'Knute' - Your last 'link' is a fascinating read on the 1907 Palma Match.
(There are three books bound together, 1905, 1906, and 1907. The 3rd book, pages 53 to 78, shows the 1907 Palma match reports).

(I was mistaken in my above 'target post', saying that 1903 was the final use of the Krag rifle in Palma Match competition).

The U.S. Team used 'regulation' model 1898 Krag rifles in the 1907 Palma Match, held at the Rockcliffe Range, Ottawa, Canada.

The US Team of 12 men qualified by their performance at the 1907 National Matches at Camp Perry. The team was kept intact and the final official 8 man team was selected at Rockcliffe, based on performance during practice matches.

The U.S. ammunition was carefully loaded using a pointed UMC projectile designed by Hudson and (UMC) Thomas.

The British, Canadian, and Australian Teams used Lee-Enfield long rifles, (not SMLE rifles). The British and Australians used special ammo. I'm not sure what the Canadians used.
(The Canadians beat the US by 3 points on the 1,000 yard leg of the match, but, placed 2nd, behind the US Team by 40 some points).

The rules allowed that rifles could be private-made, but, had to follow government pattern.