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barrel life of a machine gun can be as little as 150 rounds that is why crew served weapons come with an extra barrel
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A mg barrel will not be shot out in 150 rounds. For one, there are only 100 rounds in a belt so you cant go cyclic for 150 and even in cyclic fire you dont have to change the barrel for 1 minute. You basically have to warp a mg barrel to destroy it. Keep in mind, these barrels arent designed for MOA groups. Crews have multiple barrels to keep from warping a barrel under sustained fire and change it out in different time intervals depending on their rate of fire. For example, 6-9 round bursts the barrel is changed every 10 minutes, 10-13 rounds bursts every 2 minutes, and cyclic every minute. Thats all for a 240B.
The OP seems to be having problems with throat erosion from hot loads not from the barrel getting too hot. I would just back off the loads some to make the barrel last longer or have a gunsmith take a few threads off and rechamber.