Found a 1903 Springfield with a massive barrel

I'm sure that years ago, before the 300 Winchester Magnum, etc became a thing, they were trying to squeeze all the velocity possible from the 30-06.

It's also worth noting that a longer barrel gives a longer sight radius which is usually better when using irons.

I was also under the impression that velocity relative to barrel length depends greatly on the cartidge (and probably powder) being used, with some cartridges experiencing diminishing returns the longer the barrel gets.

MarshallDodge: yes.. that means in the years before ca. 1963.. .

Mister Ridge: True.. Of course.. Unfortunately I don't have measurings yet for my 30-06-guns.. An almost new and an really old barrel to compare

I simply find the muzzle-velocity-jump from approx. 856 m/s to 886 m/s remarkable, with such an army cartridge-copy. And on the other hand,
there are some extra mildly loaded M1 Garand ammo-types on the market. Available even here in the small market of the Swiss Confederation..