Re: Question on new brass
Duck
As you start extending your range, EVERYTHING begins to matter more. Do your brass prep like it was for 1000 yds and you will not ever have to second guess your ammo.
Uniform primer pockets, chamfer flash holes, trim to uniform length, chamfer case necks, weight sort and segregate - cull out the heavies and lights (use them for fouling rounds - not sighters) and a pinch of powdered bat wing or newt's a$$ won't hurt, either.
The confidence of being truly prepared is priceless.
Paul