R700 fail to fire 2X/10

masterduckmaster

masterduckmaster

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hello guys, got a slight issue here. went to the range today with my R700. fired about 10 rounds. 2 rounds out of 10 failed to fired. i checked the fail to fired rounds and notice the firing pin had only dented the primer slightly.
i am guessing the firing pin is striking fair enough. am i correct? if so, how do i fix this problem?

thanks!
 
Reloads? Primers fully seated?

Inspect the firing pin assy... is it clean?

Have you blown a primer recently? If so check to see if a bit of primer cup is not affecting the firing pin fall.

Has any stock work been done lately? Is the bolt fully closing? Does it have a little up and down movement in the fired position?
 
it was about -20.

This happened to both reload and factory load. i tried both.
The firing pin was clean for sure. what you mean by blown a primer?
the bolt was fully closed.
The only adjustment i have made recently is to loosen up the trigger pull (i has a adjustable trigger)

thanks!
 
masterduckmaster said:
what you mean by blown a primer?
Click to expand...

Inspect the firing pin assy... is it clean?

Some people refer to it as piercing a primer... although the firing pin does not pierce the primer, the primer cup fails and often blows a piece right out forcing the firing pin tip back... that leaves a hole in the primer and the missing piece from this hole blows back into the firing pin recess...
 
hum..i will take the bolt apart and clean it.
i just want to make sure adjusting the trigger sniffness shouldnt have any impact on the firing pin striking right?
 
guntech said:
Inspect the firing pin assy... is it clean?

Some people refer to it as piercing a primer... although the firing pin does not pierce the primer, the primer cup fails and often blows a piece right out forcing the firing pin tip back... that leaves a hole in the primer and the missing piece from this hole blows back into the firing pin recess...
Click to expand...

whats causing the "piercing a primer" though?

hum...i took the firing pin assembly out of the bolt thing. whole thing looks clean inside though.
 
masterduckmaster said:
whats causing the "piercing a primer" though?

hum...i took the firing pin assembly out of the bolt thing. whole thing looks clean inside though.
Click to expand...

Wash all the oil off the spring and pin with a solvent and dry it well. G96 gun treatment can be used as a lube. It is unaffected by cold.

A primer that fails rupturing into the firing pin hole is caused by a few things...

a pistol primer being used in a rifle
a poor fit of the firing pin and the hole
a sharp firing pin tip
a weak firing pin spring

Primers not being fully seated in a hand load is the biggest single cause of misfires I have seen. Seat them deep just short of deforming the cup.

If you contaminate a primer with oily fingers when seating the primer it can also 'kill' a primer.
 
guntech said:
Wash all the oil off the spring and pin with a solvent and dry it well. G96 gun treatment can be used as a lube. It is unaffected by cold.

A primer that fails rupturing into the firing pin hole is caused by a few things...

a pistol primer being used in a rifle
a poor fit of the firing pin and the hole
a sharp firing pin tip
a weak firing pin spring

Primers not being fully seated in a hand load is the biggest single cause of misfires I have seen. Seat them deep just short of deforming the cup.

If you contaminate a primer with oily fingers when seating the primer it can also 'kill' a primer.
Click to expand...

ahh i see. well, since this is happening to both reload and factory ammo. i think i can quite safely rule out its the ammo though. i will take the pin apart and clean it and see.

thanks!
 
Dogleg said:
I'm curious what adjustments you made on the trigger. Did you only work on the weight screw, or did you also try for absolute zero movement on the overtravel screw?
Click to expand...

This is a very good point... make sure your trigger has over travel that you can feel and see... if the over travel does not have clearance the sear may impede the cocking piece movement... which could affect ignition.
 
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