JohnnyNorth,

Nice rig

The main obstacles in the UK for rifles chambered for 0.338 Lapua & 0.50 BMG is not the legislation but cost of the powder (and projectiles)

The powder I use in my tight necked 0.308 W is Vihtavuori N140 and this costs the equivalent of 55 USD per pound in the UK

Just looked on Sinclair Intl and 1 lb is 29 USD in the States !

Have fun !

Best regards

Russ