James
It looks pretty similar to the NEF Huntsman. Be the first to do a Rossi review. I hooked you up with their website. I clicked on their manual but it was a broken webpage. Not sure if the rifle is rated for 150 grains with pellets. Their online dealer (Davidson) offers a lifetime replacement warranty with the gun. Sounds pretty sweet for that low price, but I would email Rossi about that manual literature first. It may contain powder & bullet restrictions.
http://www.rossiusa.com/products/gun....cfm?series=MM