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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel erosion?
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<blockquote data-quote="AZShooter" data-source="post: 1665059" data-attributes="member: 5219"><p>I wish I had a hawkeye long ago to solve some mysteries. Have one now and can report that a Bartlein 5R 6mm-284 1 in 7.5 twist shooting 105s @ 3475 fps and the 257 Weatherby Lilja 3 groove 1 in 10 twist shooting moly coated 115 VLDs @ 3680 fps both developed issues right around 1000 rounds. I experienced difficult cleaning, requirement of several fouling shots with first few foulers WAY off POI at 100 yds. Both would shoot great after the foulers for ten rounds or so then open up. Got tired of repeating the long cleaning session with a short accuracy window. I considered them worn out. </p><p></p><p>Bore scope inspections showed both barrels had the firecracking you mentioned AND long longitudinal cracks running up the bore for well over 8". For grins I cut off 6" from the Bartlein 6mm-284 and machined it again for 6mm-284. Much to my amazement it shoots once again, I don't expect it to last very long but it was a free experiment as I have a lathe. </p><p></p><p>I cannot help with suggestions on places to look or for reading material. You could go to your gunsmith's and look at barrels that were pulled. Be sure to look at every rifle new and used you can get your hands on too. Inspect throats to see if every land starts at the same place in the throat, some don't. See if you can see lumps of copper fouling, bad crowns or even missing lands. That exposure will teach you a great deal. </p><p>You can even look at the insides of a cartridge.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1665059, member: 5219"] I wish I had a hawkeye long ago to solve some mysteries. Have one now and can report that a Bartlein 5R 6mm-284 1 in 7.5 twist shooting 105s @ 3475 fps and the 257 Weatherby Lilja 3 groove 1 in 10 twist shooting moly coated 115 VLDs @ 3680 fps both developed issues right around 1000 rounds. I experienced difficult cleaning, requirement of several fouling shots with first few foulers WAY off POI at 100 yds. Both would shoot great after the foulers for ten rounds or so then open up. Got tired of repeating the long cleaning session with a short accuracy window. I considered them worn out. Bore scope inspections showed both barrels had the firecracking you mentioned AND long longitudinal cracks running up the bore for well over 8". For grins I cut off 6" from the Bartlein 6mm-284 and machined it again for 6mm-284. Much to my amazement it shoots once again, I don't expect it to last very long but it was a free experiment as I have a lathe. I cannot help with suggestions on places to look or for reading material. You could go to your gunsmith's and look at barrels that were pulled. Be sure to look at every rifle new and used you can get your hands on too. Inspect throats to see if every land starts at the same place in the throat, some don't. See if you can see lumps of copper fouling, bad crowns or even missing lands. That exposure will teach you a great deal. You can even look at the insides of a cartridge. [/QUOTE]
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Barrel erosion?
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