I could have mixed some old brass with the new ones. I am going to neck size only the next batch. I shot about 8 times this morning with no signs of bulging, so the cases might have been old. I think that if the head space was to big that they all would at least bulge. I am also going to drop back to 33 grains of IMR4895. Thanks very much and I will let you all know how the next batch does...