I tried a lot of bullets and would go from sub moa to over moa on lots of them. I think part of it is the Howa mini is so light and narrow that it’s hard to shoot accurately.
That said the most consistent accuracy bullet was Berger 95 Classic Hunter… I m just cheap and like a little less expensive bullet but gun does like it.
(Tried. 108 Eldm, 105 AMax, 100 TGK, 90 TGK, 95 TMK, 95 CH, 95 VLD hunting, and 80 Sierra Blitz. The Blitz shoots well too, right with 95 CH but it’s a varmint bullet.
I did shoot some 400-540 yd rockchucks this last spring and the Berger CH proved itself again at distance as most consistent and accurate.