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<blockquote data-quote="NVGuide" data-source="post: 2232679" data-attributes="member: 119078"><p>My humble 2 cents…</p><p>If you are shooting a Christensen Arms rifle (doesn't matter what model) that came with a scope base rail already attached, insure that the base is secure. I dealt with the exact issue you described earlier today on my Christensen MPR .338 Lapua. 4 of 6 rounds during my load development in one ragged hole and an 2 approx 3/4 out in various directions. This happened with 3 separate targets. </p><p>I have built and developed custom loads for 6 different Christensen Arms guns over the past 2 years and every single one of them developed a loose scope rail around the 50-75 round mark. I confirmed torque settings on every one of them before mounting my scopes when they were brand new. </p><p>Remove the rail and most likely you will also find that it does not perfectly mate to the receiver. That is easily fixed by scuffing the rail where it contacts the receiver and putting an extremely thin layer of 5 min epoxy on the rail on the contact areas, set the rail on the receiver when the epoxy just starts to stiffen up and torque all screws to 5in lbs. Lay a straight edge on top of the rail and make screw adjustments until the rail is perfectly straight. Leave it overnight and then remove, loctite and replace the screws at the recommended torque settings. Wipe your receiver with a silicone gun cloth prior to epoxying the rail to ease removal in the future should it become necessary. </p><p>Hope this helps your groups like it did mine.</p></blockquote><p></p>
[QUOTE="NVGuide, post: 2232679, member: 119078"] My humble 2 cents… If you are shooting a Christensen Arms rifle (doesn’t matter what model) that came with a scope base rail already attached, insure that the base is secure. I dealt with the exact issue you described earlier today on my Christensen MPR .338 Lapua. 4 of 6 rounds during my load development in one ragged hole and an 2 approx 3/4 out in various directions. This happened with 3 separate targets. I have built and developed custom loads for 6 different Christensen Arms guns over the past 2 years and every single one of them developed a loose scope rail around the 50-75 round mark. I confirmed torque settings on every one of them before mounting my scopes when they were brand new. Remove the rail and most likely you will also find that it does not perfectly mate to the receiver. That is easily fixed by scuffing the rail where it contacts the receiver and putting an extremely thin layer of 5 min epoxy on the rail on the contact areas, set the rail on the receiver when the epoxy just starts to stiffen up and torque all screws to 5in lbs. Lay a straight edge on top of the rail and make screw adjustments until the rail is perfectly straight. Leave it overnight and then remove, loctite and replace the screws at the recommended torque settings. Wipe your receiver with a silicone gun cloth prior to epoxying the rail to ease removal in the future should it become necessary. Hope this helps your groups like it did mine. [/QUOTE]
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