Maybe it has something to do with the fact that I use Firefox. When I search for "Savage model 24 Series S" for example, it discards the "24" and "S" saying they are to short and searches on "Savage", "model" "series". If I search for Stevens Model 44 1/2, it discards the "44" and the "1/2" saying they are too short and searches on "Stevens" and "model".
Actually, here is what it says (cut and pasted)
Search: Key Word(s): savage, model, series
The following words are either very common, too long, or too short and were not included in your search: 24, s