I am using the Hornady 200 gr. Interlock bullets. I have some 185 TSX Barnes and some 225 gr, Barnes X bullets to try out. But I will have to shoot up all my 200 gr. Hornady's first. I am a little leery about tying another load, the 200 gr. load is shooting sub MOA at 100 yards as it is. I may just stick with it and just hand on to my Barnes bullet for a later time.