1293fps 45acp w/ 6-6.2 grn of SW ultimate pistol

[Jkoch]

Went out shooting today with my Dan Wesson 45 ACP and had to put the heavier spring in the 15 pound spring last fall and I knew they were hot loads but was shocked when I put it on the chronograph I verified that it was working by shooting the 9 mm which put about 1000 ft./s (hand loads) with 115 grain round nose and the 17 Rem rifle was 3800 to 4200 ft./s so I know everything was working.
I verified that the powder was indeed Ultimate pistol and not clean shot by looking at the powders comparing. I didn’t have any open clean shot bottles but I did have an ultimate pistol that was about half a pound used. When looking at the two powders they do look quite a bit different clean shot almost looks like a powdery type substance and almost completely whitish grayish and the ultimate pistol looks darker and not as fine. 6 grains is within the specs so I’m not sure why it’s going so high? I guess everyone gun is different and I’ll have to pull these bullets.
I just wanted someone to see what has happened and luckily nobody got hurt but that’s gotta be pressures up in the 45 super range.
I attached pictures of the casings that were fired. I added 2 nickel casings that are silver and they are federal cases that were fired from someone’s striker fire pistol ( range brass) the primers do not look that much different between my HOT loads and these regular pressure /factory 1-of them says +p loads...
so has anybody else gotten that high of velocities on these close to Max charge?

The first picture I attached what is the reloading info of ultimate pistol powder

 

[GLShooter]

I'm not positive but I've never seen a 230 go that fast in a 1911 and I've been shooting them for 50 years now off and on in USPSA matches and other games. You verified your speeds so they would appear to be real.

I can't imagine what a 180 would run out. I do know the pressures would have to be humongous. There's no free lunch in ballistics.

Greg

 

[SeabeeKen]

Those speeds are in there with my 45 Super.

 

[Jkoch]

yikes that’s what I thought. The ejected brass was so far from me was a quick sign that things weren’t right.
I was just surprised that the cases don’t look overpressured? these pressures are a lot different than rifle rounds I just couldn’t figure out why they got so high I didn’t overload them according to what the specs were so I’m just a little bit shocked.
I double checked crimp and The length overall all were in spec. the crimp didn’t leave any ridge/indent ect on the bullet.

Time to empty all the rounds drop down accordingly and test again and see what the round does.

 

[Park ranger]

I doubt you see over pressure sign in a 45 acp, before actually being over pressure for that gun.

well, if you were 65ksi you’ll see signs.

 

[SeabeeKen]

Straight wall pistol cases don't show signs like rifles do. Can you share your load info? Bullet case, COL, etc? Id weigh those charges when you pull the bullets. Something isn't adding up here. Is the chamber in your pistol fully supported? No bulged cases? One thing I see is a number of different makes of brass including military brass. Military case capacity can be less than commercial and result in higher pressures. Something to consider.

 

[Jkoch]

So I apologize not getting back to everyone that had taken the time to reply. I had computer issues and I didn’t even know where I actually had posted these questions.
I did pull all the rounds. I believe the powder was pretty much verified.= it was ultimate pistol powder and the loads were off of
shooter worlds reload data.
I reloaded with lighter loads and everything was fine.w/in speck.
I believe my chrono is not working now, but I believe I was in the 800fps when I went out. Will pull a bullet to see what the load ended up grains were.

Yes, I agree. It seem too good to be true something had to be off, but it was the right powder right bullets, and the amount was within spec.