Bottle raising elk is done just like deer. The sooner you start on them the better. The female come out very tame and will be that way for life at least that has been my experience. The bulls I raised all were bad from two years old and up.
Start them in a darker area and stay with them and pet them. Clean bottoms and just bond with them. They are very slow to drink but the light bulb does go on sooner or later. From then on it just feed them and love them.
I have an old cow elk that is about 18 years old and always wants to be petted. In fact she will still walk by grain just to be with me. She will be here till she dies. She is a great pet.