Crosshair jump while dry firing

G

gunsmoke77802

Guest
I usually dry fire a bit before live fire just to settle in. I have 2 Panda's that I can see about a 1/2" jump of the scope crosshairs when I pull the trigger. One is worse than the other. My Neskia Bay K action doesn't jump at all. I faintly remember a article a ways back in PS about this but can't remember the particulars. Is this anything to be concerned about? When I send one in soon to get re-barreled is it something to bring to the gunsmiths attention?
 
A man goes to the Doctor and says, "it hurts when I do this". The Doctor says, "then don't do that".

In short, don't don't look through your scope when you dry fire. Problem Solved........jackie
 
Words of extreme wisdom Jackie.

I am starting to look away from some things I saw as must do's. But why when I dont do them I shoot as well or better ?.. Another thing that makes yah go HMMMM ..

Andy B
 
I have a question for gunsmoke, which one shoots better? The article you are looking for was written by Speedy if I recall correctly and it had to do with the front bag being packed to tight with sand.
 
Good Point, John. You should make it a habit to at least every other relay "fluff up" that front bag. For what ever reason, a rock hard front bag seems to cause verticle........jackie
 
Leave a spent case in the rifle and try it. It probably won't jump then.

Mike
 
The spent case trick works to some extent, and it only works once. Once you crush that spent primer, the firing pin no longer falls on a soft target. It then falls and is stopped as if falling on case without a primer.

The bolt is held in place by the fired cartridge in the chamber, this cartridge no doubt fits your chamber snug. Without that cartridge there, the bolt would be a hair loose the once the firing pin begins to fall. This looseness would cause a vibration that is seen in the scope, a vibration that is not there when a round is fired.

Speaking of vibration, you mentioned that you see this in 2 Pandas, but not in the Nesika. Yet you didn’t say what stocks those rifles are sitting in. Some stocks are deader (softer) than others. It would be interesting to know what stocks each of those rifles have.

Firing pin extrusion is generally set about .055. How much of that .055 is actually taken up when falling on a live round. Once the primer is detonated, the pressure builds and pushes the firing pin rearward, probably before it hits the forward stopping point. The primer is pushed back to the bolt face, the detent made by the firing pin is flattened some and the firing pin never settles on that forward stopped position (.055) when falling on an actual live round. How do we know? Measure the placement of the cocking piece in relation to the bolt shroud after firing a live round, compared to the placement after falling on an empty chamber. Believe it or not falling on a live round is a soft (dampened) landing, and falling on an empty chamber is a hard impact.

So (as Jackie said) if your scope jumps when falling on an empty chamber, don’t do that.

Paul
 
A point to remember.....When dry firing, the clearance at the front of the bolt handle to action notch is sufficient to allow the bolt to move forward enough to hit the cone in the barrel. Bolt to cone clearance should be less than .010 in. and the gap between the bolt handle and the notch is more than that. If you have a nicely polished cone on the barrel surface, you will soon see a mark where the bolt strikes the cone if you repeatedly dry fire. This may be why the bolt handle jumps up on some actions when dry firing. Of course with a chambered round in place this doesn't happen.
Gene
 
Roy if you are talking about he electronic primers I have often wondered and many times started to post only deleting before I allowed ,,,,, why we dont try using those in BR. I wondered if there was a clause in the rules that forbade it? Or if no one had bothered trying it,,, or they all just figured it would not make any realistic diff. Maybe even we cant by those primers... dont know just always wondered.
 
No non-mechanical fireing mechanism

Read the rule book...this was hashed out in the 70's....under B.Definitions ...then Heavy Varmint....it is defined.....hope this answers the ??...Roger
 
What ? You don't think Jackie would look good in one of those white Jackets and a stethascope around his neck...... Ha Ha
 
expiper said:
Read the rule book...this was hashed out in the 70's....under B.Definitions ...then Heavy Varmint....it is defined.....hope this answers the ??...Roger
Click to expand...

From the IBS rule book: "Electric triggers are allowed."

Cheers,
Keith
 
On a serious note.... If you want reality just use some live primers cheap or other wise even gives you a bang in a small room to simulate the big bang. Shouldnt be hear outside the house much unless you are on the front with a window.

ON a lighter note....as long he shoots as good as he does Jackie looks good in just about anything except...hmm :confused: except maybe a :rolleyes:......:eek:thong....ayyyyyy;)
 
Was hoping you would say maybe a Hula Skirt or something but a THONG.... Well maybe a THONG and his machine shop work shirt would work.....

NOT!!!
 
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