You can't "ream it out to .308" because 7.5 Swiss is larger in case body diameter. Hard to ream a hole smaller.
I don't know why nobody will crown your barrel, it is not a complicated job and is not specific to the make of gun. Probably wouldn't do much good anyhow, a barrel with enough wear to the crown to affect accuracy is usually shot out anyhow. We get a lot of Internet Recommendations to crown barrels, but seldom any feedback that it helped a lot.
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