You should practice that far but do not let the guide or any one else tell you how far you should shoot at an elk or any other animal. If your maximum range is 30 or 20 or 10 yards then that's as far as you should shoot. If your guide don't like it then I would find a new guide. I wouldn't dream about shooting at an elk with archery equipment that was 75 yards away. Fifty yards would be an absolute personal maximum only if circumstances were perfect. Under the usual circumstances 35 to 40 is a realistic maximum for me.

It isn't all that hard to get hot bulls to under 30 yards. They can come in fast, hot, and heavy and be right on top of you (literally) before you know it. Getting a shot off is another story entirely. With two people working a bull it should be much easier than if you were doing it by yourself.