I will follow this one.i have the same questions.

I don't understand what actually causes this but, I am a victim of it.

Mine happened with a 30/40 HW. The load was 18.5 gr of 296. I had chronoed the load and in the second CBA match, I shot it in, I had a case stick, in the next round, I had to use my cleaning rod to get it out. The bulge was just to the rear of the shoulder.

The wad I used was much more fragile that the floral foam. It was 1/8" thick and 3/8" square, with large air cells. I push it in with a 1/4" dowel.

I did read Dell's reasoning of barrel ringing and his conclusion was that the power has to "slump" to avoid it and can not be held directly against the primer.

After reading that, my thoughts on my mishap, was that, the full power charge, was thrown forward and when it hit the bullet base (fixed), the shock wave pulverized the powder and that combo, caused the pressure rise that bulged the barrel.

You can think what you want, regarding this but, when it actually happened to you, you won't want to try it again.

I put wads in case mouths, to prevent powder spilling, if necessary but, that's it! 

"Once bitten, twice shy"

What about a fluff or nap of Dacron or kapok?
I understand the need for the slumping of the powder with a wad.

But wouldn’t a filler just combust?

I was thinking of a nap of kapok and them some grits, flour, or lube to form a wad and seal the bullet base in an attempt to get a badly pitted bore to shoot.

Thanks!

Just so as I can waste your time and make you scream down the computer at me ,and pull your hair out, may I ask?

What if one put a fluffy tuft of kapok on the base of the case  over the primer then the powder and wads.
Would it work like a compressed load or make matters worse?

I’m sure people have found many ways to blow themselves up.

I’m not real confident in placing a wad deep in the neck of a case where it will rest and not fall through.
I don’t want to use a heap of filler that will compact into a hard wad at the case shoulder either.

Looks like I will be looking for recycle 4 plastic containers to cut up.

Thanks from a 61year old delinquent trying to make 62.

Bruce,
No need to place the wad that deep - higher is better actually, and no wad even better.  Whatever will make sure the top of the powder column isn't parallell to the bullet base.

O.K. Fellas I fully understand now.
I don’t know why I’ve had so much of a mental block with fillers and wads for so long as I have.
I have understood it I don’t know why it hasn’t sunk in.
Ha.

Boats ; the trouble is no one does such things around here anymore except me it appears and yes you are right about us young fellas reading old books and techniques from the past, as it is mostly our only reference or stuff we can find.
I end up with all sorts of crap ideas about stuff that was descovered and then debunked then re invented.


The question really regards the use in a 30-30 I have but the concept and the approach remains the same.

I don’t have to use a wad in my 30-20 + 1 grain case for good results.
When the world allows us to have some large pistol/small rifle powder I will get serious about some informal pb bullet shooting again.

My 310 cadet has been on a diet of adi 2207 for a while (too slow)and is remarkably accurate if I can load a case without becoming hung-up through the unburnt powder.
I blow into the throat like a black powder shooter would.

I’m on my way again happy as.
Thanks.

P.s.
Martini Belgian you were looking for smokeless loads for your 30-20 around abouts.
I have used bulleye a lot for 150-170 grain bullets.
Once the powder kicks in at 2.8 grains approx it has a nice zone of 0.1 increments where it just shoots well in my barrell.
I haven’t chronographed it but it must be around 960 fps.
It took a while to reach the 300 mtre gong but it was consistent.
I just used that load as it was easy on the shoulder ears and above all hip pocket.
You can see the  Scottish blood coming out in me now.
Ohh  those were the days of cheap primers too.

I will let you all be now.
I am tending to use softer and softer lube all the time.
I still believe in filling all the grooves in a bullet while I read you only need a wipe if at all in a certifiable match grade well lapped and seasoned barrell.

Did Charlie's experiments include fillers as well as wads?

I have routinely been using powdered bran as a filler in 38-55 IMR4198 loads that are only 2/3 case or less.  No problems to date, but as with all these chamber ringing problems, it works until it doesn't.   

Not sure there's a huge advantage to the filler, but it does hold the wad against the bullet base when I use a wad, and I think I get a bit more consistent velocity variation for less vertical deviation at long range.

I'm normally a black powder shooter, so avoid most of these type of problems.