+1 on the 7mag good to and past 600. The limiting factor will be you. You really need to start loading your own, if nothing more then for cost efficiency. I went to the gun/hunting store the other day and HOLY CRAP!!! Things are getting out of hand when some of the major ammo makers want $45 for a box of 30-06ammo. A few years ago the same 162grSST ammo I load in my 7mm were $35 a box. Now they are about $10 more. I can reload that same box for around $10(give or take).
Great gun, great round-get the equip to load your own it'll pay for itself in no time, then you'll not only have a gun that shoots good but you'll save yourself some money.
Courage is just fear that has said it's prayers.
The people trying to say the 2nd Amendment is outdated are probably the same folks that would say the same thing about the Bible.