The 461 might be the epitome, but the 46's predate it.

This A1 Varmint still shoots nice groups at 100 meters with powders and bullets it likes. That's an 8-32X40 M4200 on it.

It does a little better with 52gr. or 53gr. Sierra Match HP's and IMR or H 4198- averaging just under 1/4"- at 100 meters.