Geco factory ammo an almost blow up.

[Bavarianbrit]

Was there any update on this @Bavarianbrit ? Or is DEVA still catching up with the fax machine?

He called me today and I asked for an update, the extractor is broken he has another Mannlicher Schoenauer so he tried that bolt in it and all ran smooth. He is taking it to a young gunsmith who trained at Suhl for a thorough investigation, my pal said the barrel looks ok.
On that 4th shot there was someone behind the person who he had lent it to to shoot it who is a known very good shooter my pal was getting very bad groups so that is why he lent it out.
The witness saw the smoke come out of the gas escape vent on that 4th shot.
The ammo was old but was factory that had come with the rifle when he bought it.
I wonder if something other than a .243 Win round found its way into the magazine for that final shot.

Any idea what might fit other than .308 Win? The bullet would not enter the bore with that one.

 

[Heym SR20]

He called me today and I asked for an update, the extractor is broken he has another Mannlicher Schoenauer so he tried that bolt in it and all ran smooth. He is taking it to a young gunsmith who trained at Suhl for a thorough investigation, my pal said the barrel looks ok.
On that 4th shot there was someone behind the person who he had lent it to to shoot it who is a known very good shooter my pal was getting very bad groups so that is why he lent it out.
The witness saw the smoke come out of the gas escape vent on that 4th shot.
The ammo was old but was factory that had come with the rifle when he bought it.
I wonder if something other than a .243 Win round found its way into the magazine for that final shot.

Any idea what might fit other than .308 Win? The bullet would not enter the bore with that one.

6.5CM, 7-08 even a 308 if you run the bolt hard and there is not much in the way of a crimp. The 6.5 CM shoulder is shorter than the 243. Jam the bullet in the lands and shove the case into the rest of the chamber by slamming the bolt forward.

Alternatively if it was old ammo that had been incorrectly stored - box bounced around in a land rover for a while, the powder grains could have degraded / been broken down etc. This in effect a very much larger surface area within the powder charge thus making the burn rate very very much higher and explosive in nature. Consider a lump of coal, versus the same lump of coal ground into dust - the former will burn, but coal dust explodes. Same happens with powder - burn rate is a function of chemical make up as well as the kernel size and shape.

 

[billgatese30]

4th shot was seen on target so it cant have been greater than 6mm.

 

[Dalua]

7-08 even a 308 if you run the bolt hard and there is not much in the way of a crimp.

It might take quite a force to push the bullet back into a case already full of powder, and then to resize the neck-diameter down by 1-1.62mm?

 

[Sonicdmb73]

6.5CM, 7-08 even a 308 if you run the bolt hard and there is not much in the way of a crimp. The 6.5 CM shoulder is shorter than the 243. Jam the bullet in the lands and shove the case into the rest of the chamber by slamming the bolt forward.

Alternatively if it was old ammo that had been incorrectly stored - box bounced around in a land rover for a while, the powder grains could have degraded / been broken down etc. This in effect a very much larger surface area within the powder charge thus making the burn rate very very much higher and explosive in nature. Consider a lump of coal, versus the same lump of coal ground into dust - the former will burn, but coal dust explodes. Same happens with powder - burn rate is a function of chemical make up as well as the kernel size and shape.

considering the additional info re age of the ammo this is plausible.