I just bought a used savage model 16ss off gun broker in what was advertised as 7mm-08. Upon arrival and after I gave the gun a thorough cleaning I noticed that the bore diameter looked significantly larger than my 7mm rem mag. I did find what appeared to be many tiny balls of something in every nook and cranny of the reciever and bolt head. The barrel is new (or very close to it, and has no markings or caliber indications what so ever. This is leading me to believe the gun is not a 7mm-08, but rather chambered in either .308 or .358 win. I did buy a brass casing (and a box of 7mm-08 ammo and either chambers fine. A 7mm bullet will easily slide down the barrel. Is there a way to determine the caliber? Thanks!!