What actually kills a barrel? Velocity of the bullet or the volume of powder( casevolume vs boredia)?

Jens,
Just an answer from your neighbourcountry, the Netherlands. I think you're speaking of throatwear. Your question: I think it is both. If you want more velocity, normally you use more powder, you will raise your charge. There is no free lunch. If you fire too much highvelocity rounds in a too short time, temperatures will rise extraordinary. Besides that, if you fire the real HV rounds in a small (or bigger) caliber, you get very high pressures. The space for the maximum load in which the combustion take place is relatively limited. So temperatures and pressure will do the job and wreck the throat. I have learned that in a .270 Winchester the throatwear is about 0.004 inches (0,1 mm) after about 250 rounds, using 58 grains Hodgdon 4831sc and the AccuBond, 140grainer.
Nice day,
Jan.

quote:

Originally posted by jens poulsen:
What actually kills a barrel? Velocity of the bullet or the volume of powder( casevolume vs boredia)?

Abuse...

shooting the barrel until it's hot and then shooting it hot is the real killer of barrels.

Yes, it's easier to do this with large capacity cases than the 22 hornet.....but it can be done there too.