can you tell me about unique like how many grains and do you need a filler?
No filler with any of these loads. Fillers cause more problems than they solve with these kinds of loads, in my experience. And I've not noticed any difference in short-range accuracy using magnum primers, but they don't hurt, either.
With Unique and all the others I listed, I started with 10 grains, worked up to 15, and ended up settling on 12. I've not run it over a chronograph, but it is very mild. Barely supersonic, I'd say. Fun shooter. No recoil. Small-game accurate past 50 yds. Find out what charge your gun likes.