Primers backing out of .44-40 shells

[Montana Slim]

High-speed-photography would give a pretty good idea of what is happening.

Regards,
Slim

P.S. I still suspect the "load" is not the problem.

[Judge Lead]

Well, it's been about 3 weeks now. Has there been any news.

Regards

[J.D. Yellowhammer]

USFA was supposed to send me a fedex label to ship the guns in a couple of weeks ago. They forgot, and they've been on vacation the last 2 weeks, so there hasn't been any progress. 

If you look in this forum under the chamber pressure thread, there's a good chart someone posted showing the pressure spike in a smokeless round and a bp round of equivalent velocity, etc.  The sharp, fast, and higher pressure peak of the smokeless would explain why my primers stayed in when shooting the heathen stuff, but popped out with the lower pressure bp.

I'll post an update as soon as I get the headspaced guns back.

[Mako]

J.D.,
Did you take sufficient measurements that you will be able to report back what they actually have done to your two pistols?

Also, if you get the chance, write them and ask them to send you an explanation of what they did or attempted to do.  Several of us would like to understand what was happening and how they either fixed it, or atempted to fix it.
Regards,
Mako

[J.D. Yellowhammer]

I measured the headspace on both pistols and most of the shell casings (which matched the guns' headspace, naturally, as the primers couldn't be further out than the headspace).  I also compared the measurements to the headspace on my USFA Premium, which had the correct, in-spec spacing, about .006 as I recall, which is 1/2 of what I found on the rodeos. 

I have a lot of confidence in USFA--I've owned many of their their revolvers.  And I'm really eager to get the rodeos fixed and back onto the range--I have a few different recipes of bp .44-40 loads just waitin'....

[Fox Creek Kid]

I measured the headspace on both pistols and most of the shell casings (which matched the guns' headspace, naturally, as the primers couldn't be further out than the headspace).  I also compared the measurements to the headspace on my USFA Premium, which had the correct, in-spec spacing, about .006 as I recall, which is 1/2 of what I found on the rodeos...

No offense, but did you mean 0.060"?

[J.D. Yellowhammer]

No offense, but did you mean 0.060"?

Oops!  You're right--I let a zero get away from me!  

EDIT: I shouldn't be postin' before I've had my coffee.  I was right the 1st time--the headspace was .005 or .006, depending on the shell (rim width effecting headspace)

[J.D. Yellowhammer]

FCK, I see you had a similar problem this summer:

http://www.cascity.com/forumhall/index.php/topic,26549.0.html

Did you get it worked out?

[Fox Creek Kid]

Yes, I explained it in this very same thread. 

[J.D. Yellowhammer]

I saw that you thought it was soft primers, but I didn't see that you found out fer sure (for instance, by trying different primers).