Yup, bullet choice for hunting with the .300 blk is limited. That being said, I've had plenty of good experiences with my hunting loads (granted, they aren't subsonic). Great expansion and performance from dead right there to a 50 yd run. There are loads that work fantastic, and it certainly doesn't take a 300 win-mag to ethically down a white tail. Who knows, I might pick up a box of the Noslers mentioned above, see if they expand, and work something up for next year.
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Then, when deer season is up, 20 clicks on the eotech and I'm back to super duper quiet shooting with cheap subsonic loads.
300blk may not be the most powerful, or have the widest choice in good hunting bullets, but it's a remarkably versatile round that is cheap to get into. No special bolt, no special magzine, brass is easily made from .223/5.56, lots of good cast bullets for plinking, and I send them down the same can as my .308. Hell, I even use the same powder that I put in my .41 magnum.
YMMV, but for me it was the right choice. Just have to understand the limitations of the round to enjoy the benefits.