It is reported that the Hunter Arms bolt action 104.7 was 20g; 104.5 .410.
Here is a (sold) 104.5 .410
Another (also sold)
BUT Sears also sold a Ranger 105.20 16g bolt action which was a H&R Model 120; a 105.21 20g; and a 101.12 .410.
And there are lots of Sears model number lists on the internet as to actual maker, but they are not consistent and some model numbers are repeated