I did well with 777 loose powder and either the Barnes TMZ's, 250 grain sabots I think??, or the 295 grain tipped copper powerbelts with great results. 90-100 grains of powder. This was in a CVA Bolthunter Pro. This discussion has been on here before and I think the combination I used for mine was about the same, if I remember correctly, as the guys using the Elkhorn.