My dad has a Weatherby (I think its a vangaurd, but it might be a Mark V, I can't remember). It is a 300 Win Mag. He doesn't reload and lives 1500 miles away, so reloading for him doesn't work very well. On one of my visits, he asked me to find some factory loads that would work and sight it in for him.
We bought several boxes of factory loads and it shot 2 of them to the same POA and under 1" group. The other 2 loads didn't shoot worth a darn. The 2 that shot really well were the Winchester loads (180gr Accubonds) and the Federal loads, the 180 Partitions. It can happen, that a rifle will shoot a particular factory brand/loading very well. This will work for him, as we then bought a couple more boxes of the federal loads and it should last him for quite some time. It would get real expensive if he shot much, and you have to shoot a lot to be efficient at Long Range. If money were no object, you could practice enough to be accurate at 700yds with either of those loads in his rifle. It is 100%factory and wears a Leupold VXII.
In my experience, a good rifle will shoot most everything pretty good and will shoot some loads REALLY good. There is only one way to find out, get a rifle and give it a whirl. $40/box for good ammo, sure makes reloading look better though ;-)
If some is good and more is better, then too much is just right.
My mind is a raging torrent, flooded with rivulets of thought, cascading into a waterfall of creative alternatives