The thin barrel was designed to be supported by the wood in the middle of the forend and towards the nose cap of the two first Rifle Marks.This enabled a thin barrel to be "tamed" as it heated up,as well as insulating the barrel so mirage didnt disrupt the sight picture in addition to keeping flesh away from the hot barrel.
After 15 rounds through my K98 I have problems with mirage,I cant remember ever having problems with mirage from any 303 .
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