Bullet trajectory comparison


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Gene_WI
March 18, 2008, 08:39 PM
Hi Folks

I am looking for a tool that would allow me to plot bullet trajectories. In particular I want to see a comparisons of 7.62x54R 147 grain, 150 grain .308, and 168 grain .308.

I got a good deal on an IOR 4x scope with a dragunov reticule. The scope is calibrated for 168 grain .308. I want to use it with 7.62x54R with my PSL. I am trying to determine if the bullet drop adjustments on the scope can be used.

Thanx

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litman252
March 18, 2008, 08:54 PM
Gene,
Take a look at these,
http://www.handloads.com/calc/index.html

http://www.handloads.com/calc/recoil.asp

Top one is more for you, bottom one for entertainment.....................

Itching to shoot now that the snow is melting???

Tony

Gene_WI
March 18, 2008, 09:23 PM
I shoot in the snow :)

litman252
March 18, 2008, 10:05 PM
How far from madison do you do your "snow Shooting"??

Tony

elmerfudd
March 18, 2008, 10:54 PM
I'm not sure that that will work very well unless you develop a handload for it. The 7.62x54R is a little more powerful than a .308 and the 24" barrel on a PSL will make full use of that extra power. What's more, the PSL is widely regarded as not being well suited to heavy bullets.

Personally, I would just find a load that the PSL likes and then work out a conversion factor or a ballistics chart in order to use reticle.

boilingleadbath
March 19, 2008, 08:18 AM
The adjustments are probably close enough; I suspect you won't be shooting at 1000 yards with a PSL, and at shorter ranges the discrepancy will be small enough to ignore.

Definition of "shorter ranges" will depend upon how much discrepancy is acceptable.

Running "Remington shoot", with a tad bit of hacking (using .308 bullet data with 7.62 velocities to simulate the Russian cartridge), we find that:
Remington's 168gr .308 round drops 420" at 1000 yards.
150gr swift Sciroccos drop 360" (MV=2953fps) at 1000 yards
150gr FMJ (BC = ~.315, MV=2953fps) drop 470" at 1000 yards.

Drop curves arn't exactly similar, but they are close enough...

Your 'max range' is about:

1000yards*sqrt(max discrepancy in inches/55")

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