if you are interested in a new powder that is supposed to be as good as Varget..
try out the IMR 8208 XBR. Xtreame Bench Rest (xbr) from the bench guys say that it's temp stable, and very consistent, and meters really well.
I have been waiting for the temps to come down so that i can start working loads up. But, the good news is that it's a new kid on the block so it's on the shelf. Right now all i use is Varget after trying H380 and 4895.
I would also suggest trying the 50gr, or 53vmax, as the BC on the 53 is a lot more than others in that class. I was getting great results from my 22-250 and shocking results in my 223 with the factory loads. I had a 14 twist and it liked the lighter bullets.
I don't chono the loads until i find that sub .5Moa group that I like. Then chono just to find the data chart for my draft drop sheet. I load within the loading ranges and don't care if it's going 3600 or 3900, as long as it's shooting dimes.
One other thing that i feel helps, is a digital scale that measures to the hundredths (.02gr). I found that when i changed to that, my SD dropped to between 10 and 15, which can help to tighten groups up, assuming the bullet and barrel are appropriately matched. So far as i can tell, that is about as low as physics is going to allow.(without spending a fortune to get lower numbers)