So I had the lubesizer out on the weekend and thinking of giving it a workout, or at least scrape the 20 year old lube out of it and start again. With half a block of a lube that Paco Kelly gave me back in the 80's that I used to chisel pieces off to put in the lubesizer and it's interesting getting it out when the weather has cooled. I got to thinking/wondering about what accuracy differential is there between lubes, or more so "the barrel" when different lubes are shot down it without cleaning the old stuff out.
Now a long time ago when I used to machine rest my pistol loads I noticed that I had to clean the barrel well before putting a new load down with a different lube. It seemed that the barrel had to settle down between lubes, almost one lube in, one lube out before I could consider the group to be true.
Although only testing over 50 yards, and having the group size noticably different I would assume the implications of two or three times that distance would be dramatic on group size. Until the old lube has replaced with the new lube.
I know now that if I use a PC'd projectile and then shoot a group with cast/lubed projectiles the group sizes are chalk and cheese.
So am I blowing wind or has everyone known this and it's well documented and I've missed the boat.