If I might suggest something.......Hodgdon powder has come out with a product called CFE 223. The CFE stands for Copper Fouling Eraser and it is designed to get rid of the copper fouling. I just looked at their website and they do offer loading data for the 22-250 but it is for a 52 grain Hornady A-max bullet, but 1 grain shouldn't make any difference in the load.
I bought a pound of it to try a load with .223 in my Wetherby rifle. The bore of that rifle looks a tremendous amount better than it did before I started using CFE 223. I also found that it is a good shooting powder (accuracy) as well as cleaning the bore. I am going to use it for loading all of my .223 and .308 ammo from now on.
Here is the Hodgdon page that tells about the powder: http://www.hodgdon.com/new_prod.html