RE: 43 degrees makes a difference.
All this talk about barrel temps is getting me a little concerned. This past week on two occations I shot 25-30 rounds through my Optima and it never gets beyond warm to the touch. I'll shoot 300g xtps with 100g of 777 pellets darn near one after another. Air temps here around 80 and some humidity.
Should that barrel be getting warmer than that?