Not a lot of risk there, the material is in tension with bolt thrust onto the receiver lug surfaces and the barrel is taking the outwards pressure component (if there was any risk the barrel would let go before the receiver - remember the failed Sako/Tikka barrel batch that happened a few years ago due to out-of-spec steel?). Having said that it would reduce the safety factor for big magnums/fat cases (this being the reason Tikka's are not recommended for the seriously overbore magnums as the tenon is quite slim) but a standard caliber would not show undue stretch I would expect. There are plenty of receivers with less holding them together - and remember the bloody great slab of steel on top for the scope base and the surface under the action to accept the lug. That was the point of my comment up above though, chamber the bugger in .338LM and see what happens haha.
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