------------------------------------------------------------------
M = Peak vs. L.O.S, X = Set Zero, P = Max. Point Blank Range
Elevation above Angle of Site (0.0 deg.) = 0.0772 deg.
1) I don't see any reason. I am not likely to shoot much further than 200m, so why would I need a Magnum?
2) I have found a full length moderator that basically looks like thicker barrel and has a diamter of 25mm, ie looks like a match barrel. This moderator at the moment can use a maximum of 30-06 Ackeley Improved, so I am hoping that the .338-06 will be usable. As that moderator involves drilling holes into the last 1.5" (make that 38mm) of the barrel the usable length goes down to 20.5", ie 520mm. Quickload still recommends Nitrochemie A/S 0300, so that is what I am using here.
**** Input data: Date: 26-Sep-2009 Time: 23:03:18
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)= 9.01 Groove calibre (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)= 520.7
**** Values calculated:
Seating depth (mm)= 8.99 Volume displaced (cu.cm)= 0.52
Comb.chamber volume (cu.cm)= 3.96 Projectile travel (cm)= 46.63
**** Input data:
Propellant type........... = Nitrochemie A/S 0300
Charge weight...........(g)= 3.592 Load density......(g/cu.cm)= 0.907
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)= 3.962196E-6
Factor.................. b = 1.7 X-S.Area of Bore A(m²)= 5.695E-5
Bulk density (g/cu.cm)= 0.944 Projectile mass mp (kg)= 9.007E-3
Loading ratio (%)= 96.0 Projectile travel x (m)= 4.6634E-1
**** Results calculated:
Maximum pressure ........ = 420 MPa Way of projectile at Pmax= 41.4 mm
Muzzle velocity ...... Ve = 981m/s Muzzle pressure .......Pe= 64 MPa
Project. energy at muzzle = 4336J Fraction of powder burnt = 100 %
Projectile travel time from 10% Pmax to muzzle = 0.85 ms
KJG needs at least 750 m/s to open properly, so that needs to be achieved at whatever range one intends to hit. As the below ballistics table shows, this lets me do that to slightly beyond 250m:
Muzzle velocity : 981 m/s
Crosswind speed : 0 m/s
Ballistic Coefficient(s) (G1):
C1=0.362@V>800 m/s;
C2=0.307@V>400 m/s;
C3=0.335@V>340 m/s;
C4=0.272@V>300 m/s;
C5=0.253@V>0 m/s;
Optimum trajectory information :
Optimum sight-in range (X) = 190 m
with max. ordinate above LOS at range (M)= 113 m
and max. point blank range (P)= 220 m.
-------------------------------------------------------------------------------------
Sight-in clicks, 1 click = 1.0 cm/100 m or 0.394 in/100 m
Height of sight above bore axis = 3.6 cm or 1.417 inch
Gun is zeroed-in at 200 m,
by sighting-in at level firing
-------------------------------------------------------------------------------------
Range Velo Time of Energy Path Deflection Total Sight correction Target
city flight to at crosswind drop for setting new lead
LOS of 0.5 m/s zero range 10 m/s
-------------------------------------------------------------------------------------
·Meter m/s s Joule cm cm MOA cm Clicks MOA m ·
-------------------------------------------------------------------------------------
| 0 981 0.0000 4336 -3.6 0.0 ----- 0.0 ------ ----- 0.00
| 25 958 0.0258 4132 -0.6 0.0 0.02 0.3 +2.2 +0.76 0.26
| 50 935 0.0522 3936 +1.8 0.1 0.04 1.3 -3.6 -1.25 0.52
| 75 912 0.0792 3749 +3.5 0.1 0.06 3.0 -4.7 -1.61 0.79
| 100 890 0.1069 3569 +4.5 0.2 0.08 5.4 -4.5 -1.53 1.07
M 118 874 0.1273 3444 +4.7 0.3 0.09 7.6 -3.9 -1.36 1.27
| 125 868 0.1353 3396 +4.6 0.4 0.10 8.6 -3.7 -1.27 1.35
| 150 847 0.1646 3231 +4.0 0.5 0.12 12.7 -2.6 -0.91 1.65
| 175 826 0.1947 3072 +2.4 0.7 0.14 17.6 -1.4 -0.48 1.95
X 200 805 0.2255 2919 0.0 1.0 0.17 23.4 0.0 0.00 2.25
| 225 782 0.2570 2754 -3.3 1.2 0.19 30.1 +1.5 +0.51 2.57
P 229 778 0.2621 2727 -4.0 1.3 0.19 31.2 +1.7 +0.59 2.62
| 250 758 0.2892 2590 -7.6 1.6 0.21 37.7 +3.0 +1.05 2.89
| 275 735 0.3224 2433 -12.9 1.9 0.24 46.4 +4.7 +1.62 3.22
| 300 712 0.3570 2283 -19.5 2.3 0.27 56.3 +6.5 +2.23 3.57
-------------------------------------------------------------------------------------
M = Peak vs. L.O.S, X = Set Zero, P = Max. Point Blank Range
Elevation above Angle of Site (0.0 deg.) = 0.0772 deg.
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