Just got an Osprey prefit in .223 Wlyde, .062 freebore, .750 taperless.
I broke it in with cheap 55gr. fmj ammo and it did not particurly like it, hovered around 1.5-2" groups. About 100 rounds in I finally fed it some handloads and it perked right up. Just a load I threw together with no work up. Looks like it will hunt. This mirrors my experience with my 6mm Osprey, great accuracy in that one too.
Hornday 68 gr BTHP
25.0 grains of Varget
Nosler brass
CCI-BR4
5 round group
View attachment 8640686
20 round group
View attachment 8640687
Prefit on the Bighorn, really digging the .750 taperless. Seems like an ideal "hunting" weight contour as a suppressor host.