He did put snow in his mouth (to hide the condensation of exhaling) but he used iron sights rather than scopes to have a lower profile.
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Image tax: another picture of him smiling. This has to be one of the most cheerful guys of all time. He even smiled after he had half his head blown off, after having over 500 confirmed kills, and that's just confirmed, as in it's a proven fact he killed them. He probably had a lot more.
And after getting his head nearly blown off, he still lived to 96 years old. And taught sniping for much of that.
This is easily one of the baddest motherfuckers who ever lived.