Nope, it was the 7.5x55 Swiss necked down, with a small but vital change in the shoulder angle. The .29 caliber bullets turned out to have extremely high ballistic coefficients, due to the combination of diameter and twist. For a short period after the cartridge was introduced it appeared the bullets actually GAINED velocity, but eventually they turned out to lose a few fps over 500 yards. But they did flip big game animals over on their backs, ready to be field-dressed.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
