The 257 Roberts Classic was only made in 1982, on a short action and never in stainless.
This could be some distributor special but no Remington collector would ever recognize it as a Classic. None were stainless ever.
Sounds like a nice rifle and no doubt is a better rifle than the 82' 257 Bob Classic.
Hard to find anything like this for a tad more than a grand today.
Suggest you check with Roy Marcott to see if Remington ever built any short action cartridge on a long action.
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