I find this thread very interesting,I'm going to follow it.I have a Lyman GPR and GPP I bought 22 years ago.Man, they are still going strong. Great walnut stocks,wood to metal fit,ect.
About 10 years ago the gun stopped shooting as accurately as it had before. I could not figure it out. I checked the bore,I checked the sights,I worked up different loads, nothing helped.So I put her in the closet and hung my head.
A few years on, I had to get glasses.Low and behold, my gun started working again! Must have been a magic closet! JA