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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 RUM Sendero very inconsistent!
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<blockquote data-quote="Hired Gun" data-source="post: 567971" data-attributes="member: 1290"><p>I install a lot of brakes on 300 RUM's and I have seen this before. What size thread did your smith use on the brake? If it's a 5/8" or smaller overtightening the brake will put a constriction in your barrel right under the threads. The verify either loosen the brake or remove it entirely and test. If the accuracy returns then you can hand lap a bit off the back of your brake and reinstall with less torque and still maintain the timing. It also may not be installed concentrically. If it's off center your groups will be all over the place. </p><p></p><p>Your barrel should have lots of life left in it. To get max milage don't shoot it hot. 3 at a time is max before you let it cool. I have inspected them with only 60 rounds through them and they had 10 times more wear than my 700 round 300Wby has. When I told him that he said he was shooting 20 shot groups as he was getting frustrated with the accuracy and just kept shooting. With his new brake he has reported sub MOA accuracy and the recoil is down to 243 sporter levels.</p></blockquote><p></p>
[QUOTE="Hired Gun, post: 567971, member: 1290"] I install a lot of brakes on 300 RUM's and I have seen this before. What size thread did your smith use on the brake? If it's a 5/8" or smaller overtightening the brake will put a constriction in your barrel right under the threads. The verify either loosen the brake or remove it entirely and test. If the accuracy returns then you can hand lap a bit off the back of your brake and reinstall with less torque and still maintain the timing. It also may not be installed concentrically. If it's off center your groups will be all over the place. Your barrel should have lots of life left in it. To get max milage don't shoot it hot. 3 at a time is max before you let it cool. I have inspected them with only 60 rounds through them and they had 10 times more wear than my 700 round 300Wby has. When I told him that he said he was shooting 20 shot groups as he was getting frustrated with the accuracy and just kept shooting. With his new brake he has reported sub MOA accuracy and the recoil is down to 243 sporter levels. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 RUM Sendero very inconsistent!
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