How "hot" does the Mini-14 need to get before the heat will cause a chambered...

...round to "cook-off"? I use 5 round magazines in a Mini-14 Target Model and when I fire them, let's say over the course of a minute, the barrel is VERY hot to the touch, more so it seems is normal. The Target model has an extra heavy bull barrel so I'm thinking this may keep the heat from dissipating, but I was told that should not have an effect. I want to purchase a larger 10 or 20 round mag but am afraid of the risks in sustained firing. How much sustained firing of this rifle should be "safe"?
 
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