That is most deffinately not a 375. Ita a .416 something.
A 416 something was not available in a pre-64 Model 70. . It's a 375 H&H Magnum. . I have one built in the same year as the one in the picture. . The 375 H&H and 300 H&H had the notch in the front of the receiver to accommodate the H&H case length. .




























