Greetings @JohnDuxbury,
This is one of the challenges of loading for European cartridges in a European rifle using US data The European rifles often have larger groove dimensions and sometimes different diameter projectiles. Consequently these rifles will produce less pressure with the same loads as their US counterparts. Additionally a European rifle may produce considerably less velocity than shown in US handload data especially where the cartridge has been domesticated for the US market. This does make life more interesting for those that load them.
Regards Grandpamac.
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