Louis, there are technical differences between the M1924 .30-06 "Sequoia" model and the M1925 that came in 7x64, 8x60 Magnum (S), .30-06 and others. You have to look carefully, both outside and in, but they exist. As I own both, I ought to know. My own M1924 is Steyr serial number 299. The receiver ring inscription has been crudely altered from M1924 to KAL:7.62x63, the metric name of the .30-06.

Externally the M1924 is distinguishable by the "stubby" foreend, shorter ahead of the sling stirrup than on all other Mannlicher-Schoenauer rifle models. The M1924 has an unique Express type rear sight with three folding leaves, no standing one, marked 200, 300 and 400. The M1925 has the usual M-Sch standing rear sight with just one folding leaf marked 300.

More important is a different magazine design: Though the M1924 was the first M-Sch model with a cartridge guide ring inside the magazine, this guide ring is mounted more forward and is around the bullets of the cartridges, shown third from left in the photo below. In the M1925 and all subsequent M-Schs the cartridge guide ring is positioned farther back. It now grips the cartidges by case neck and shoulder, fourth from left is the one of my M1925 in 8x60 Magnum.

As the M1924 "Sequoia" model is so rare, only about 500 ever made, these differences are little known and go unnoticed by most. So usually M1925s in .30-06 are mistaken for M1924s.