I recently purchased a Remington 700 sps .300 win mag. I would like to know if this is a decent platform to start with for long range accurate shooting. I would also like to know where you would recommend starting upgrades. Currently it is a stock rifle with a Leupold vxiii 4.5-14x50 with CDS and Talley one piece rings. I am looking at shooting Barnes 180gr TTSX. Any recommendations greatly appreciated.