This one was listed as Peters Item No. 3090: “.30 Springfield, 1903, RUSTLESS, Belted Non-Disintegrating, Expanding, 225 grs.”
The bullet type was introduced in 1934 per Chris Punnett’s book “.30-06” and did not see manufacture post WWII. The .30-1903 was last listed in 1937 from what I can find in the wonderful selection of catalogs found via the IAA home page. There is a section drawing shown of this projectile in the “.30-06” book on page 281. I was looking for a pic of an actual bullet of this type sectioned but have yet to find one. Any such photos out there?