If sabots are legal just no copper jacket... I shoot a .457 diameter 405 grain flat nose flat base conical out of a .458 diameter Knight sabot with real good results. Also you might want to check out;

hunterman boolets

E-mail him with your questions. He has been real good working with me to get some special bullets for my rifles. His prices are more then fair, and he makes some nice looking stuff that would work just fine for you and elk. I just ordered 50 bullets from him. I like the Keith nose and the spire point. I think they would really do a number for you.