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Is the WW Powermax some super performance ammo that may have a long pressure curve?
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I thought it might be as well, but from looking at Winchesters web site it is just a standard .308 with a velocity of 2500 fps at 100 yards. Winchester states this is ammo designed for the White Tail hunter, using a bonded core bullet. Nothing like the Hornady Superformance or Light Magnum ammunition that were pushing the pressure limits.
Did you shoot all the ammunition? When you have something like this happen contact the manufacturer and file a complaint. Usually they will ask for the unfired ammunition to be returned and they will credit you the purchase price or send you a new box to shoot.