I’ve only ever seen another one of these and there’s very little information available on the internet. The case MAY have been part of the ‘Red Queen’ or ‘Red King’ projects, although the case length and shape are different to the rounds from these two projects, so it’s doubtful.
The case is an L70 Mark 4 dated 1956 and made at Royal Laboratories Birtley (RLB). It is 238mm long and the necked calibre measures 40mm. A 1957 Dated primer is included.
There are two holes in the case at right angles to each other, presumably to ‘de-militarise’ it.
Will combine postage where possible for multiple purchases.
PLEASE NOTE: WILL SHIP WITHIN UK ONLY.