I haven't seen very many lefty .300 win mags go for sale. Don't think they'd bring .338 prices but would have to beat the 7mm rem mags. The last blued 7mm went for $728 on GB, although the blueing was damaged.

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Ancient order of the 1895 Winchester

"It's an insecure and petite man who demands all others like what he likes and dislike what he dislikes."
szihn