I am looking at my FN (Belgium) Commercial '98 action .375 H&H and an Interarms Mark X '98 action .30-06 side by side. I can find little difference in the two. The length of the Mark X and the FN compare to my Military Gew 98. The only difference I see is the length of the magazine. I don't see that the feed ramp area is less on the .375. It does seem that the bolt goes back farther and there is a small notch cut in the face of the Ring to allow for the bullet tip to clear on loading
Would this mean that any lenghtening be at the back of the Magazine, rather than the front? In this way, there is no lessening of the metal behind the lower lug?