Xtream plated 165s are what I am loading. They are the only source for 165s that I know of, they work well for what we use them for.
Your 5.45 loads sound fun working up.
The 5.45 is fun. The hardest part is catching the brass for inspection. The loads are being developed in a full size Bulgarian AK74. It threw the really really soft loaded brass about 10 feet. The hot stuff is going into orbit. Gotta have a buddy with a hat over the ejection port!
At about 20gr of IMR4198 I was just starting to flatten primers and about 2900FPS. I'm hoping the CFE will get me about 2700FPS with the 60gr projectile. Then I will start figuring out a swage. Plan to use 223 projectiles since they are very close to the same size. .224 vs .2215. I'll probably have to machine a swaging die.