My first 6BRA arrives tomorrow

[Nature Boy]

I do believe that's HWY31 West rifle range

Good eye

 

[Nature Boy]

I switched over to CCI 450 primers for the next 50 fire forming loads and had 22 fail to go off. My thought is it’s a combo of case fitting a little loose in the chamber and the magnum primers being a little less sensitive. I struck each one twice. None would fire

What do you guys think?

 

[pat fulghum]

Too loose in chamber? Stick a piece of thin paper between bolt face and case head

 

[pat fulghum]

Anybody see anything wrong with this picture?

That bolt looks fully closed to me and people downrange...hmmm

 

[Nature Boy]

Too loose in chamber? Stick a piece of thin paper between bolt face and case head

Or load them to jam instead of jump?

 

[Nature Boy]

Anybody see anything wrong with this picture?

That bolt looks fully closed to me and people downrange...hmmm

Thanks for pointing that out Pat

 

[mikeeg02]

Did you pull the bullets and be certain they had powder in them?

Not being malicious. We all do it. Myself included.

 

[Nature Boy]

Did you pull the bullets and be certain they had powder in them?

Not being malicious. We all do it. Myself included.

Haven’t pulled them yet but 100% sure they all had powder. Primers did not ignite

 

[Alex Wheeler]

Check your firing pin fall. That primer strike looks light to me

 

[Curious]

My thought is it’s a combo of case fitting a little loose in the chamber

None of your factory 6BR brass should be loose in the chamber.

A 6BRA should have a 0.004" crush at the neck/shoulder junction which is common with all Ackley derivatives, this prevents the case from moving at all during firing and means we dont need to jam bullets during fire forming.

This is a new rifle, I would suggest you send it back for the builder and ask him to fix it.

 

[KenOath]

I switched over to CCI 450 primers for the next 50 fire forming loads and had 22 fail to go off. My thought is it’s a combo of case fitting a little loose in the chamber and the magnum primers being a little less sensitive. I struck each one twice. None would fire

What do you guys think?

I’ve had the same problem with two BRA barrels, I switched to br4s and jamming slightly, still had a few that didn’t fire, so changed to 400s and jamming .020” will see how they go only have 14 left to ff..

 

[KenOath]

Check your firing pin fall. That primer strike looks light to me

Where would I measure firing pin fall, the amount of pin petruding through the boltface??

 

[Nature Boy]

Where would I measure firing pin fall, the amount of pin petruding through the boltface??

My question as well

 

[tmwinds]

Did you use new factory brass? Did you size and bump the shoulders back? If your chamber is correct and your brass is correct you should have a slight resistance when closing the bolt. Firing pin fall is measured at the shroud. It is the difference between the location of the firing pin base in the cocked position and fired position. Alex Wheeler is much better qualified than I to tell you if it is adequate and how to correct it.

 

[Alex Wheeler]

If the fall is ok, then Id say your primers are suspect.

 

[WyleWD]

You might want to take the bolt apart and check to see if there is anything holding the pin from dropping all the way. If there are no little critters in there, clean it well, and get the pin drop checked and fixed if needed. Do you know for sure what your headspace is? It should be checked also. JME.WD

 

[geraldgee]

If the fall is ok, then Id say your primers are suspect.

Great info and vid. Thank you.

 

[Nature Boy]

Did you use new factory brass? Did you size and bump the shoulders back? If your chamber is correct and your brass is correct you should have a slight resistance when closing the bolt. Firing pin fall is measured at the shroud. It is the difference between the location of the firing pin base in the cocked position and fired position. Alex Wheeler is much better qualified than I to tell you if it is adequate and how to correct it.

New brass. The only thing I did was chamfer the mouths. Some of the brass has a slight resistance and some not much at all

I’m watching Alex’s video now

 

[Sheldon N]

I switched over to CCI 450 primers for the next 50 fire forming loads and had 22 fail to go off. My thought is it’s a combo of case fitting a little loose in the chamber and the magnum primers being a little less sensitive. I struck each one twice. None would fire

CCI450's have a harder cup and can push the case forward on fire forming, I've had failure to fire before with Dasher brass and 450 primers, even with false shoulder + jam. I use Fed 205's for fireforming since they have a softer cup.

 

[KenOath]

If the fall is ok, then Id say your primers are suspect.

Excellent info cheers, I’ll be checking my pin fall tonight.
The other thing I thought it may be was the chamber is set up for crush on a go gauge and I thought maybe some of the new Lapua 6br brass was actually shorter so there was no crush on the new brass??