I know its a bit under cal than what you're looking for, but what about a .204? If you're looking for an increase in power over the 22 Hornet, but less than the 7-08 (which I am assuming is your deer rifle), why not a more potent .22 cal. Something like the 22-250, .223, etc. I vote for the .223 because you can buy ammo really cheap if you don't reload, its fun to shoot, with the right bullet it can be used for deer, is available from almost every rifle manf.