Originally Posted by oakflat
O.K. I keep hearing not to get your barrel too hot! Well how hot is too hot, I have yet to find any info in any location as to this question. What I would like to hear is a temperature that is getting into the range that can actually cause damage. Say something that could be measured with an oven thermometer in the end of the barrel. Over many years of flying, cylinder temps were a BIG deal and for the best engine and operator life we tried to stay under about 375-400 degrees, this with aluminum heads and steel cylinders. I would like to hear both facts and opinion.
Oak Flat, I'll share my experience. It may or may not be factual, but it's what I've observed.
Barrel temp matters most when considering ammunition. Specifically, temperature sensitivity of the powder and primer combined with how long the round 'cooks' in the chamber.
There are smaller variables that will likely come down to matter of opinion. If the bedding job isn't 'stress free', there will likely be a POI shift. In addition to this, pressure pointed barrels that are accurate on a cold bore will likely suffer a POI shift.
This said, if the barrel is floated and the bedding job is stress-free, the only change from a 'warm' barrel, I.e. 2 to 5 shots should come from additional velocity from heating of the powder inside the ammunition.