I bought it with a 375 H&H barrel but in the pics I have the 404 jeffery barrel installed. Shoots just as good as the Africa ph stock and I also tried it out with a 30-06 barrel which put 5 shots in less than an inch at 100m so pretty happy with that. I now have 6 M03 barrels and the two stocks/actions, 22-250 jagmatch 30-06 solid, 300wm solid, 9.3 by 62 fluted stalker, 375 h&h std, and 404 jeffery Africa ph . I think that will cover all bases.