I shoot very little in the heat of summer. I hate the heat and it's just not fun for me.

When I do shoot in the heat and I'm shooting for groups, I take multiple guns to kill time in between shots for the load I'm testing. The TN heat is brutal in the summer and sometimes I have to wait 15-20 mins between shots.

In my personal experience, I believe my guns do not shoot as well in the summer and I know I don't.

I try and do all of my testing in Jan and Feb after all the hunting seasons end. That way I don't die from the heat and I get a more accurate reading of what the gun/load will do in hunting weather.