175 TMK not the SMK..... Has a BC stated of .543 and that can be achieved at only 2400 fps. As for powder I liked 4046 over RL-15. But currently use xbr 8208 and it shoots really extremely well from both the 20" SPS Tac and the 26" SPS Varmint. Both are .308 Win rifles.
What part of Cali?