There is an awful lot about the Ross story that has not really seen the light of day, and may never unless someone takes the time to really dig into the matter. Yes, the authors of The Ross Rifle Story did, but there is more. I've found some myself in just a few hours digging online. Of course they didn't have the benefit of the Internet when the book was written.
Sam Hughes was a very patriotic Canadian, a loyal supporter of the Empire, but also very much a Canada-firster. Being a man of bull-dog determination he also had the flaws of that personality profile: a tendency to be dogmatic and bloody-minded. It was he was refused to allow a shortened Ross MkIII, not Sir Charles Ross. It was he IIRC who insisted on the minimum chamber dimensions.
The fact is that the Ross had few friends and some of its friends, like Sir Sam Hughes and Col. Harkom, were almost as good as enemies at times.
The Imperial authorities, civil, military and in the UK arms industry especially, were against the Ross and against the idea of Canada making her own small arms. Some like the Canadian representative of BSA, made no secret of their agenda.
They got what they wanted in the end.
Unlike Avro Jetliners or Arrows we still have Rosses around to examine and test and compare all we want. The design wasn't perfect, but it was certainly impressive.
In 1940 the British specifically asked for scope-sighted Ross rifles. We had none to give them.
One has to remember that the Ross was designed to be the perfect rifle for the previous war: South Africa. The Boers were almost all marksmen - if a Boer wasn't, he wasn't considered much of a Boer - they knew their rifles like the bowmen of England and Wales once knew the long bow. The British also set about designing their "perfect rifle" for the previous war: the Pattern 14. A rifle with all the advantages of the M1895 Mausers and none of the disadvantages; except of course the five round magazine and one piece stock.
The SMLE was considered by the experts to be rather passé before WWI. Not as accurate as the Long Lee Enfields, a compromise weapon for infantry, mounted infantry, artillery and cavalry based on the South African experience again. A compromise that "would do" until something more modern was devised. By a stroke of pure luck, it turned out to be a good length for the trenches of WWI, but that was an accident such as rarely happens in weapon design!
I find the MkIII to be less handy and well-balanced than the MkII or the SMLE, but it was designed for the long .280 cartridge, just as the P14 was designed for the .276 cartridge. The MkIII would have benefited from a two piece stock and smaller wrist, but there had been problems with Enfield butts coming loose in South Africa and a one piece stock was cheaper to manufacture, and lighter.
The real problem with the straight pull is primary extraction. The only solution to that is ammunition quality and rifle maintenance. As Smellie has pointed out before, the Department of Militia & Defence refused to issue cleaning sticks and we allowed the Imperial authorities to issue sub-standard ammunition. The rest is history.
The "Long" Lee Enfield MkI is 61.45 inches with bayonet fitted
The Ross MkIII is 61.50 inches with bayonet fitted.
The SMLE is 56.7 inches with bayonet fitted.
The Gew98 is 49 inches long with a bayonet of 19.8 inches for total of 68.8 inches (late war 10" bayonet introduced)
The Steyr M95 is ??? inches long with bayonet fitted.
Without bayonet fitted the Gew98 is exactly 1.5" shorter than the Ross MkIII, with the bayonet fitted, it is 7.3 inches longer. How did the Germans ever make it into their dugouts folks?
So how much difference did the approx. 5 inch difference between the overall length of the Ross MkIII and the SMLE really make? The Germans seem to have managed until late in the war, which a much longer combination of rifle and bayonet.
And Smellie I hope you have written a full account for posterity of your conversations with those three men, we owe you a debt for having the foresight to interview them, or their testimony would be lost forever.