calrsons
https://www.choketube.com/choke-tube-interchange-guide/here is the guide
from the Savage/ Stevens website Removable modified choke tube, Winchoke style
Winchoke is the most common one out there Winchester , Mossberg , Stevens , browning , weatherby and a few others used it
it goes by a few names but is one thread pattern. Mossberg calls it Accu-choke for it's 500 line , browning calls it invictor be carefull they have an invoctor plus also
https://www.choketube.com/product-c...-inv-mossberg-500-savage-weatherby-20ga/