Those are nice looking bullets and nice shooting!
Are they somewhat soft copper like a Barnes TEZ? I Full Formed (not a true FF as only the rifling is engraved) some 250gr Barnes TEZ yesterday, it worked quite well.
Send me some of the 265gr .452. I'll see how they shoot Full Formed out of my Brux 45 cal SML.
4 shot group of 250gr TEZ at 100yds