Best factory ammo to site new 300 WSM?

If you are ultimately going to reload, just start there. For the price of 3 boxes +- of factory ammo you can get a good start on reload components/equipment and won't have random left over factory brass that won't fit into most reload plans.
In the first 100 rounds of reloads down the barrel will have learned a lot about your rifle and will have begun establishing a good load for it.
 
Thanks RB,
That's the plan. I have a Lee single-stage press and appropriate dies.
I've some reloading experience but certainly not as well versed as some on this site.
I have purchased a LabRadar Chronometer that has very good reviews.
 
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