I recently had my Ruger M77 7mm Rem Mag bore scoped because I suspected the barrel may have been burned out because of degraded accuracy. The gunsmith said the throat was burned out and the bore pitted. It was chrome molly made about 20 yrs ago.
I’ve been thinking about this and it seems a little early in the barrel’s life to have this happen. There have been a maximum of 600 rounds through it. When working up loads I always backed off after seeing signs of excessive pressure, stiff bolt and excessively flattened primers. The loads I have used for it seem to work fine as in easy working bolt and not excessively flattened primers. I always kept it clean except, I did leave it dirty after one hunting season. I almost never fired it without letting it cool except a few rapid fire, four shot groups occasionally.
I’ve done some research on barrel life in the past and have read typical barrels should last anywhere from 1000 – 5000 rounds.
So I am wondering why the short barrel life? I figure it takes maybe 100-200 rounds just to break a barrel in and work up loads for it. Then it would be good to fire 50-100 a year through it to stay proficient with it. At that rate it doesn’t take long to reach 600 rounds. Would like to avoid this in the future.
Any thoughts? What have other folks experienced with barrel life and degradation?