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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel fouling and groups
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<blockquote data-quote="luke5678" data-source="post: 467073" data-attributes="member: 30274"><p>I had a new remington sendero 7mm Mag for about a year. I broke in the barrel cleaning every shot for a box, then every 3 shots for the next two boxes.</p><p> </p><p>I now handload with IMR4350 (60.5g.), COAL 3.343, Nosler accubond 160s. For the first year my cleanbore shot was the same as the next 15. All .5 inch groups at 100. I understand this is unique.</p><p> </p><p>All of a sudden everything changed about two months ago. Now my groups have slid to .75 and my first couple of shots just go wherever. Then it settles down. I have a total of about 300 rounds through the gun.</p><p> </p><p>Why would this change? I clean my barrel every 20 shots. </p><p> </p><p>Second question: </p><p>It also seems that each time I clean my barrel my zero changes to a half inch low and half inch left. I reset my zero and shoot my groups. Next day, clean barrel and shoot again only to adjust the nightforce scope the same amount.</p><p> </p><p>The only thing I changed was last time trimming my brass to 2.480 where I used to just make sure it wasn't more than 2.5 and had variances. Will minor brass lengths make any difference? </p><p></p><p>Thanks</p></blockquote><p></p>
[QUOTE="luke5678, post: 467073, member: 30274"] I had a new remington sendero 7mm Mag for about a year. I broke in the barrel cleaning every shot for a box, then every 3 shots for the next two boxes. I now handload with IMR4350 (60.5g.), COAL 3.343, Nosler accubond 160s. For the first year my cleanbore shot was the same as the next 15. All .5 inch groups at 100. I understand this is unique. All of a sudden everything changed about two months ago. Now my groups have slid to .75 and my first couple of shots just go wherever. Then it settles down. I have a total of about 300 rounds through the gun. Why would this change? I clean my barrel every 20 shots. Second question: It also seems that each time I clean my barrel my zero changes to a half inch low and half inch left. I reset my zero and shoot my groups. Next day, clean barrel and shoot again only to adjust the nightforce scope the same amount. The only thing I changed was last time trimming my brass to 2.480 where I used to just make sure it wasn't more than 2.5 and had variances. Will minor brass lengths make any difference? Thanks [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel fouling and groups
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