I would wait for a .54. Investarms makes the Cabelas Hawken . They also make the Lymans. The Cabelas is basically a Lyman Trade rifle, you might be able to pick up a .54 barrel for the Trade rifle and it should fit the Cabelas. Worth checking into. I have taken more deer with my .54 GPR than any other gun. Nothing wrong with a .50 but .54 is better.