For your 300wsm, I'd pick a mid weight bullet designed for penetration with elk being considered first. Any bullet that will kill an elk will kill any mule deer at any sensible range. I would look at 180 gr Barnes TXS, Nosler Partition or one of the core bounded bullets; which ever was the most accurate. I'd bet my favorite A-Bolt that the only time a TXS or Partition ever failed was when the shooter missed the target.
the best performing bullet i've tried is a hornady interlok. they are cheap and perform super good on all kinds of game.
i used a 150 gr on mule deer, whitetail, hogs, antelope and everything under the sun. until i switched to a 150gr barnes tripple shock.
ballistic tips and v-max and g-max bullets DO NOT penetrate efficiently because often, they expand very rapidly and fragment in the body. i have witness this MANY, MANY times. however, these bullets will drop a smaller animal right now! because the fragments do so much damage.
bullets that have great reputations are the swift a-frames, the barnes tsx and trplshock (hollow point) berger vld's, and the nosler partitions.
I don't own a 300 but in my 7mag the barnes tsx has been deadly accurate and has performed extremely well. I have killed animals from coyotes to elk with full expansion on every one and nearly all pass through shots as well. They are not cheap but they will never let you down.
When it comes to scent, there are basically two types; those that attract and those that mask. I've tried both on many occasions. There are lots and lots of "doe in heat" scents, designed to attract a big buck into range. I've also used a "cow in heat" scent while elk hunting.
Another scent would almost be better named as a "coverup smell". The main goal is to cover up human odor or mask it. Though I don't believe you can ever totally eliminate all human...