Help with firingpin

[blawton]

Some of the AI chamber reamers and gauges are setup to already bump the unformed case shoulder in the chamber so the round stays in place when forming. Thats not always the case though.

It just seems to me that the firing pin is rubbing against sometimes causing a inconsistent strike. If you are using already formed brass then you might be able to size the shoulders down far enough to cause this problem but then you would see crimps in the brass if you are pushing it that far back. Use a piece 40 s&w to measure how much difference you have between the fired and unfired stuff. Just measure the OAL the pistol case square on the shoulders and it will let you know the difference in your HS.

 

[p17enfeild]

robert

P17,

Not sure to read correctly the last sentence..It goes against all what I have always learned about gauging..

Are you also sure 30-06 standard gauges are useable for 30-06 AI?....

R.G.C

my 30-06 std or spigflield go gauge mesures the same as my 30-06ackly no-go at the same diameter ie .400''

id you read dave manson info you see why

 

[Octopus]

Seating bullets longer, into the lands is usually my practice for fire forming.

For fire forming I have found that lubrication on the brass helps give a more uniform result. Most good sizing lubs work.

 

[wapiti25]

I do my own chambering and have built two std 6.5-06's. My chamber for any improved cartridges would be short by a few thousands so new unfired cases would be tight on the head space as you have a very small contact point on new cases or as stated by others you need to neck-up. I like 30-06 as it also gives you more brass to turn necks. 35 Whelen is also brass that you would get more of a shoulder. Try H1000 with heavy bullets im having good luck in the std 6.5-06.

 

[Robert]

I do my own chambering and have built two std 6.5-06's. My chamber for any improved cartridges would be short by a few thousands so new unfired cases would be tight on the head space as you have a very small contact point on new cases or as stated by others you need to neck-up. I like 30-06 as it also gives you more brass to turn necks. 35 Whelen is also brass that you would get more of a shoulder. Try H1000 with heavy bullets im having good luck in the std 6.5-06.

Wapiti,

Not only that, but it is not to forget that expanding the shoulder results in a retractation of the metal ahead of it, and the bigger diameter original neck helps a lot to reduce or eliminate this.

R.G.C

 

[Joe O]

This is a good discussion. I'm having a AI being built,and will send virgin brass with necks turned to fit a .270 neck on a .243 AI,plus send a case with bullet seated for my longest and shortest bullets.I'm looking for a crush fit on the shoulder/neck junction,and not need to jam the bullet into the lands for fireforming.
Thanks

 

[Robert]

This is a good discussion. I'm having a AI being built,and will send virgin brass with necks turned to fit a .270 neck on a .243 AI,plus send a case with bullet seated for my longest and shortest bullets.I'm looking for a crush fit on the shoulder/neck junction,and not need to jam the bullet into the lands for fireforming.
Thanks

Joe,

Not too much crushing. A rifle chamber is not FL sizing die on a Rockcker...And moreover here you make the work with no lube...

Close fit to contact shoulders

R.G.C

 

[Joe O]

This is a good discussion. I'm having a AI being built,and will send virgin brass with necks turned to fit a .270 neck on a .243 AI,plus send a case with bullet seated for my longest and shortest bullets.I'm looking for a crush fit on the shoulder/neck junction,and not need to jam the bullet into the lands for fireforming.
Thanks

That was my incorrect terminology.Jim Hart will set it up with the case shoulder as it should be.I just want to be able to shoot loads with bulletas seated off the lands,to PD shoot and form at the same time

Joe,

Not too much crushing. A rifle chamber is not FL sizing die on a Rockcker...And moreover here you make the work with no lube...

Close fit to contact shoulders

R.G.C

 

[blawton]

Seating bullets longer, into the lands is usually my practice for fire forming.

For fire forming I have found that lubrication on the brass helps give a more uniform result. Most good sizing lubs work.

That might help to use lube but when you do that you loose all brass grip that you have in the chamber. The result is a over expanded case because all the force was applied directly to the bolt head. This is never good to do.

 

[queen_stick]

I've been fireforming for my 6Dasher the past few days. I was upset at first, as 3/4 of my rounds were misfires. after a struggle to figure out what it was, it ended up being the primer seating. I didn't have them seated far enough, just like mentioned in one of the posts on the first page of this thread. Haven't had any issues since I started seating the primers hard into the pockets.

I loaded a 25-06 for years (that's also the round I used to learn how to reload!). I probably shot 5k or 10k handloads out of that thing, all made by me. In all of those reloads, which includes my rookie reloading years, I had one misfire. The primer was the culprit - not seated deep enough.

 

[kjcpoint]

Add .004 to your standard go guage for an ai chamber and your crush fit will be right on.

kyle

 

[RJinTexas]

I do not believe you have a firing pin problem. " Light crush explained" First you need to remove your firing pin assembly and the ejector from your bolt when checking for a slight crush fit, this allows you actually feel what's happening. Always use the correct go-gauge. I like my bolt handle to fall somewhere around half way down yet require me to apply light pressure to finish closing the bolt. When this is done correctly you'll no longer need to jam the bullets because the brass case is snugly fit between the bolt face and the chamber shoulder. As others has already stated if your using a standard 30-06 go gauge you already have set up excessive head space. In fact your std 30-06 go gauge should in fact work as a no-go gauge for your AI chamber. I learned these methods from others (catshooter comes to mind - here kitty,kitty,kitty) right here on 6mmBR. I've followed these methods whenever I'm head spacing all AI chambered barrels and/or going to be fire forming brass and have never run into difficulties. PLEASE DO NOT FIRE FORM USING LUBED BRASS IN YOUR CHAMBER IT'S UNSAFE. If anyone sees fault in my direction please fill free to correct me.

Regards
RJ

 

[BillPa]

Add .004 to your standard go guage for an ai chamber and your crush fit will be right on.

kyle

HUH?

The GO for a rimless bottle cartridge is already .004" longer. Besides, the shoulder of the parent cartridge in an improved chamber doesn't make contact at all, only neck-shoulder junction with a ".004" crush ftt. Provided the barrel was chamber correctly its how the "Head Clearance", or lack of it in this instance is established chambering and firing the parent in an improved chamber.

Bill

 

[kjcpoint]

ok, chamber the ai and leave a .004 gap between shoulder on barrel and reciever with the go gauge in the chamber and the bolt closed. perhaps you would use a feeler guage to tell you .004. i have yet to see any misfiring issues with a good crush fit, and .004 out will give you that.

kyle