problem with lapua 243 ammo

ddhotbot

http://www.gunbroker.com/Auction/ViewItem.aspx?Item=165511267
i won this ammo, i bought 48 boxes of it.after taking some of it out of the boxes i noticed alot of green corrosion around the necks.we have fired maybe 50rds ,we noticed it seemed hot. i started checking the spent casings and noticed about 10 of them had ruptured at the base maybe 1/4" up from the rim area. they were all exactly at the same place on the brass.the primers are flat and cratered around the firing pin.can this ammo be going bad? did it get wet? would getting wet cause these problems? i also had 1 round that didnt go off so i tore it down, the base of the bullet was green and the inside of the neck was green.i wieghed the powder charge at 45.5 gr of stick powder that didnt look or smell bad. any help is apprec thanks

tsr1965

The best help, and advice that anyone can give you, is not to use it. If it is rupturing in your rifle, even 1 in 20 times, don't use it. Discard it, or scavange it for components like the brass and lead.

Best

perry shooter

+ 1 on salvage what you can but Dont shoot another round Yes you spent $165.00 but don't ruin your rifle and maybe injure yourself . . I suspect the seller knew the ammo was not first quality. why else would he put a buy it now price of slightly over $3.00 a box that would raise a red cloud to me[:(]

Mobuck

This ammo may have gotten wet causing the corrosion. The bullet being corroded to the case mouth could cause significantly high pressure. I would not shoot any more of it. Maybe salvage the components. I would contact the seller to see if he knows what might be the cause of the corrosion. If he sold it as safe to shoot, you might have good reason to get something back from it.

Mobuck

The green isn't sealer by chance?

ddhotbot

no its not a sealer, it is definately corrosion. will corrosion in the case mouth ,on the bullet and the inside of the neck cause these extreme pressures when firing?

zimmden

Yes. The corrosion holds the bullet tighter than normal. It also takes up space in the throat and rifling causing more resistance to bullet movement thus increasing chamber pressure. DON'T shoot them.

ddhotbot

here are some photos

ddhotbot

Tailgunner1954

Contact Lapua

Your second photo is a "burn through" and often indicates a inclusion (forign material) defect in the raw material.

tsr1965

you need to use the "macro" setting on your camera, or manually focus it if possible.

The corrosion actually somewhat fuses the copper jacket of the bullet to the brass(over 90% copper) case neck. In effect almost like a weld, only on the ionic molecular level.

Best