No two guys share the same opinions on everything. Very few rifles favor exact loads. All the powders listed above are excellent choices. I find when working a new load, I choose one powder and the bullet weight I want. I then work loads,,changing powder weights,, changing bullet brands,, cahnging primers, etc to get the desired results. If that don't work, I try a different powder and go throught those same steps. I think many change to many of the above variables at one time and then it gets to be difficult to find "the load". Changing only one thing at a time works for me. After typing all this: I am sure that I am not telling any of you anything you do not already know. please forgive me. It's two o-clock in the morning and I can't sleep, so I gotta write something! The election results caused my lack of sleep! I am so ****** at our new president elect results!