Bolt bounce and Scope shift when dry firing

ShtrRdy

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Joined
Jan 14, 2012
Messages
2,638
Location
High Plains
And I do believe that it is affecting accuracy. IMO, there's got to be a mechanical reason for it.
There is a mechanical reason for it. But if you don't see it happen with a fired case chambered then this particular behavior is not likely a problem.

What sort of accuracy problem are you having?
 

CWM-RHG

Previously Chuck Moles
Joined
Aug 28, 2018
Messages
89
Location
Washington state
The gun shoots 3/8"groups all day long. the groups are always a horizontal line. the groups are pretty consistent from the middle then left of center.
 

jrock

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Joined
Mar 12, 2014
Messages
1,029
Tubbs makes a spring assembly that takes the bolt jump away.
 

MLN1963

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Joined
May 5, 2013
Messages
94
The bolt bounce is likely from the firing pin coil spring unwinding. As mentioned above, Tubb sells a dual wound spring to minimize that.
 

Shadowwalker

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Joined
May 23, 2018
Messages
74
Location
GiLMER TX
Your scope shouldn't be shifting. If its shifting under dry fire its definitely gonna shift with recoil when you do fire it.
Some scopes take 2 or 3 shots to "settle in" after adjusting.
If this is truly the case, I'd be getting me another scope real fast......
 

jrock

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Mar 12, 2014
Messages
1,029
That was my first impression after reading the same statement
 

416Taylor

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Joined
Oct 28, 2012
Messages
12
Location
Alaska
there are several mechanical reasons for bolt bounce. In no particular order they are:
1- firing spring (as previously mentioned) Several good options there.
2- most likely a bolt diameter issue. Keep in mind that when the bolt is placed in battery, there is upward spring pressure from the trigger sear. Any slop or tolerance is pushed up to the rear bridge of the action. upon firing the bolt is allowed to drop down causing the bolt handle to bounce. I generally see when there is several thousands or more of tolerance. i generally go for tight fitting bolts and I don’t see this issue.
3- as mentioned you could have a bolt timing issue. If the cocking piece is contacting the cocking ramp on its final journey forward it could cause the bolt to bounce. This is generally something that is way out of whack but can happen.
I may have missed something but I believe there are the big ones. overall, you have a good shooting rifle so it may be a thing to live with??
 

Flatbow

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Joined
Mar 3, 2015
Messages
228
Location
Rarhdrum ID
Your scope shouldn't be shifting. If its shifting under dry fire its definitely gonna shift with recoil when you do fire it.
Some scopes take 2 or 3 shots to "settle in" after adjusting.
I have never heard that a scope could take a shot or two to "settle in".
This is good info to have, thanks
 

jdyoung

Well-Known Member
LRH Team Member
Joined
Mar 1, 2020
Messages
102
Location
Ironman Country
there are several mechanical reasons for bolt bounce. In no particular order they are:
1- firing spring (as previously mentioned) Several good options there.
2- most likely a bolt diameter issue. Keep in mind that when the bolt is placed in battery, there is upward spring pressure from the trigger sear. Any slop or tolerance is pushed up to the rear bridge of the action. upon firing the bolt is allowed to drop down causing the bolt handle to bounce. I generally see when there is several thousands or more of tolerance. i generally go for tight fitting bolts and I don’t see this issue.
3- as mentioned you could have a bolt timing issue. If the cocking piece is contacting the cocking ramp on its final journey forward it could cause the bolt to bounce. This is generally something that is way out of whack but can happen.
I may have missed something but I believe there are the big ones. overall, you have a good shooting rifle so it may be a thing to live with??
3- as mentioned you could have a bolt timing issue. If the cocking piece is contacting the cocking ramp on its final journey forward it could cause the bolt to bounce.

When the bolt is rotated into battery, there is a milled flat/rest that is to contact the right side of the receiver rails. If that flat is too deep, the bolt rotates too far when in battery. This causes a misalignment between the sides of the sear on the cocking piece allowing it to rub/contact the straight side of the bolt cocking ramp when fired . The bolt then jumps into alignment with the cocking piece. Moreover , the rubbing robs some of the power of the striker spring slowin' the striker.
If your heart is beatin' like a rabbit, you want that striker to have all the speed it possesses so you can properly time the primer strike between beats.
 

Litrfoot

Active Member
Joined
Jan 9, 2019
Messages
40
Location
California
You might check your trigger. Make sure it is not touching the sides or front of the bottom metal! If it is you need to relieve the metal around it.
 

Magnett

Member
Joined
Dec 16, 2012
Messages
20
Can anyone help me out here? Getting used to the trigger on my gun. Its a Rem 700 thats been blueprinted, PTG bolt installed and lugs lapped, with a Proof steel barrel. Trigger Tech trigger set at 1# 3oz. Bolt bounces every time I dry fire it and scope POI shifts left 1/4" every time at 100 yds. Any ideas on what's the cause and how to eliminate this? Any help would be appreciated.

 

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