Won't fire a loaded round but will a primed case!!

[rvcoltold]

Savage model 12 F-class 6mm BR. This is a new build, never fired. Bolt close's tight. Anyone ever had this problem?

 

[Warren Dean]

That's weird.....

Both from the same brass batch?

A bit more info would help......

 

[rvcoltold]

Yes. Both from the same batch. It does have the accu-trigger. I am aware of closing the bolt too hard and all that. I have had the bolt apart and all seems well there. When it does not fire I can still here the hammer drop and it sounds like it should but no sign of a mark on the loaded round primer. What other information do you need?
The only thing different is the bullet is installed in one and not the other. Can I have the bullet too far into the lands and cause this? Can head space be too tight even if the bolt closes?

 

[michaelnel]

It may be the Accutrigger "safety" you hear. If you apply any side pressure to the Accutrigger, you will think it fired but the click you hear is the Accutrigger safety blocking the firing pin from falling. If you raise and lower the bolt handle it will cock again. It's a common problem with new shooters on Accutriggers, especially the Target version that is in your gun. The fact that you hear the click and yet there is no impression on the primer makes me believe this is what is happening.

Make sure you apply pressure straight back when pulling the trigger, or the safety will block you.

 

[rvcoltold]

This didn't happen just once. I have studied the safety feature of the Accu-Tigger. Remember this will fire with a primered case. I am not pulling the trigger different. I think it has something to do with binding the firing pin just don't know what.

 

[Ggmac]

Does it have new style firing pin (not adjustable) , is it a new action ? Replaced bolt head ? Does it close hard with no case ? Did you replace any of the firing mechanism,
I know all these questions seem odd , but your situation is perplexing.

 

[Ggmac]

You're not crimping your bullets are you?

 

[rvcoltold]

Nope. I don't see a way to adjust the firing pin. I bought the used action about 5 years ago and did put on a different bolt head. I recently bought a barrel and put it together. Closes easy with no round harder with one. Have not replaced the firing mechanism. I don't mind the questions at all. Hope this helps.

 

[Ggmac]

When you changed the bolt head , what caliber was it ? A magnum ? Did you change the bolt head retention pin ,the one the FP goes thru ? It doesn't fire any loaded cases ? Have you examined the primed case to the live round with a micrometer,at neck ,shoulder,and base? What happens when you load a previously fired ,primer fired case , with powder and bullet ,or pull a will not fire round apart and see if it fires ?
Puzzling, still trying, Gary

 

[SBS]

Do try seating the bullet deeper and make sure it is not touching the lands. If you still have the problem, I would check loaded neck diameter against the chamber (or the reamer print if available). Backwards pressure on the bolt can cause some funny things on the sear/cocking piece interface and the Accu-Trigger is not too forgiving in this area. And, while I know this sounds simplistic, make sure the bolt handle is ALL the way down, as failure to do so will slow the firing pin considerably.

 

[michaelnel]

Did you set the headspace with GO and NOGO gauges with the new bolt head?

 

[LHSmith]

The loaded rounds have the shoulder pushed back too far= too much H/S, the case just pushes forward as the firing pin drives it.

 

[fguffey]

There is a story going around the reloading forums that sounds almost believable.

If I told the story I would start the story with "Once upon a time". They say the case, powder and bullet out run the firing pin to the shoulder of the chamber. Their version of the story lead reloaders to believe the case, when driven forward by the firing pin stops when the case shoulder hits the chamber shoulder. After contact between the two shoulders the firing pin fires the primer.

I have killer firing pins, my firing pins crush the primer then everything gets serious. You do not have powder and or bullet, then there are two types of receivers, one is control feed and the other is push feed, that makes a lot of difference when we are talking about case stretch.

F. Guffey

 

[rvcoltold]

The Fix.
The replacement bolt head came stripped. I took the extractor out of my old 223 bolt head and used it in my now 6mm BR bolt head. It was too long and rubbing the action wall putting the firing pin in a bind. With a loaded round the bullet put enough more pressure on the side of the firing pin to stop it from reaching the primer or slowed it down. When I filed off .010" it worked fine.

SHOT SELF IN FOOT SO TO SPEAK

Thanks for all the help