I can see the Snipers wanting to hang on to their bolt guns. It's a stable tested and accurate platform. IMO a bolt gun is inherently more stable than a gas operated semi auto for that type of work.
I believe that the British Royal Marines adopted a Sniper System in .338 Lapua recently maybe somebody from the UK knows.
Sgt. Rafael Peralta ,United States Marine Corps
Company A, 1st Bn, 3rd Marine Regt, 3rd Marine Divison
We will never forget your valor and sacrifice.
Semper Fi !