GOOD Lapua Brass

[CaptainMal]

Did something really stupid. Fireformed over 100 pieces of 6 Dasher without jamming or doing a "false shoulder". Stupid me. I used a 6 BR case on the Hornady/ Stony Point tool to measure leade. Took that measurement and added .030" to set the fireform bullets to jam.

Yesterday the gun builder met me to see why the gun would not shoot. I had leade measurements over .050" short with my idiotic measuring the past 4 months. Sure the gun is not shooting well with .070" or more jump. but the fireforming should have blown heads off the cases as they were NOT jammed and probably actually jumped .020" or more during fireforming.

I'm the idiot. Let's get past that for now. Better check the cases for impending head separation. NONE. All is good with the brass. Here's how I checked for any thin/weak spots.

Good Lapua brass. Not a hint of thinning in the head.

Dumb luck.

 

[jhord]

OOOOPS!!! ;D But truthfully I might have done the same thing. Looks like you get some more trigger time to fireform those cases again...

 

[Larryh128]

I takes a pretty good man to admit his mistakes & then post them. ;D

 

[artbosco]

If ever I have qualms or doubts about the condition of brass that I'm preparing, which relates to safety, even after measuring, I throw the brass away and consider its expense the cost of tuition or the cost of learning, on how to form it correctly. It's not worth the pennies or dollars saved worrying about the efficacy of the brass's condition or quality.

As far as jam is concerned, I seat my 6PPC bullets so I see a square mark on the jacket just in front of the neck/bullet junction. I visually check jam with a dummy round, adjusting the seater outward till I see my desired mark. No math or measurement miscalculating or reading error ... because I can see the end result.

I also remove the firing pin assembly from the bolt [there's no peripheral tension introduced by the spring] so I can feel a little bullet crunch when seated. It also allows me to tell if I've adjusted my die correctly and have pushed the shoulder back enough. If upon full chambering, the bolt hangs up and I can push it into its full down position with very little effort [it almost falls into position through gravity] I know that I've set my die correctly.

 

[6BRinNZ]

where did you get that tool from? I am in the same camp as outdoorsman, but hey I measure everything else. LOL....seriously can you get it from sinclair or reddings?

 

[artbosco]

where did you get that tool from? ... seriously can you get it from sinclair or reddings?

That's the RCBS Case Master. Do a Google search for the best price.

 

[6BRinNZ]

where did you get that tool from? ... seriously can you get it from sinclair or reddings?

That's the RCBS Case Master. Do a Google search for the best price.

Thanks!

 

[CaptainMal]

Gonna trust the Case Master tool. Could not find any issue, anywhere after checking maybe 40 pieces of the 110 I fireformed and used.

Thanks for the ideas. Agree with another comment.

"Life is hard when you're dumb".