The Hornady Black comes with a 100 V-Max or GMX bullet. The V-Max is a varmint bullet and is not suitable for deer. The GMX is a solid copper bullet(so is the Remington 120. Other forums say it's good for deer.) that is OK for deer at under 100 yards(that applies to all .300 BO ammo. Including the Winchester 150. Not enough energy past there.) The Winchester 150 will do nicely, but it'll also have more felt recoil.
"...3 inches low and 1.5 inches to the right..." That doesn't matter while you're checking ammo. Only the group size matters when doing that. You'll be sighting in anyway.
It's best to use the most accurate ammo. So sight in with whichever brand gives the best accuracy at 100.
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