the cost of converting the m 1919 mg's in is going to be as great as procuring a new blank sheet design, and that's money ordinance is not going to pay for a minimal increase in effectiveness, coming at the possible* cost of a higher chamber pressure, redesign of the belts themselves, new tracer, ap, incendiary rounds, new tooling for the bore ,rifling, and chamber**snip
many of these costs where admittedly applied to the rifles, but that was offset by the advantages of switching over to semi-auto, and the fact that many in ordnance were convinced that a 30.06 semi-auto would be impractical at the time**
i'm going to ask if Hatcher's data that you're using is for the original pedersen round or the later t2 round, which increased the rim to .473 and straightened out case taper
*apparently the difference in British and us testing means that a straight comparison is misleading,
**proving that ordinance was willing to ignore a number of earlier designs