I've recently got a 6pr shrapnel shell stamped 6pr II then 6cwt SL or QF. dated '96. iI is of the nose separation type with screws and anti rotation pins to keep it together. the head and fuze pocket have a distinct groove below them due to a raised ridge in the mating part. I have an illustration of the MK V version that does not have the grooves. The question is were the grooves filled with anything? maybe a felt washer or solder? any one have an illustration please?