I hit one of my deer at 380 yards head on thru the chest found the bullet back near his "man parts" while I was cleaning him. It had fully expanded. That is strange that yours did not open up. The velocity difference should not have made that big of a difference? My bullet did go thru more soft tissue that may have helped.
Did you recover the bullet? Did it have and exit? you say a "pin prick" I am curious what you mean
I had a similar problem with Nosler Partitions, I had an elk stand up at 250 yards. Myself and my 2 brothers all shot several rounds. All shooting 7 mags with the same Federal premium ammo with partitions. It ran over 200 yards before a last shot that hit it in the back of the head. After skinning we found 7 shots thru the front shoulder 2 thru both shoulder bones none had expanded. Same exact size exit as entry. I know elk are tough but that was a joke. We all switched ammo after that. That goes against the grain since most people have high praise of the partition but I still wont shoot them.
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