ALL my loads are set "into" the lands by about .010. Build your load that way from the start and you will have no issues.
A load with a .010 jump to the lands may show pressure signs.
That same load at .010 jam into the lands will not show pressure signs and you can go even higher with no ill effect.

As far as primer issues. first thought is brass problems. Brass too short for the chamber, (headspace) round goes off, primer starts to back out of the pocket, pressure pushes the case back against the bolt head and the primer gets punched or cratered.
Once that round has been fired,(the headspace on that piece of brass will be correct) and it has been formed to that chamber. When you resize/reload, make sure you don't push the shoulder back too far or you'll end up with the same issue.
Another way to deal with that issue would be to make the OAL longer so the bullet holds the case back against the bolt head. Again, when fired, that brass will be formed to that chamber.
Single feed and fire the long OAL rounds till your brass fits that chamber.