In the last day of reloading many of my 9mm cases have not been going in straight and the rim is being crushed: station #2 in the Dillon 550b. Glock 34. No issues with casings the last two or three tumbles. Low powder charges of WSF at 4.9 and oal of 1.150 with MG FMJ 124. Once in a while the top of the case will be crushed by the powder filler. I'll see it and push the case over a hair and then the powder filler goes in straight. Everything is tight on the Dillon. Once the powder-filled case goes to the bullet seating station everything is good to go. Mixed brass. Used about 5 or 6 times. Are the cases getting weak and unable to withstand the normal "push" to the side of the powder filler? Not all my cases are doing this. Maybe 25%. Just the last day.