If sales falter, yes.
270
Proofhouse.com has sn data.
Ruger website, under Customer Service, Historical Data, pick rifle pistol revolver or shotgun, then your model, and date of manufacture by serial number range is shown.
75-260 or so
50-260 or so
75-260 or so
You can measure the barrel yourself if you have it, using a steel tape measure. You can also contact Ruger Customer Service through the Ruger website. There is no published data that gives the barrel length of each firearm made by a given company, only the standard configuration for a given model- and THAT varies.
50-260 USD
50-260
50-260 or so
all of the .25 variations, and 260 to start with.
50-250 USD or so