Time to make the donuts....

[CJ6]

Now that's High Cotton......

 

[D Coots]

Al, is that common for 30's? Never had to push cores in on 6's.

Later
Dave

 

[AlNyhus]

Al, is that common for 30's? Never had to push cores in on 6's.

Later
Dave

Morning, Dave. The Hood .30 cores I've got here run right at .2598 on average. Due to the jackets taper, they don't plunk right down to the bottom of a J4 .925 or 1.00 jacket. But It's not unusual to drop them in and then discover that some have settled to the bottom on their own....a combination of air evacuating (possibly) and the lower edge of the core finally giving in to the core's weight. At least that's my thunks on it before my second cuppa this morning. I do think there's something to evacuating the air prior to seating the cores, so I don't mind the push-down step. I've heard about the 'Jumping Bean' syndrome but haven't seen it or talked to anyone that has. Urban Legend or fact....hard to say. I'd never say never.

The cores I make run right at .254 and they hit bottom. A lot of pain for no real gain, though. Domed cores would be the bomb, from a material flow standpoint. They might make the punch selection a bit less critical.

Your thoughts?

 

[D Coots]

Just another necessary evil in the process Al.....

Later
Dave

 

[jackieschmidt]

Morning, Dave. The Hood .30 cores I've got here run right at .2598 on average. Due to the jackets taper, they don't plunk right down to the bottom of a J4 .925 or 1.00 jacket. But It's not unusual to drop them in and then discover that some have settled to the bottom on their own....a combination of air evacuating (possibly) and the lower edge of the core finally giving in to the core's weight. At least that's my thunks on it before my second cuppa this morning. I do think there's something to evacuating the air prior to seating the cores, so I don't mind the push-down step. I've heard about the 'Jumping Bean' syndrome but haven't seen it or talked to anyone that has. Urban Legend or fact....hard to say. I'd never say never.

The cores I make run right at .254 and they hit bottom. A lot of pain for no real gain, though. Domed cores would be the bomb, from a material flow standpoint. They might make the punch selection a bit less critical.

Your thoughts?

Al, mine are exactly the same.
I have made my own cores with my die, they fall right in.
Charlie’s cores are just enough larger in diameter that many have to be pushed to the bottom. Some don’t.
They all seat up the same in the die.

 

[AlNyhus]

Cold, windy and rainy today...perfect time to rinse and repeat.

 

[AlNyhus]

The benefit of a press with a lot of feed back...you know instantly when something feels janky.

 

[Fuj]

Ouch......Any clue ??

 

[AlNyhus]

Ouch......Any clue ??

They'll drop right into the group, won't they?

The boundary layer is a real thing but I'm not sure I'd trust it that far!

 

[Tricky5225]

Al, Just tig em up and grind em smooth

 

[Fuj]

They'll drop right into the group, won't they?

Part of them may. I can visualize them starting to peel apart on
leaving the muzzle, then going in sideways in some other zip code. LOL

 

[Mulligan]

I was at the range shooting some test loads a couple of years ago. Another range member pulled in and set up as I was finishing up. Before I left, I went down to say hello and visit with Dave a bit.
He said he had length sorted a wheelbarrow full of 180 Berger's and wanted to test a few.
He had a couple (2 I think???)bullets that were ~.030" shorter than the average length of the lot. And another weird bullet like the one Al posted a pic of that was of the shorter length.

He shot a group of the average length and then shot the couple of shorties...... then the weird one.

The shorties landed about 8-10 inches below the average group at 600 yards ...... less than 1/4" apart..... they wanted to group. He then shot the weird one that was short and had a fold like the one Al posted a pic of....... went right with the other two shorties. I was surprised.

CW

 

[AlNyhus]

It's amazing how funky the tips can be and the bullets will still shoot well. Guy Chism told me to deform the tips and test them. So I cut some tips at angles with a dykes...they shot well. I told Guy what I 'found' and he said something I've never forgotten. "The back steers the front".

 

[jackieschmidt]

The benefit of a press with a lot of feed back...you know instantly when something feels janky.

Al, it looks like the force of the knock out pin exceeded the strength of the jacket.
I think you need to send those bullets to a metallurgical lab and get a complete work up on the material, including a tensile and yield average, along with sample of your bullet lube to a lab and get some real numbers on frictional coefficients when compressed in a enclosed die.
Next, get some bullets from the past made from jackets that never did this, have a complete chemical done on what could have been differ………

Oh, to heck with it. Sometimes this sort of stuff just happens

 

[21PHX]

It's amazing how funky the tips can be and the bullets will still shoot well. Guy Chism told me to deform the tips and test them. So I cut some tips at angles with a dykes...they shot well. I told Guy what I 'found' and he said something I've never forgotten. "The back steers the front".

Wilbur Harris proved it to me 20+- years ago at Rachel’s Glen in Alabama.