So Wal-Mart is the deciding factor in what is a " factory gun/caliber" and what is' nt? Danny if thats the measure then you must exclude most WSM and WSSM, Rem Ultra and Short ultras, most any Weatherby mag and rounds like the STW as Wal-Mart typically has a poor or non-existent selection of such calibers and ammo.
So what is the flatest " Johnny Wal-Mart hunter" caliber? Well since the flatest thing they typically carry ammo for is the 7mag and 300Win Mag then those MUST be the fastest and baddest on the market... yeah thats it! Gosh I' m ditchin my Warbird and forgettin the plans for a 50. I think I' m gonna get a 30 Carbine.
Nevermind, Corvettes are the fastest cars on the roads because thats the fastest thing the Chevy dealers carry (those Ferrari and Lamborghini dealerships are simply figments of our imaginations

)!!!
RA