Originally Posted by
Bruce_in_Oz
That clears that issue up, but what was going on that the "shoulder" needed adjusting?
Was it something to do with providing clearance for "mud" or dubious wartime ammo? Being a rimmed round, you can have a "generous" shoulder, and even body clearance (instant "improved" cases), and no problems with headspace / striker protrusion, unlike a rimless model in which length from head to shoulder datum is critical..
As a side note, what is the source of that illustration?
Back to exploring the crypt for the various .303 chamber drawings.
Does anyone have barrel / chamber drawings for Bren and Vickers, as well.
There seems to have been a lot of creative engineering in these regions for a long time, but even drawings for 7.62 NATO barrels show subtle differences between machine gun and rifle chambers.