This may help for starting out ...

I have a load for the 7WSM with 160 Accubonds that pretty much duplicates the factory Winchester Supreme CXP3 160 grain Accubonds. I had purchased a box of the 160 Accubond Win Supremes just for fun and found that they shot extremely well in a factory Savage model 16 FCSS. I did my best to duplicate the factory load and this is what I came up with.

The load is 69.5 Gr H1000 (110% load ratio!) with Rem 9 1/2M primers seated to COL of 2.82", same overal length as the factory rounds. (seated way into the case and no where near the lands, probably work in a Remmy mag well)

Chrony said they were going 3021 fps from a 24 inch barrel. (Quickload says 3051 fps - 62.9K psi) Published BC of the Nosler 160 Accubond is 0.531.

You could start a bit low and work up to that load ...

-----------------------------------------------------------

So a drop chart (assuming a 160 grain Accubond - BC 0.531) that matches your 200 yd zero and drops 37.8 at 500 yds looks like this:

.284 160 GR AB SP, 2980 ft/sec at muzzle, 200.0 yd zeroed.

Range Height MOA
(yds) (in)
0 -1.50 0.00
100 1.47 -1.41
200 0.00 0.00
300 -6.57 2.09
400 -18.91 4.51
500 -37.87 7.23
600 -64.52 10.27
with clicks as follows:

Range (yd) Clicks

--------- ------

0 0
100 -6
200 0
300 8
400 18
500 29
600 41
PS, the velocity that matched your drop (assuming a 160 grain Accubond - BC 0.531) is 2980 fps.

The published Winchester Supreme 7mm WSM Product Symbol: S7MMWSMCT drop chart can be found at:

Centerfire Rifle