Enjoy your BOB. Great cartridge that will do about anything you really need to do with a rifle.
But know this. The Roberts cartridge was obsolete and not chambered in any factory rifle for multiple decades after the .243 completely supplanted it. The Roberts was even dropped from most loading manuals during those decades. Bill Ruger brought the .257 back to life in the early 1980s IIRC. He did stuff like that. He also resurrected the single shot rifle.
Seems that Ruger had an awareness of mojo that drove him.
