I have 2 queries: 1) A lot of reloaders use a device (either hand held or table mounted) to seat primers.With some hand held tools people say they seat primers to a depth that they recognise by "feel". In the other types the seating depth of the primers may be adjusted to a specific depth.These devices mostly retain the rim of the cartridge either in a shell holder or jaw system so the primer may be seated with pressure being applied by the seating plunger to the primer, the rim acting as resistance. Thus the rim is a sort of a base line. In some makes of brass I have measured the rim thickness and it seems to vary quite a lot in thickness in a case lot of brass. Since the "base line" varies in thickness, this would indicate that the primer seating depth also varies. How do you guys remedy this? Turn the ctg rims in a lathe to similar thickness? My co-ax press has a primer seater which eliminates the seating depth problem, but it is much slower without a primer feed, so I prefer something with a primer feed. Is seating a primer by "feel" good enough? 2)The primer pockets in brass grows larger with time and shots, requiring less pressure to seat the primers. Does this play a role in loading really accurate rounds? I've read on this forum of reloaders who keep on using their brass till the primers "fall out" Is consistent primer seating pressure a prerequisite for an accurate round, assuming that the rifle is capable of delivering?