Rapid Rob, don’t spout Hogwash.
The British Indian Government had ample supplies of its own Ammunition made at “Dum Dum” Arsenals, Northern and Southern Circuits ( near Calcutta (Or “Kolkata” to modern Indians.) The Dum Dum factory was run and managed by some of the Best Technical Officers of the British Army, with full Scientific and Technical Backup of Britain. The ammunition of the Arsenals and the Rifles from RFI (founded in 1907) had to match the standards of the same made at “HOME” in Britain…none of this “substandard Garbage” if you please…equipment and ammunition had to be interchangeable with British ( and also Aussie) made equipment… In fact, the Lithgow made SMLEs (Pratt & Whitney Machinery) were “Better made” than RSAF and BSA examples… and the RFI came in a close second.
The use of the 154 grain bullet had been experimented with before WW I, during the development of the Mark VII projectile ( 174 Grains, but with inner point of aluminium or pressed paper in WW I).
The Russian Projectile, being “undersized” by a couple of thou’ of an inch, was not an issue to the .303/.311 SMLE Barrels… the “skirt” acted Minie-style, to engage the rifling, just as it did on the wide variety of Russian M91 Bores and grooves.
IN 1918, Kynoch saw that the Russian contracts were finished (By the Revolution,) and with Millions of LPS Projectiles on hand, simply loaded them as if they were “Mark VII”…and straight to the Battlefield. They knew from previous testing that the 150-odd grain bullet (without a “filler”) had the same Centre of Mass as the 174grain, and so would fly in a similar trajectory; and at a few hundred Yards, that was all that mattered…This was a “Trench War” after all, not a Napoleonic Battle.
Some readers and Posters are too “Picky” on the few thousandths of an inch here or there… We are talking Combat ammo here, made in Millions ( if not Billions) of rounds and NOT Benchrest Anality. And I might say the R word as well…through ignorance, not necessarily from bad faith.
Down Under… Curmudgeon in a Bear Cave…the Grizzly took off!!!.