Their is another thread speaking about Coggies so I'll let you read that and draw your own conclusions. As to the 2.5" case it is a nice Deer round and such. It is not a .375 Flanged Magnum or anywhere near it.

5 1/2" groups are not all that spectacular. You should be able to tighten it up but I would insist on shooting it and, if you don't know what to look for, post the target here.

The price, for a nice rifle as described is a bit high but not much. Make an offer.