Blown .45 Auto casing, or what happens when...

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Quest for the bulge point???

Intentionally searching for the bulge point is asking for trouble-how much trouble is uncertain until it happens at which point it's too late.

Mike, you had somebody looking over you! I'm glad He did it well and you're O.K.. Are you back on the horse yet?

We appreciate your sharing all this with us -hopefully it'll make us all realize we're not "ten feet tall and bullet-proof."
 
CAUTION: The following post includes loading data beyond currently published maximums for this cartridge. USE AT YOUR OWN RISK. Neither the writer, The High Road, nor the staff of THR assume any liability for any damage or injury resulting from use of this information.

Intentionally searching for the bulge point is asking for trouble-how much trouble is uncertain until it happens at which point it's too late.

Searching for the bulge point in the 45acp is different from my other feed ramp challanged cartridges; 25acp, 32acp, 7.62x25mm, 380, 9x19, 9x23, 357 Sig, 40sw, and 10mm.
The 45acp can make allot of recoil before it gets a bulge.

The exception is a really terrible feed ramp, the Para Ord P10 [.235" of intrusion into chamber and the case web is .180" thick]. It bulges at ~ 45acp +P level with standard brass. The only way to get any power before the bulge is Starline +P brass has thicker walls. It barely gets to 45 Super loads with the Starline thick walled brass.

But with case support, my 380 is more powerful than any factory 357 mag, and my 40sw is more powerful than any factory 44mag. I am having some trouble with the 45acp recoil at full potential.
 
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Clark, I think I've known you long enough to say this...

Dude, you're insane... :D

Note to self: Take Clark's "hot but okay" load, reduce by 10%, and then use a string to pull the trigger... And I'm someone who tests 6PPC loads by "did the primer pop?"
 
I had a KB some months back. The case looked very similar to Mikes, but not quite as deformed.

The powder was AA#2 and PMC brass. Never quite figured out what went wrong. My guess was a double charge. I pulled all of the remaining rounds and they were all right.

The resultant blast blew the magazine out of the gun. The magazine follower, spring, and remaining rounds were destroyed. Mag tube is ok, however (Wilson 47D).

Gun is ok.

Face was cut all to hell (had shooting glasses on , though). Oh, it turned my hands black.

I believe that wood grips would have splintered and injured my hand. The rubber grips just gave a little and let the gases pass.

Be careful!
 
Whofan,

"rubber grips gave a little..."

Exactly! That's what happened with me. I've seen a couple of blown cases in the past where the grip panels have shattered and lacerated the shooter's hands.

I didn't choose my Hogue grips for that reason, though.
 
Note to self: Take Clark's "hot but okay" load, reduce by 10%, and then use a string to pull the trigger...

Actually, if you follow Clark's data to the letter (I weighed each charge and used a trickler to get it as exact as possible), in the guns he's publishing the data for, it's not too risky (but not work for a beginner). At the same range trip where Mike had his KB, I was testing some "Clark" loads in my P32.

They performed exactly as he has published. The last load I tested resulted in poor accuracy (might've been the shooter at that point though) and mildly bulged cases. I've decided to pick the next load down from that level (.2gr smaller charge) as it delivered outstanding accuracy. Now, I need to chrono that load and do some penetration testing.

Chris
 
CAUTION: The following post includes loading data beyond currently published maximums for this cartridge. USE AT YOUR OWN RISK. Neither the writer, The High Road, nor the staff of THR assume any liability for any damage or injury resulting from use of this information.

Chris,
Thanks for the kind words.
People have been saying I am crazy for 50 years, not just the last 5 years of me mapping the threshold of case bulges in guns.

I get flamed off every surplus site at the sight of my name, because in part, of my denunciation of CZ52s.

For the opposite reason, I seem to get along with Kel-Tec owners.

I made money designing switching power supplies and consulting to companies with switching power supplies with reliability or stability problems.
I cut to the chase, and overloaded the power supply until something blew up.
Transformers, capacitors, and transistors can explode like a fire cracker.
That would quickly reveal the weak point in the design.
I would improve that part, but increasing the size or better heat sinking, or less losses, etc.
Then I would try to blow the supply up again.
That way I quickly increased the reliability of the design.
For stability, I went from no load to full load in a square wave and compensated until critically damped.
I did not waste time with small signals in a non linear system.

I could afford to blow up power supplies and I can afford to blow up guns [the crummy ones I buy].

So when I started handloading 5 years ago, with in a week I was overloading to see what happens with a trigger string.
I would put .1 gr. more powder in a 9mm than listed in "Speer 12" and pull a trigger string.
Not knowing anything, I thought there was some danger.
I worked up until the 9mm case blew a hole with 115 gr. and 10.7 gr. AA#5, well above the max load of 6.8 gr. listed in my Manual. There was warning, a case bulge appeared at 10 gr.
That was a bulge at 47% and a hole in the case at 57% extra powder and seemed like a dramatic discovery at the time.
When I tried the same thing with my Glock 22 40 S&W, the case bulge appeared at 20 ~30% overload.
When I TIG welded up the feed ramp of the G22 barrel and re cut the chamber and feed ramp, the bulge threshold moved up to ~100% overload.
I was simply doing the sort of thing with handloading that I done with switching power supplies: find the weakness at elevated power levels and correct it. Then go higher.

I feel fortunate that this High Road forum has not banned me or deleted my posts when I describe my experiments with some warning.
While I have never felt any physical pain from 5 years of overloading, it is like the Crocodile Hunter with a rattle snake next to his nose saying, "I have never had a snake inject poison in me."
Common sense would indicate there are some people who really know what they are doing and imitating them would lead to mass accidents.
Clark

--
A society that teaches evolution as fact will breed a generation of atheists that will destroy the society. It is Darwinian.
 
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