So I walk in to a gun shop in my town I live in and see the rifle and the caliber is .408 cheytac never heard of the caliber and was wondering if u guys could give me some info. On the round
The .408 is a very interesting concept and has in my opinion a number of good arguments for it. That being said it is also disliked and discounted for a number of reasons of which can perhaps best be categorized under impracticality and expense. You can see some information here (however there is some incorrect information also from a technical and historical standpoint)
Also there are a number of discussions here on SH. It is very nice to play with at long range when a .50 is as impractical as it is for me however I would never consider purchasing it as my primary weapon.
Another thing to consider is that according to my recent contact with EDM, CheyTac recently ran into some issues and is having to liquidate, again I do not have it on authority just what I understand.