First shotgun I ever shot was a little H&R small frame 28ga hammer Single. As I recall this gun was made in 24 & 28 gauges plus the .410 bore. It was a scaled down version of the larger H&R single hammer gun. This gun belonged to an Uncle, by marriage, & I was unable to acquire it. I did get to shoot it again in later life & we weighed it at the time. As I recall it went 4lb 2oz.
My gun growing up was an H&R single shot in 28 ga. Me and my brother killed a ton of squirrels with that gun and a few grouse. I now have it for my boys to use. Nice looking gun for a H&R single with case hardened frame and good looking wood.