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Long Range Hunting & Shooting
What really causes a barrel to wear out...
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<blockquote data-quote="Greyfox" data-source="post: 1577871" data-attributes="member: 10291"><p>I thoroughly enjoyed listening to the OP's theory! I have also wondered about what actually contributes to barrel wear. I have also noted-cracking in just about every barrel that I have considered "shot", and have made it a practice to monitor round count, BTO/seating depth, and fire cracking for the life of my barrels. For my fairly stringent standard of accuracy deterioration of .25-.5MOA, and .005" increase in seating depth, combined with fire-cracking visibly extending into the lands...if the barrel isn't already shot, it will be very soon. I have seen firecracking develop in the free bore section of the throat between case mouth and the lands very early in the life of the barrel(300-500rds) and not advance into the rifling until 2000+ rounds, with no prior loss of accuracy. This is the case right now with my 6.5x47 at 1600 rounds. It's been firecracked in the freebore section since 600 rounds and it hasn't advanced. It's still at .25MOA accuracy with no throat wear. I have often wondered why the fire cracking takes so long to extend into the rifling. I wonder if the OP's theory plays into this. Could the pressure max and heat at that point at the cartridge mouth, combined with the smooth surface of the freebore section, be more susceptible to stress/expansion...causing the early firecrscking Interesting stuff to ponder!</p></blockquote><p></p>
[QUOTE="Greyfox, post: 1577871, member: 10291"] I thoroughly enjoyed listening to the OP’s theory! I have also wondered about what actually contributes to barrel wear. I have also noted-cracking in just about every barrel that I have considered “shot”, and have made it a practice to monitor round count, BTO/seating depth, and fire cracking for the life of my barrels. For my fairly stringent standard of accuracy deterioration of .25-.5MOA, and .005” increase in seating depth, combined with fire-cracking visibly extending into the lands...if the barrel isn’t already shot, it will be very soon. I have seen firecracking develop in the free bore section of the throat between case mouth and the lands very early in the life of the barrel(300-500rds) and not advance into the rifling until 2000+ rounds, with no prior loss of accuracy. This is the case right now with my 6.5x47 at 1600 rounds. It’s been firecracked in the freebore section since 600 rounds and it hasn’t advanced. It’s still at .25MOA accuracy with no throat wear. I have often wondered why the fire cracking takes so long to extend into the rifling. I wonder if the OP’s theory plays into this. Could the pressure max and heat at that point at the cartridge mouth, combined with the smooth surface of the freebore section, be more susceptible to stress/expansion...causing the early firecrscking Interesting stuff to ponder! [/QUOTE]
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What really causes a barrel to wear out...
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