No experience with the 257 Bob, but a real fun 25 cal to use in a short action build is the 250 Savage-AI. It can pretty much do whatever the Bob can, and brass is much easier to come by since you can neck up 22-250 and being an AI case the brass lasts forever. I have one in an Apache Gunworks barrel that is 16" Varmint contour and I love it. Nice light and handy.
The Bob is just a bit too long to squeeze in a SA but in a LA it should work fine. If you are dead set on the Bob I would go with a 257-AI and make your brass last and give you a bit more zip if needed.
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