I have finally decided to take the plunge and have a rifle built by Kirby. I will be hunting relatively small black tail deer with it. I have noticed that Many on this site have gone with the 7mm over the 300. The only reason I can think of is that 338 Lapua brass is easy to obtain and excellent. I don't know too much about the 300 Raptor and have never heard of the parent case. Can anyone chime in on things they would have done differently when having Kirby build a rifle? I'm still torn between the LRSS and Stalker. I leaning toward the LRSS but haven't quite made up my mind.