Never owned a 257 Roberts.. but I like old school stuff the best...
but I have a lot of brass around here, that is stamped 257 Roberts on the bottom....
I use it to make 6.5 x 57 rounds... my favorite cartridge...
and then there is the 6mm Remington....my second favorite cartridge...
both on long actions... where they are kinda like the same concept the Creedmoor is...
if I was 20 years younger, and could fill a wish list....it would include a Model 54 in 250 Savage or 257 Roberts...or a Model 30 S Rem.
old stuff that worked long ago, has a cool factor a lot more so than the latest greatest cartridge on the month club...
I just got my 6.5x57 up and running last Friday. I rebarreled a Brno ZKK600 with a 24 inch #1 profile barrel.
I had a Model 54 .250/3000 but sold it to my brother. But I have first dibs to buy it back if he ever sells it.