'FredC' - I did receive my copy of the 2004 "Gun Digest". The articles on the 1903 Palma Match and 'The Hudson-Krag Handloads' are quite interesting.

The 'boxed quote' in your last post is not what I wrote.

I wrote that: "Whistler & Aspinwall .30" propellant was sensitive to changes in temperature and humidity.

This reportedly caused variation in shot elevation and it was difficult to maintain 'correct' rear-sight settings with changing match conditions.
This observation was stated in an article, by NRA - Shooting Sports, regarding the 1901, 1902, and 1903 Palma Matches.

I haven't read or commented on 'W.A. - .30 powder' and pressures.

IIRC - The gist of the 'Shooting Sports' article was that early propellants lacked the consistency, stability, and predictability of more modern powders.

(IMHO - This sure had to add to the challenge of long range shooting, back in the day).