load help for 200grain barns x

[vino]

I recently loaded some new barns x long range bullets for my 300win sendero.
Used RL 22 and wlrm primers.
Well crappy results shots @ 100 yards are 10" to left of poa and then 6" high on second shot and 3 shot did not even hit target.
My barns book dose not have load data for than new bullet it only has data for the standard xlc bullet.
I have some loaded up with mag pro and 7828ssc but have noy shot them yet.

What did i do wrong or is it just a picky gun.
It shoots 185 bergers @.75 moa
210 bergers @.55 moa
180 brans @.75.
Shoots accubonds good but they do not have good results with putting animals down so i do not shoot them any more.
And all 180 grain factory loads well.

 

[dah605]

I'm shooting them with great results. The load I'm using is 70.5 grains of H4831SC with 215M primers in Winchester brass. They seem to shoot a lot better with a big jump in my Cooper. I tried the Barnes recommended seating depths (.030-.070) and they were ok, but not great. I loaded some to the standard length of 3.340" and they shot great. I extended that out a bit to account for throat erosion over time. I think my seating depth is ~.110 from the lands.

-David

 

[vino]

Thanks I will try that . Barns x emailed me back and told me to try different powder and seat them dealer to jump to the lands??