Swampy,
The British army stipulated that the MkVIII ammo was not to be fired in the SMLE because it burned out the bore at a fast rate. If you care about maintaining the condition and life of your barrel I strongly advise you don't fire it.
Box of Truth is a good site but I don't think they always have the best info on milsurps and Enfields.
Best, Tiki.
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