Almost got ya for a minute there!
Don't be fooled by the title. I'm talking about
solar barrel heating; not of that from friction or combustion associated mainly with centerfire and rimfire rifles. I am curious to know whether points of impact could vary (considerably?) depending on how warm the barrel is from sitting in the sun a bit.
Example: It is 77F degrees inside a house; so is the barrel. Go outside, and it is 90F degrees. The sun is also pretty strong, and the barrel absorbs heat energy (because of a dark finish); the temperature of the barrel may rise to 100F degrees or more.
Patriot