I think mine was an H&R also.
I remember the night we got it... we were coming home from Academy circa 1983.
Our neighborhood was in the back of the rich neighborhood & you had to pass through the Golf course & over a bayou bridge to our neighborhood. My dad pulls the Elcamino over next to the golf course before bridge & pulls the .410 out of the back seat & says ... watch this. He fired that thing & it was about 9pm ... boy did that thing echo into the night... my eyes got big & wide, i was thinking... ummm i have to shoot that? Of course, shot it first time in the day time & it didn't sound quite the same as the first night