Have yet to try the 85gr HPBT on deer myself, have a few loaded up and they shoot same POI as the 75gr HP. I have some 105gr round nose Speer loaded up for fun too, but need to see how they print paper first. I ended up with a lot of 6mm projectiles from a deceased estate, so no running out in a hurry. I would think you are spot on with your comments with the 85gr SPT Sierra, bit of extra lead up front and a thinner jacket I'd imagine.
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