Few years back, the temp was something like 49C on the rifle range at the Hefley Rondy, in the sun - it was a warm one for the BP ctg. event - guys sitting and laybing down shooting off sticks. Barrels too hot to touch, before shooting. Leading stickingout the muzzles 2" - quite a sight to see. That's 122F, btw.
Thankfully, it hasn't been that hot at the Rondy since.