i did some reading a bit ago about cooking off of rounds, where the chamber temp is high enough to ignite a round, and this was for AR-15 type rifles, and that temp was right around 350F, and that temp was reached after doing mag dumps of 5 or 6 thirty round magazines.
so unless you are doing that, you should be fine.
if you still aren't sure, get a spare chamber flag you can sacrifice, turn on your oven to 350F, place the flag on a piece of aluminum foil, and place that in the oven for 10 min and see what happens.