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Rifles, Reloading, Optics, Equipment
Gunsmithing
Bolt Jump
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<blockquote data-quote="ultraedge" data-source="post: 843337" data-attributes="member: 36257"><p>I have seven customs built on l.a. Remington 700 actions. Four of these originally were Senderos in .300ultra just as you described. I had trouble with several not grouping unless I held them a certain way. I discovered that when dry firing those that gave trouble, the crosshair would jump. The group that shot well with a light hold, when dry fired , did not show any crosshair movement. I experimented with changing the firing pin and spring assembly until I got rid of the jump. Now all of the rifles group well using a light hold. </p><p> On another note, some of these firing pin and spring assemblies were j-lock type and some were not. I could not tell any accuracy difference between the two. Gary</p></blockquote><p></p>
[QUOTE="ultraedge, post: 843337, member: 36257"] I have seven customs built on l.a. Remington 700 actions. Four of these originally were Senderos in .300ultra just as you described. I had trouble with several not grouping unless I held them a certain way. I discovered that when dry firing those that gave trouble, the crosshair would jump. The group that shot well with a light hold, when dry fired , did not show any crosshair movement. I experimented with changing the firing pin and spring assembly until I got rid of the jump. Now all of the rifles group well using a light hold. On another note, some of these firing pin and spring assemblies were j-lock type and some were not. I could not tell any accuracy difference between the two. Gary [/QUOTE]
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