The Tupperware that's on it is not a featherweight style. It looks just like the ones I had in 300 RUM but short action.
There's more than a few folks who never give them a 2nd look for that very reason, not realizing that they were ALL Fwts and all one needs to do is procure the stock of their choice w/Fwt bbl channel.
I find 243's more often than any other chambering in SS Classic Short Actions, but, I don't find any of them very often.
As I said above, if I wanted that action but a different chambering, I'd re-barrel and save the original if I thought re-sale was ever going to be a concern.
