Sorry, one other thing, some sources say it does not use a standard 243 bullet but instead a 245. Degol I think make them in Belgium, but they are kind of unique I think. Boxford used standard 243 bullets in his rifle but then I think he was using a 243 calibre barrel. You should take care about using his data if you have a barrel that is not in .243/6mm. You could always try asking Holland & Holland!