Quote Originally Posted by JB101 View Post
As far as I can find out sp8 was developed for 9mm
There is not a lot of info on Sp9 for 223 that I could find🙁

I would suggest staying with a more known powder for 223 such as N140 as there is a lot more info on that available.
I am very limited as to which powders I can get, the N130/133/140 are all out, I can get Vectan SP7 in a 2kg tub only or tu3000 in 2kg or 500g which would be better for testing