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This was 44 mag. pressures & in R-P brass only.
The load was new .45 Colt brass, Large Pistol mag primer, 34.0gr. of now obsolete Winchester 680 powder and 260gr. Speer HP.
I found, in the Winchester rifle, no other make of brass was suitable for these loads, not Federal nor certainly the even weaker WW.
Ross Seyfried used Fed brass & W296 in his tests, but I found Fed. to be weaker in the web area than R-P brass.
His use only of W296, prompted me to 'branch out' into other powders, like the W680, of which I had a lot. I worked to the same
expansion of the web as the W296 gave, and of course, obtained higher speeds as a result of the slower burning 'rifle' powder.
The Winchester M94 chamber cut-out, like on a 1911 pistol, made the use of R-P brass mandatory. I do not know if the other .45 Colt
rifle barrels have the same type of chamber throating.
.454 Casul brass might/would have been better yet.
Ross' load with the 250gr. Hornady HP was 29.6gr. W296, for 1,587fps. That load was fired in a 5 1/2" barreled single action wheel gun.

Further, in the Jan/Feb. 1994 RIFLE magazine, #151, loads in likely a Brian Pierce article for the Trapper Winchester Rifle(same as mine), Federal brass was used.
250gr. Hornady HP - 28.0gr. W296/H110 - 1,758fps.

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I've not read any of the sources you quoted, but I did read articles by Paco Kelly and John Linebaugh, about high-pressure loads in .45 Colt. Both of them used W296/H110 as their primary powder. I tried it, but did not get satisfactory results, so I looked for alternatives. That's when I found Accurate #9, and that did the trick, at least with the XTP. I'm going to try to work up loads with #9 and some other jacketed bullets (Nosler, Speer, etc.)

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