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Author Topic: 309 JDJ Trajectories?  (Read 513 times)

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Offline Minnesota1

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309 JDJ Trajectories?
« on: November 12, 2010, 03:30:21 PM »
I have a 14" Thompson rechamber by ssk industries to 309 JDJ w/hunter style barrel and am loading 52 gr of IMR 4350 with 165 gr. Nosler BT's.  I can't seem to find the ball park trajectories for various ranges.  Does anyone have them?

Thanks.

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Offline Ken ONeill

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Re: 309 JDJ Trajectories?
« Reply #1 on: November 13, 2010, 02:48:39 AM »
My load runs a 165 Nos. BT @2400fps. For my use, I sight it in 1 3/4" high @ 100 yds, which results in a dead on zero @ 150 yds., 1" low @ 175 yds., and 4" low @ 225 yds.
Try your load in your gun @ each distance to see what works for you.

P.S. If your load is in a Contender, and not an Encore, it sounds like a frame stretcher to me, FWIW.
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Offline Jay HHI6818

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Re: 309 JDJ Trajectories?
« Reply #2 on: November 13, 2010, 01:33:24 PM »
I ran the numbers 165 Nosler BT @ 2300 FPS with a 200 yd zero. Almost 2000 Ft/lbs of energy @ 200 yds.

Trajectory for Nosler .308 dia. 165 gr. Ballistic Tip at 2300 Feet per Second
At an Elevation Angle of: 0 degrees
Ballistic Coefficients of: 0.475   0.475   0.475   0.475   0.475
Wind Direction is: 9.0 o'clock and a Wind Velocity of: 10.0 Miles per hour
Altitude: 1100 Feet   Humidity: 78 Percent   Pressure: 29.53 in/Hg


Range   Velocity   Energy   Momentum   Drop         Bullet Path   Wind Drift   Time of Flight
(Yards)   (Ft/Sec)   (Ft/Lbs)   (Lb-Sec)   (inches)   (inches)   (inches)   (Seconds)
0           2300.0   1937.8   1.69             0.0            -1.5             0.0           0.000000000
50           2212.2   1792.6   1.62            -0.62     0.96            -0.23   0.066500263
100           2126.2   1656.0   1.56            -2.54     2.11            -0.92   0.135664678
150           2042.1   1527.6   1.50            -5.89     1.83            -2.11   0.207651418
200           1959.9   1407.1   1.44            -10.8      0.0            -3.83   0.282630508
250           1879.7   1294.3   1.38            -17.41   -3.54            -6.11   0.360782230
300           1801.5   1188.8   1.32            -25.89   -8.94            -8.97   0.442298055
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Offline Gswag

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Re: 309 JDJ Trajectories?
« Reply #3 on: November 13, 2010, 02:15:21 PM »
Ken's numbers for trajectory are dead on as I would have expected due to the fact he has been hunting with this caliber for years sucessfully.  I just ran them through the computer just to see what yours should be and they will be close to Ken's IN THEORY from a computer program.  You need to shoot them in your gun to make sure of course.  From the SSK load sheet, the 52 grains of 4350 is a max load for that powder with the 165 and shows a velocity of 2371 fps.  
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