I am calling Stiller Monday and ordering the Python action, I am leaning toward a 330 Dakota or 338 Lapua. I would like you guys opinion on a barrel and what twist to stabilize the 300 gr Sierra MK. I would also appreciate you guys opinion on the Mcree Precision aluminum stock for the above gun. I have never built a bolt gun before so it is a learning experience for me. Thanks in advance for any info given.