We did: Round top reciever with the same profile as a Remington 700 with Factory sights. Barrrel weight and length is predicated on caliber. However while some bigger calibers had shoreter barrels, 270, 280, 30-06 had 22" standard weight barrels., the 257 was first issued with a 24" medium weight barrel.
It was an insteresting aside that when Ruger brought out the 257 Roberts on the ST they used the 24"medium weight barrel the same as used on the 25-06, 7mm Mag etc.
The ST and the PL are built on a round top reciever that duplicates the profile of a Remington 700. These were made for shooters that wanted to use aftermarket bases and rings. Early on there really were people that were resistant to the intergal base/rings and didn't trust or want the intergal reciever/rings supplied on the vast majority of 77s, "R", "RS" and "RL" rifles.
The ST in 257 Roberts is/was a bit heavy. I used mine for a deer/varmint rifle from 1972 till 1975 when Ruger brought out the first 257s cataloged in the "R" with the intergal reciever/rings with a standard weight 22" barrel in 1975.
As mentioned it should be a shooter,
Ross