I have a custom Mini 14, .223 that just loves the 65 gr. Gameking, best shooting bullet in that gun.
It's a good bullet and a killer.
DF
Edited to add, a lot depends on velocity. A great bullet at .223 speeds may be less than optimal at .22-250 speeds. I haven't tried the 65 gr. Gameking in my .22-250, it's great in the .223. I have other bullets for the .22-250, save the Gamekings for this rifle.
I've posted before, matching bullet construction/terminal performance to velocity is an art.