Yes it's 534 diameter case head. I believe magpul hunter uses aics style mags, so max coal is 2.95 so the Sherman SS case would fit with all but the heaviest for caliber pullers as they may be too long. The MAX case line is definitely put of the decision if you want to use that stock.I am pretty sure the 7 max is the same size bolt face as the saum, correct? Has anyone ever run a sherman or anything short with a .540 bolt face out of a magpul hunter stock magazine?