Thanks to the forum I found out my H&R "defender" was from the last run from 1973 to 1978, and it was made in 1978 (serial number AS 54642). Do we know how many were made that year and how close to end mine is? I know it's not earth shattering, but it would be fun to know. I was 20 in 1978. :~O
Thanks Canada for the funky old ammo, I'll try some this weekend and post a range report.