Thanks Greg, I did pull the bullets and didn't notice anything unusual about the powder, and the dud primers were the same colour underneath (yellow I think) as new ones, not grey/sooty as used primers are, so I think they haven't gone off at all. I may try seating them shallower, but I have heard that seating them too shallow means they get pushed forward by the firing pin without enough resistance to set them off. I may try some other brands of primers. Cheers
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