The primer listed in the manual is listed to show that they obtained their results using those specific primers. It not an absolute requirement to use the components they listed. But like they say, if you do use something different than what is listed, start at the starting load and work your way up.
I myself never pay much attention to the case or primer that is listed in the manual. But I always start low and then go up with the powder charge. Have'nt encountered any problems yet.
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