Re: Bolt is difficult to close on a Remington 700 sps
If the bolt closes just fine on an empty chamber, then my bet is the chamber was not cut properly.
If this is a new rifle, it doesn't really matter, you need to call Remington and send it back for warranty service. Be prepared to receive a new action in your current stock.
If this is a rebarreled rifle, then you need to take it back to the gunsmith that barreled it.
If you really want to be sure, then order a .223 "GO" headspace gauge from Brownells, remove the ejector and see if the bolt will close on the "GO" gauge.