How long between shots?
I have a 30-30 that grouped ok at 50yds if you gave time between rounds. If you don’t fairly quickly groups opened up considerably. It never shot good at 100yds.
Here is how I fixed mine
I went back to the shop for disassembly and I knew when I had to take an acrylic mallet and knock the barrel bands off there would be problems.
I shot the rifle without the mag tube or bands and it shot great. I sanded a lot of wood off the forearm so that band would slip on vs hammer on. I gassed up the Dremel and cut a good amount of metal off the inside of the front band so again it would slide on vs hammer on. This actually got the mag tube off the barrel and created a small gap. I used some perma blue or something to reseal the metal.
Groups improved tremendously
Good advise here.
