No I haven't. In a few other calibers, not all, I found the Hornaday Custom to usually group better than Superperformance. I've only had a couple of range days with the Tikka(just bought it 2 months ago) so haven't tried alot of different ammo. I have a box of the Superperformance and Custom 55gr vmax that I will try yet. Winchester 45jhp and the Custom 50gr Vmax both shoot REALLY well, Rem 45jhp was OK but other 2 were better for me. First 2 shoots in the field at yotes was with the 45jhp both were dead. One was 35yds and other 150yds.