Bolt movement on trigger pull

[_Raining]

What is the cause of the bolt handle moving or shaking when the trigger is pulled? Is it normal or does it point to a specific problem?

 

[dminn1]

http://forum.accurateshooter.com/threads/bolt-handle-jump.3931946/ Check out this thread. Hope this helps.

 

[Ggmac]

What action ?

 

[fatelvis]

 

[watercam]

Since I installed Tubbs Duo Springs my bolt just lies there. No ignition issues at all. Can not say the rifle is any more or less precise but it is one less moving part during ignition.

 

[_Raining]

What action ?

Defiance Bolt jiggles on dry fire, Tikka Bolt drops on dry fire and IIRC on live fire. I have not checked my Rem 700.

 

[mauser284]

This is window dressing more than anything else in terms of the springs by themselves. Since he does not cover what he has done to the firing pin all is suspect. The bolt moving when fired is a symptom not the actual problem. To solve the actual problem you need to make the lugs not a caming surface and take the 20lbs. or so of spring force off the lugs. The only way to do that on a Remington well is to do a double sleeved bolt to do what the Borden Bumps do. This is very much like putting a cast on a broken leg to heal the leg but not addressing the true cause of the break Rickets. The leg will deform or break again once the cast is removed if it even heals right because the cast is not addressing the underlying disease that cast the leg bone to break! Likewise the rotation of the firing pin is not the problem in fact the rotation of the firing pin could be seen as a good thing. If you ask the wrong question than no matter how correct the answer is it is still the wrong solution because it is solving a symptom not the actual problem!

I do not understand how so many educated people could be so ignorant of what is a simple machine that is well understood with 100% of the engineering and math being fully known and understood and available in hundreds if not thousands of out of print books on this subject. It is hard work to machine and double sleeve a rifle bolt and or to design a custom action that actually solves the real issues well known to be at play in the Mauser dual opposed vertical rifle locking lug design. 99% of the gun buying public have no clue so no demand. It is also much more expensive to design a rifle that does not have these tendencies. That is why I laugh at most custom actions that do not address this.

The reason we machine the locking lug recesses and lap bolts is to reduce this tendency for cocked opposed bolt lugs not to sit square to the locking lug recesses due to the force of the firing pin spring. One of the purposes of really fat bolt bodies is to mitigate some of this. The design and engineering that goes into a bolt gun today is not much more complicated than designing a hammer. It is not "Rocket Science". By the time you see the bolt move the bullet has long since left the barrel.

Most of the industry is counting on the customer to be ignorant of actual engineering and expects them to buy based on marketing and perceived benefits. Machining is expensive, time consuming and requires skill. A spring kit though is like a license to print money since you can sell those like hot cakes and almost anyone can swap out a firing pin and springs. Notice in this video the handle still moves after firing with his firing pin and springs in place it just moves less. The wiggling can not be eliminated with springs and firing pin swap because it is not the problem it is the symptom! LOL

 

[BoydAllen]

This is window dressing more than anything else in terms of the springs by themselves. Since he does not cover what he has done to the firing pin all is suspect. The bolt moving when fired is a symptom not the actual problem. To solve the actual problem you need to make the lugs not a caming surface and take the 20lbs. or so of spring force off the lugs. The only way to do that on a Remington well is to do a double sleeved bolt to do what the Borden Bumps do. This is very much like putting a cast on a broken leg to heal the leg but not addressing the true cause of the break Rickets. The leg will deform or break again once the cast is removed if it even heals right because the cast is not addressing the underlying disease that cast the leg bone to break! Likewise the rotation of the firing pin is not the problem in fact the rotation of the firing pin could be seen as a good thing. If you ask the wrong question than no matter how correct the answer is it is still the wrong solution because it is solving a symptom not the actual problem!

I do not understand how so many educated people could be so ignorant of what is a simple machine that is well understood with 100% of the engineering and math being fully known and understood and available in hundreds if not thousands of out of print books on this subject. It is hard work to machine and double sleeve a rifle bolt and or to design a custom action that actually solves the real issues well known to be at play in the Mauser dual opposed vertical rifle locking lug design. 99% of the gun buying public have no clue so no demand. It is also much more expensive to design a rifle that does not have these tendencies. That is why I laugh at most custom actions that do not address this.

The reason we machine the locking lug recesses and lap bolts is to reduce this tendency for cocked opposed bolt lugs not to sit square to the locking lug recesses due to the force of the firing pin spring. One of the purposes of really fat bolt bodies is to mitigate some of this. The design and engineering that goes into a bolt gun today is not much more complicated than designing a hammer. It is not "Rocket Science". By the time you see the bolt move the bullet has long since left the barrel.

Most of the industry is counting on the customer to be ignorant of actual engineering and expects them to buy based on marketing and perceived benefits. Machining is expensive, time consuming and requires skill. A spring kit though is like a license to print money since you can sell those like hot cakes and almost anyone can swap out a firing pin and springs. Notice in this video the handle still moves after firing with his firing pin and springs in place it just moves less. The wiggling can not be eliminated with springs and firing pin swap because it is not the problem it is the symptom! LOL

Do you know how the double spring setup works? Have you swapped out a regular spring for one and compared? I have one, on a custom action, with close clearances and correct geometry. Perhaps we are not all as ignorant as you seem to think.