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VIIIz in Lee Enfields

I'm aware of the Vickers' VIIIz's diktat that it wasn't to be used in rifles "on pain of pain" type of thing, but why? I've heard various explanations, including the one here that the chamber pressures were too high; also that the Lee Enfield's twirly bolt head's thread wasn't up to it, but the most compelling explanation I've heard is that the VIIIz's boat-tail created an awkward little gap that encouraged the burning powder to eat away at the rifling (presumably the Vickers used a different type). Okay, that's the most compelling explanation to me but I haven't the foggiest which one is actually true, so I thought I'd introduce some helpful obfuscation.

--Vomit 22:20, 9 July 2009 (UTC)

It's the peak pressure. Although saying that, there was a load of Yugoslavian 8z around a few years back that was fine.

What you wrote about the boattail is complete and utter nonsense.

In any case, Mk.VII will eat the throat far faster than Mk.VIIIz for the simple reason that Mk.VII is cordite and VIIIz is not (the "z” is the giveaway).

--Stoatman 10:06, 10 July 2009 (UTC)

Unfortunately I can't remember who came up with that little nugget of wisdom now. But should I remember, I'll be sure to disparage them. I suspect it probably wasn't Ian Hogg, who generally knew what he was on about. Excess pressure it is, then! --Vomit 07:21, 1 August 2009 (UTC)