No. 4 Rifle; Zeroing Instructions Data Inconsistency?

[Surpmil]

Interesting that other period documents warn of the effects of firing wet cartridges, and note that the SMLE has been known to fracture on the left hand side from the additional, unequal, pressures.

Curious that the second text states that "...in extreme cases the action body has been known to fracture..." Presumably they meant to say the bolt body.

The test done at Enfield wherein an unthreaded barrel inserted into an unthreaded body/receiver, with what we assume was a relatively close slide in fit, fired normally with absolutely clean chamber and ammunition, but was blown out of the rifle if there was any oil on either chamber or cartridge case is detailed at the top of page 270: Textbook of Small Arms 1929 [Great Britain War Office] : [Great Britain] War Office : Free Download, Borrow, and Streaming : Internet Archive

I would assume also that the barrel and body were not so close a fit to each other that the barrel itself expanded and adhered to the body during that test.