Help with ruptured case...double charge?

[Chief-7700]

The OP's pictures were the result of an overcharge of Bullseye, I have seen happen a few time.

[noylj]

I load on a Dillon Super 1050. It has a ratchet assembly that locks up if you short stroke. I have loaded several hundred rounds, ten at a time to test various bullet/powder/charge weights for accuracy.
Reloading cycle is I load 10 rounds in the case feed tube, set my ChargeMaster for the desired load, and it dispenses the first load while I work the cases around to the powder funnel die.
I verify the charge on the ChargeMaster, pour it in the powder funnel and it goes into the case. I put the pan back on the ChargeMaster and lower the ram, check the powder in the case and place a bullet on the case, raise the ram to seat the bullet and take care of the other stations, keep the ram up until the charge is dispensed. Verify the reading, pour it into the case and cycle again. There is no short stroking and I can not see where I could double charge, but I did (it appears).
Toady a round loaded with a 177gn L-SWC and 6.1gn of AA5 went KaBoom. It bley the bottom out of the magazine and opened up the forward part of the grips. half the case is still in the barrel.
I came home and ordered another RCBS Lock-Out Die. If I can some how over-charge a case doing them by individual weights and inspections, I need something independent of me to inspect the cases. I had one one each of my dedicated 1050s, but have never had a problem like this in 35+ years of reloading.
Any hints to get the forward section of the case out of the barrel?

[Chief-7700]

Pictures are to small to see the headstamp. What Caliber were you loading when the incident happened?

[noylj]

I tried to post a larger picture.
.40S&W, 177gn L-SWC, 6.1gn AA5
Headstamp was Win NT. The case head is now a large oval.

[m1a1driver]

Oh wow, hey man i'm glad you are okay!