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My 7saum by Hawk Hill Custom
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<blockquote data-quote="trebark" data-source="post: 1122579" data-attributes="member: 19172"><p>After some struggles resolving a mystery, my big cannon rifle is finally performing well!</p><p></p><p>The mystery was that no matter what I tried, I could not get a load to shoot faster than 2750 without showing pressure signs. The resolution turned out to lap the barrel a few more strokes because the barrel was cut exactly .2840 and it needed to be .2841. Seems hard to believe but .0001 was the difference between 2750fps and 3000fps.</p><p></p><p>With the mystery solved, the rifle has performed very well. It now shoots the 180grain Berger Hybrids at 3000fps into .5moa or better groups. Here's the load data:</p><p></p><p>Bullet: 180grain Berger Hybrid</p><p>Powder: 66grains Retumbo</p><p>Brass: Nosler</p><p>Primer: F215M</p><p></p><p>Have shot the rifle out to 625 yards so far. It is amazing! Shooting those 180 bergers really fast, they just slip threw the wind! Looking forward to deer season when it opens up in mid-November.</p></blockquote><p></p>
[QUOTE="trebark, post: 1122579, member: 19172"] After some struggles resolving a mystery, my big cannon rifle is finally performing well! The mystery was that no matter what I tried, I could not get a load to shoot faster than 2750 without showing pressure signs. The resolution turned out to lap the barrel a few more strokes because the barrel was cut exactly .2840 and it needed to be .2841. Seems hard to believe but .0001 was the difference between 2750fps and 3000fps. With the mystery solved, the rifle has performed very well. It now shoots the 180grain Berger Hybrids at 3000fps into .5moa or better groups. Here's the load data: Bullet: 180grain Berger Hybrid Powder: 66grains Retumbo Brass: Nosler Primer: F215M Have shot the rifle out to 625 yards so far. It is amazing! Shooting those 180 bergers really fast, they just slip threw the wind! Looking forward to deer season when it opens up in mid-November. [/QUOTE]
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