Anyone have any experience with Alliant's new double base spherical Power Pro 1200-R? It is supposed to be similar in burning rate to their Reloder 10x. Since most of the usual suspects for loading .223 ammo have disappeared, I went ahead and ordered a pair of 8 lb kegs of it. At least it is made in the USA. I am guessing it is close to Accurate 2200 as well. Hoping that someone has tried it and would appreciate any comments.