I use H335 in my 16" AR, it shoots very clean and accurate. I also use a 65gr SGK, I don't really plink with it. I agree with boosted, if you want accuracy you want a heavier bullet! If you can find them, I would take a guess and say the 69gr or 77gr SMK would do well for you. Good luck and have fun! Oh yeah, what primers do you plan on using?
Lock and load, the zombies (democrats) are coming (to take your guns)!