The standard shank is the small shank. You can build your rifle on either but it is not necessary to have a large shank for a 7mm reg mag. I have 7mm reg mag built on the standard shank. I know the receiver with the standard shank will take the magnum bolt face and I can figure a reason where the large shank would not take that magnum bolt since that is the reason they built a large shank, for magnum calibers...
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