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Rifles, Reloading, Optics, Equipment
Gunsmithing
Does slop between barrel and action threads affect accuracy?
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<blockquote data-quote="25WSM" data-source="post: 1789737" data-attributes="member: 38048"><p>I think the word slop is what is confusing people here. I make my barrel tennon .001 to.002 smaller than the receiver. When the receiver will just about go on by hand without force I dial in another .001 and cut it again. If the receiver goes on smoothly with no force it's done if it has any felt resistance going on it gets another . 001 until it goes on smoothly. I don't call it slop. It's the amount of play I believe it needs to face up correctly. When you screw the receiver almost all the way on and you can't move the rear of the action side to side a little then when the 2 faces match up the shank is going to be forced to one side and create tension. The only actions that can have a tighter fit are custom actions that have perfect thread alignment to the bore and face. Or if you fully blueprint the receiver which would include recutting the threads and face. Even one these perfect receivers I want my barrel to go on with no force. </p><p>JE the example of a tight thread holding the barrel from moving side to side on the face has no merit. A proper thread does not touch the root of the groove which means your counting on thread faces to hold the barrel from moving to the side. When you tighten the barrel in a vise the threads pull tight and the back of the threads don't touch any more. It's all on one face of the threads. And the two angles pulling on each keep it centered. A slightly looser thread would just have . 001 to . 002 less face to pull against. And as I stated before I've seen guns that shoot lights out that had barrels fitted so loose I couldn't beleive it. Alot of custom benchrest Smith's keep your dimensions so you can order another barrel without sending your rifle to them. They are not cutting a thread so tight that it might not go on by hand. They have a little play in them. I've been around them way too much to know. I build 100/200 yard bench guns as well as 1000 yd bench guns. And know many Smith's from shooting compatition and we all talk shop. I enjoy my conversation with them because we all know what each other are saying without explanation. This question has come up before and you know where I stand on it. I'm not alone on my position.sorrh for the long post.</p><p>Shep</p></blockquote><p></p>
[QUOTE="25WSM, post: 1789737, member: 38048"] I think the word slop is what is confusing people here. I make my barrel tennon .001 to.002 smaller than the receiver. When the receiver will just about go on by hand without force I dial in another .001 and cut it again. If the receiver goes on smoothly with no force it's done if it has any felt resistance going on it gets another . 001 until it goes on smoothly. I don't call it slop. It's the amount of play I believe it needs to face up correctly. When you screw the receiver almost all the way on and you can't move the rear of the action side to side a little then when the 2 faces match up the shank is going to be forced to one side and create tension. The only actions that can have a tighter fit are custom actions that have perfect thread alignment to the bore and face. Or if you fully blueprint the receiver which would include recutting the threads and face. Even one these perfect receivers I want my barrel to go on with no force. JE the example of a tight thread holding the barrel from moving side to side on the face has no merit. A proper thread does not touch the root of the groove which means your counting on thread faces to hold the barrel from moving to the side. When you tighten the barrel in a vise the threads pull tight and the back of the threads don't touch any more. It's all on one face of the threads. And the two angles pulling on each keep it centered. A slightly looser thread would just have . 001 to . 002 less face to pull against. And as I stated before I've seen guns that shoot lights out that had barrels fitted so loose I couldn't beleive it. Alot of custom benchrest Smith's keep your dimensions so you can order another barrel without sending your rifle to them. They are not cutting a thread so tight that it might not go on by hand. They have a little play in them. I've been around them way too much to know. I build 100/200 yard bench guns as well as 1000 yd bench guns. And know many Smith's from shooting compatition and we all talk shop. I enjoy my conversation with them because we all know what each other are saying without explanation. This question has come up before and you know where I stand on it. I'm not alone on my position.sorrh for the long post. Shep [/QUOTE]
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Does slop between barrel and action threads affect accuracy?
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