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Long Range Hunting & Shooting
Copper fouling after Losso use
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<blockquote data-quote="TAZMAN" data-source="post: 2690221" data-attributes="member: 1708"><p>So I have a 260 that I use to shoot matches and it has done very well. Usually shoots in the .3 range with H4350/142smk combo. Last week the groups opened up so I looked at it with a bore scope and noticed the fire-cracking has some pretty good carbon I couldn't get out. I used a small bit of Losso on a nylon bore tech brush after doing my normal bore tech patch and brush work then I flushed out the Losso and it looked clean with no 'grit" feeling from the dry patch. Looked good and it went back to shooting .3 inch groups but after 35 rounds the group opened way up.</p><p></p><p>I looked at it with he bore scope again and it has copper streaks everywhere in the barrel and it has never done that before. I used very little Losso and the barrel has about 2900 rounds through it so I suppose it could be getting close to the end of it's career but the copper fouling seems odd. I did not use enough Losso and strokes to hurt anything I didn't think but maybe I am missing a step to re-polish the bore. I tried a little JB bore past on a patch to polish it a little more then shot it yesterday and the same thing....35-40 round in 5 shot groups with 40 minutes between strings and it copper fouled then opened up. </p><p></p><p>Am I missing a step or is the barrel done?</p></blockquote><p></p>
[QUOTE="TAZMAN, post: 2690221, member: 1708"] So I have a 260 that I use to shoot matches and it has done very well. Usually shoots in the .3 range with H4350/142smk combo. Last week the groups opened up so I looked at it with a bore scope and noticed the fire-cracking has some pretty good carbon I couldn't get out. I used a small bit of Losso on a nylon bore tech brush after doing my normal bore tech patch and brush work then I flushed out the Losso and it looked clean with no 'grit" feeling from the dry patch. Looked good and it went back to shooting .3 inch groups but after 35 rounds the group opened way up. I looked at it with he bore scope again and it has copper streaks everywhere in the barrel and it has never done that before. I used very little Losso and the barrel has about 2900 rounds through it so I suppose it could be getting close to the end of it's career but the copper fouling seems odd. I did not use enough Losso and strokes to hurt anything I didn't think but maybe I am missing a step to re-polish the bore. I tried a little JB bore past on a patch to polish it a little more then shot it yesterday and the same thing....35-40 round in 5 shot groups with 40 minutes between strings and it copper fouled then opened up. Am I missing a step or is the barrel done? [/QUOTE]
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Copper fouling after Losso use
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