I've noticed this only recently. New brass that has been full lengthed, once, twice fired etc. All brass is being FL'd after firing and shows gas on shoulders part of the time, one's with no gas marks have different POI than one's showing gas on shoulder. I have backed my die off to keep from bumping shoulder and the problem is still there. The rifle: over the counter REM 700 in 7 rem mag. Brass: WIN Die: RCBS Bullet: 150g NOS PAR/ 160g ACC Bond Charge: 69.5g retumbo or 63g h4831 w/ NOS PAR and 67-68.5g retumbo with 160g accubond. Seating depths vary. No chrony to check speed. I know this has been posted before but it seems there is more to this. Any suggestions would be great. Thanks in advance, great board here, been viewing for a year or more and finally decided to ask some of the finest about my problem.