:It happened to me: (or "Lucky I didn't blow up the gun")
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Old 05-06-2012, 02:03 AM   #1
1911 .45ACP. . then there are others.
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Default :It happened to me: (or "Lucky I didn't blow up the gun")

After getting the loading bench set up after a home move and a short break from reloading, I threw two loads of 5.5 unique in WCC cases and a 230 LRN to try out in the 1911 .45 ACP

My first round had a very snappy recoil, so I shot a factory round and confirmed that the hand loaded round was hot. I searched for the case with no avail. My factory case was sitting where I expected it. A further search still was fruitless. I fired my second handload and again had excessive recoil and torque. Still no case to be found.

I went back to the bench, double checked everything before loading any more. What I found was I errantly set my scale at the first mark, thinking it was 5 gr. A quick double check of this scale revealed that the first mark is 10 grains. What I had was a 10.5 unique, not a 5.5.

No apparent damage, stretch, cracks, bulges or other problems with the barrel frame and adjoining parts.

This was more than a proof test, but I am lucky that everything held to gether with such a hot load.

I credit this to 1) unique, 2) Lead cast Round Nose and 3) a .451 on the bullet.

I have never had this problem before, but want to ensure it won't happen again. (I'll count the intervals and ensure the scale).

A Lucky day for me and the Kimber.

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Last edited by KG7IL; 05-06-2012 at 02:04 AM. Reason: type correction
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Old 05-06-2012, 02:22 AM   #2
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So that was you. No wonder you couldn't find that ejected case. It landed on my porch a few minutes ago.
cottontop

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Old 05-06-2012, 08:40 AM   #3
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Glad you or the gun were not damaged.
A little computer generated data for you to look at.

Code:
 Cartridge          : .45 Auto (ACP) (SAAMI)
Bullet             : .452, 230, H&N RN KB
Cartridge O.A.L. L6: 1.250 inch or 31.75 mm
Barrel Length      : 4.0 inch or 101.6 mm
Powder             : Alliant UNIQUE

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-20.0   51     4.40    629     202    8381   2531     79.3    0.878
-18.0   53     4.51    643     211    8781   2624     80.3    0.859
-16.0   54     4.62    657     220    9194   2717     81.4    0.841
-14.0   55     4.73    671     230    9619   2810     82.4    0.823
-12.0   57     4.84    684     239   10057   2903     83.4    0.807
-10.0   58     4.95    698     249   10509   2997     84.4    0.790
-08.0   59     5.06    712     259   10973   3089     85.3    0.775
-06.0   60     5.17    725     269   11451   3182     86.2    0.760
-04.0   62     5.28    739     279   11943   3275     87.0    0.745
-02.0   63     5.39    753     289   12448   3367     87.9    0.730
+00.0   64     5.50    766     300   12968   3459     88.7    0.715
+02.0   66     5.61    779     310   13501   3549     89.5    0.700
+04.0   67     5.72    793     321   14049   3640     90.2    0.686
+06.0   68     5.83    806     332   14611   3730     90.9    0.672
+08.0   69     5.94    819     343   15187   3819     91.6    0.659
+10.0   71     6.05    832     354   15779   3907     92.3    0.647

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba     64     5.50    811     336   15232   3631     94.9    0.660
Data for burning rate decreased by 10% relative to nominal value:
-Ba     64     5.50    712     259   10790   3175     80.1    0.777

Code:
Cartridge          : .45 Auto (ACP) (SAAMI)
Bullet             : .452, 230, H&N RN KB
Cartridge O.A.L. L6: 1.250 inch or 31.75 mm
Barrel Length      : 4.0 inch or 101.6 mm
Powder             : Alliant UNIQUE

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-20.0   98     8.40   1093     610   32431   5492     99.8    0.455  !DANGEROUS LOAD-DO NOT USE!
-18.0  101     8.61   1114     634   34345   5598     99.9    0.443  !DANGEROUS LOAD-DO NOT USE!
-16.0  103     8.82   1136     659   36341   5697    100.0    0.431  !DANGEROUS LOAD-DO NOT USE!
-14.0  106     9.03   1157     683   38421   5791    100.0    0.420  !DANGEROUS LOAD-DO NOT USE!
-12.0  108     9.24   1177     708   40588   5883    100.0    0.410  !DANGEROUS LOAD-DO NOT USE!
-10.0  110     9.45   1198     732   42846   5975    100.0    0.400  !DANGEROUS LOAD-DO NOT USE!
-08.0  113     9.66   1218     757   45198   6067    100.0    0.390  !DANGEROUS LOAD-DO NOT USE!
-06.0  115     9.87   1238     782   47649   6157    100.0    0.381  !DANGEROUS LOAD-DO NOT USE!
-04.0  118    10.08   1257     807   50203   6247    100.0    0.373  !DANGEROUS LOAD-DO NOT USE!
-02.0  120    10.29   1277     833   52863   6337    100.0    0.364  !DANGEROUS LOAD-DO NOT USE!
+00.0  123    10.50   1296     858   55635   6425    100.0    0.356  !DANGEROUS LOAD-DO NOT USE!
+02.0  125    10.71   1315     883   58524   6513    100.0    0.349  !DANGEROUS LOAD-DO NOT USE!
+04.0  128    10.92   1334     909   61536   6599    100.0    0.341  !DANGEROUS LOAD-DO NOT USE!
+06.0  130    11.13   1353     935   64675   6685    100.0    0.334  !DANGEROUS LOAD-DO NOT USE!
+08.0  133    11.34   1372     961   67949   6770    100.0    0.327  !DANGEROUS LOAD-DO NOT USE!
+10.0  135    11.55   1390     987   71363   6854    100.0    0.321  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba    123    10.50   1324     895   64101   6250    100.0    0.338  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    123    10.50   1255     804   47000   6681    100.0    0.382  !DANGEROUS LOAD-DO NOT USE!
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Old 05-06-2012, 11:08 AM   #4
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Welcome to the club. Was doing some heavy jacketed 9mm Parabellum w/ Bullseye, realized part way thru the 50 rounds that my scale had been bumped, and I had a horrendous overload of Bullseye.

Snarl, curse, rant dirty word dirty word DIRTY word- where is the bullet puller?

Lesson learned.

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Old 05-06-2012, 05:03 PM   #5
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I'm glad nobody or anything was damaged!

Just moved my scale, and this morning noticed that I had set it up wrong and I would have been adding about 2 grains more than I intended. I caught it before I loaded anything, but it drove home that I need to double check everything, every time!

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Old 05-07-2012, 02:01 AM   #6
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Glad to hear you and your gun are unharmed. Thats the reason I like a digital scale

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Old 05-07-2012, 03:12 AM   #7
1911 .45ACP. . then there are others.
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Quote:
Originally Posted by steve4102 View Post
A little computer generated data for you to look at.
Code:
Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms
+00.0  123    10.50   1296     858   55635   6425    100.0    0.356  !DANGEROUS LOAD-DO NOT USE!
yow! That's more pressure than a Kimber critic could take.

Quote:
Originally Posted by ktmboyz View Post
I like a digital scale
Might be in my future.
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Old 05-07-2012, 03:22 AM   #8
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And everybody thinks that it just cannot happen to them!

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Old 05-07-2012, 03:41 AM   #9
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you experienced a 460rowland load. the 1911 is capable of handling that pressure easily but it beats the living snot out of a frame on a gun that doesnt have a strong enough recoil spring.

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Old 05-08-2012, 01:14 AM   #10
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You learned a valuable lesson and fortunately did not have to suffer an injury.

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