"Cooking rounds

[Tim N]

Hi All,
Not sure if this has been covered yet?
I was wondering what peoples experience is with leaving a round in a hot chamber for a while before shooting resulting in a velocity spike from the extra heat?
Or is there no effect?
What is the temp inside a round when fired?

[Brad Y]

I don't think it a well tuned load that has a wide accuracy node it's as much of a problem, but just in case I generally won't shoot a round if it has sat in a hot chamber too long. The only thing I won't do over that is unload a live round that has the projectile touching the rifling ie jammed. I worry more about loose neck tension rather than a warmer round. Probably worrying about nothing there thigh either unless it feels sticky trying to pull the bolt back. Probably best to try some club shooting with loads left in a warm chamber and see if it affects you. Best way to test it

[saum2]

Tim,
Don't close the bolt until your ready to go, then you won't be "cooking" a round. Especially when being coached, you need to work with the coach and realize the weather situation at the time. You can be on target ready, closing the bolt is just a half second.
Geoff

[Send-it]

.......Or is there no effect?.....

There is definitely some sort of 'effect'.
How it effects your own rifle can vary very slightly though, so its worth trying your own to find out its characteristics.

Most of the time though,....a cartridge closed inside a hot chamber will effect the waterline, with the most common symptom (that I've encountered) being a point of impact higher than desired. Sometimes it's enough to put you just above the 6 ring or x ring etc.
What's the temp? good question.
It's enough to raise the temp of your barrel in a millisecond anyway.