I use Vit N570 in my Lapua Improved.
I can use the same amount of Retumbo but the Vit has more speed, I tried H50BMG, US 869 & 24N41 but they weren't as good.
I have a 33.5 barrel & get 3120fps ish with single digit es according to my 35P.
The brass doesn't like it much but the primers still seat fine
It is built on a Rem 700p & I'm very happy with it, accuracy is stunning