I've recently been experimenting with this powder for 6.5 Grendel , but found it's great for 223 69gr too. In my 223 20" barrel 1-9” bolt action I'm getting 2925 with this alliant Power pro varmint (100fps faster than Varget) . Looks like it's in the same burn rate as the old alliant Reloder 12 . Another plus is it's $20 a pound . It's Much slower burning than the name implies . Anybody else using/used this powder .