From looking at ATK's website it looks like a Federal loading. They have a 155gr .40 round with the Barnes X bullet. I guess officially called the "XPB". I would imagine anyone who sells the HST would have access to it but I've never seen it advertised as for sale. Does anyone you GT'ers know of carry these rounds (the 155gr .40 ones specifically)? Wanna kill these ads? We can help!