barm,
Have been using Li'l Gun in my Ruger No. 1B .22 Hornet for 16 years now, for plenty of prairie dog shooting where the barrel often got pretty hot. Through the borescope the throat looks nearly new, and accuracy is as excellent as ever.
Now, that said, the .22 Hornet isn't known as a barrel-burner, but don't know of a rifle round where Li'l Gun would be a good choice that would be known for frying barrels.
