Dave no doubt has the details

A.H. Fox used a DH SN 88807 ordered on August 9, 1898 by H.P. Collins in Baltimore. The gun was a 12/30 Titanic, with a straight grip and no safety. The gun was returned to Parker Bros. on September 18, 1900 by Fox to clean and rebrown the barrels and repair the action, and the work was completed October 5, 1900.

He won the 1900 Baltimore Shooting Association Tournament in March and the Sportsmen’s Show Tournament in May
and also in May set a new Doubles record of 98X100 with his Parker
https://books.google.com/books?id=UkohAQAAMAAJ&pg=PA413

He competed in the GAH at Targets in June
https://books.google.com/books?id=UkohAQAAMAAJ&pg=PA499

In August, 1900 he was using a Winchester Model 1897, with which he won the Baltimore Shooting Ass. Tournament in Nov.

He used the Winchester 1897 at the March, 1901 Madison Square Garden Sportsmen’s Show Tournament

He was one of 22 competitors who were straight at 25 birds in the 1901 GAH at Live Birds using the Winchester 1897, but missed his first bird in the shoot-off.

He was shooting for Winchester in June, 1902 but in the fall left Winchester to establish the Philadelphia Arms Co.

March 16, 1907 Sporting Life
https://digital.la84.org/digital/col...id/33726/rec/1

If I'm counting correctly five shooters, including the winner, were using Winchester LEADER shells --

Attachment 101464

and one the Winchester PIGEON shell which was offered from 1898 to 1907, both loaded and as an NPE --

Attachment 101465

The rest used Union Metallic Cartridge Co. shells, TRAP loaded shells --

Attachment 101466

SMOKELESS loaded shells --

Attachment 101467

and ACME NPEs --

Attachment 101468

I find it impressive that Ridgley B. Bond of Jessop, Maryland, ran them with the then new Baltimore Arms Co. gun.

Winchester Leader
 

Winchester Pocket Catalog of the Leader Shell and The loads some of the Champions shoot...

Trap3