Back to the drawing board rem 788 .308 ammo

[Delphus]

Well I just had a very frustrating time at the range.
I have a new to me vx3, and trying to zero it today, to set up the CDS. I made the very amateur mistake of trying to zero a new scope with new ammo. It took me a whole pack to figure out that my rifle doesn’t like the hornady SSP. At all. I just could not get it to group.
I zeroed the rifle with the federal blue box within three shots under an inch. Should I just abandon trying to find a better long range cartridge? Or will the trusty blue box don’t to 400m?