Originally Posted by RDM416
The chart in wikipedia shows 6.5" SD at 1000 yards. That corresponds to what I seem to be seeing in actual range results.
I have an engineering background and am starting to dig more into the science behind all this.
When I dial in the correction my groups are more centered around my POA.
But in the mean time, I am going to dial in what my ballistic program shows for spin drift.
'Roger that' on all four of the above sentences. Except for the second sentence. The researching part is past-tense for me.
I'm experiencing about the same SD at 1000 yds. Between SD and Coriolis-caused drift (60.5 degrees North Latitude), I typically experience about 10" rightward bullet drift over 1000 yds. Which is very close to the predicted dope using LoadBase 3.0 ballistic software.
I noted this drift the very first time I moved back to 1000 yds about 3 years ago - before I owned any ballistic software. So I didn't experience the drift because I knew it was expected. Quite the contrary. AFTER experiencing this unexplained drift, I spent a lot of time researching the cause(s) of this rightward drift. Now I believe I understand it, and dope for it on all shots past ~5-600 yards.