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[steyrman]

Sorry for the delay lads
.243
90g
b.c. 0.333
m.v. at 100yds 3100fps 300yds 2285 fps
scope height 6cm centre of barrel to centre of scope

[kennyc]

Sorry for the delay lads
.243
90g
b.c. 0.333
m.v. at 100yds 3100fps 300yds 2285 fps
scope height 6cm centre of barrel to centre of scope

your original drop of 12.5" at 300 from a 150 zero looks all wrong are you sure of that? (I am assuming that the drop is the adjustment from 150 to 300 )
or play with this

[enfield2band]

Your figures do not seem right.

Zeroed at 100 yards I would expect a drop of only about 6 inches at 300 yards.

[Tony1954]

Hi where did you get your velocity fps from are they book or actual measured. tony

[steyrman]

All of the ppu ammo site ?

[Tony1954]

In my opinion the printed fps are meaningless other than in the test rifle at prof house. A chrono is required to get fps from your rifle then calculations can be done. Atb Tony

[tacfoley]

From the Prvi Partizan website.

243 Winchester SP 5.80 g (90 gr)

0 50 100 150 200 250 300
Velocity [m/s] 945 889 835 783 734 686 640
Energy [J] 2603 2304 2033 1789 1569 1371 1192
Trajectory [cm] -5 - 0.1 1.7 0 -5.6 -15.9 -31.5

As you can see, the 90gr bullet only drops a bit over 12" at 330 yards, as you noted. The bullet is NOT zero'ed at 150m, but that is the point blank impact point where the bullet first crosses the line of sight in its trajectory from the muzzle. You'll need to use the link posted by kennyc to do the real math.

tac