I used the platinums this past year in CO on a cow elk hunt. Put the elk down within 30 yards on a 50 yard shot. I couldn't get the regular aero tips to group but the platinum was a 6" group at 75yds with iron sights in a shooting vice. I'm shooting a 50 cal TC Encore. For whitetails in IA though, I found 100gr 777 and barnes mz expander is the most accurate combo for my gun.
Just asking, can you actually return bullets to the store? Cause if you can, I got a whole box full of them from testing different brands......