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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Why does Barrel fowling spoil accuracy
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<blockquote data-quote="kranky" data-source="post: 672546" data-attributes="member: 50753"><p>Great post Kevin. I can relate. </p><p></p><p>A few years ago I took a group from my organization out to David Tubb for a week of shooting. One evening during the week I asked him about cleaning. His response was that most clean far too often and that every rifle has its own temperment when it comes to fouling. The next day he proved his point. We took our rifles and cleaned them and then shot through an Ohler. Each rifle was a bit different, but between 12-15 rounds all had a consistant velocity (.300 win mags, 190 and 220gr SMK). Before the 12-15 mark we witnessed 120fps differences in some rifles! I did the same experiment with my custom 338 Lap and my handloads through my PVM and had the same results. It was starting to make sense when confirming a zero after cleaning some of my work rifles, I could literaly watch the impacts walk right back to the origional zero. For the past few years I have only run a patch through my barrel after a day of shooting, or cleaned and fouled if the threshhold of that particular barrel had been met, for this effort my rifles have been far more predictable and accurate.</p><p></p><p>Tubb on the subject of cleaning itself- When you clean.....CLEAN!, use an aggressive compound that will get all the copper out of the barrel. He used Sweets 7.62 and an oversized bore brush on his rifles and said just be sure to get it all out. I think he cleaned every 200-300 rounds on .30 cal and above.</p><p></p><p>Just thought you guys might want the professional opinion of an 11 time national champ.</p></blockquote><p></p>
[QUOTE="kranky, post: 672546, member: 50753"] Great post Kevin. I can relate. A few years ago I took a group from my organization out to David Tubb for a week of shooting. One evening during the week I asked him about cleaning. His response was that most clean far too often and that every rifle has its own temperment when it comes to fouling. The next day he proved his point. We took our rifles and cleaned them and then shot through an Ohler. Each rifle was a bit different, but between 12-15 rounds all had a consistant velocity (.300 win mags, 190 and 220gr SMK). Before the 12-15 mark we witnessed 120fps differences in some rifles! I did the same experiment with my custom 338 Lap and my handloads through my PVM and had the same results. It was starting to make sense when confirming a zero after cleaning some of my work rifles, I could literaly watch the impacts walk right back to the origional zero. For the past few years I have only run a patch through my barrel after a day of shooting, or cleaned and fouled if the threshhold of that particular barrel had been met, for this effort my rifles have been far more predictable and accurate. Tubb on the subject of cleaning itself- When you clean.....CLEAN!, use an aggressive compound that will get all the copper out of the barrel. He used Sweets 7.62 and an oversized bore brush on his rifles and said just be sure to get it all out. I think he cleaned every 200-300 rounds on .30 cal and above. Just thought you guys might want the professional opinion of an 11 time national champ. [/QUOTE]
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Why does Barrel fowling spoil accuracy
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