Your best option for under $400 would be a Savage Axis 2. Or here's a Mossberg Patriot in 243, comes with a scope and everything. Item number 015813278409 just type the item number into buds search and it'll pop up. Hope this helps.

Are you looking rifle or shotgun? Plenty of slug guns under $400, but don't know if you want rifle or shotgun.

Ronald, the closest I can get you with a scope is the Savage Axis in .308 Sir. It is accurate, well built and a very good combo for deer hunting for the price. budsgunshop.com/product_info.php/products_id/104471/savage%2baxis%2bxp%2b308%2bwin%2b22%22%2bmatte%2bblack%2b4%2b1