I recently purchased a MSR 10 in 6 cm, love the gun and it will shoot.

My concern is it seems like its awful hard on brass, I am getting 2 "scrapes" about 1/8" apart from the begining of the neck to the end, this was on virgin brass, 6.5cm necked down and 1st firing, all the cases seem to have this issue. I had some previously fired 6cm brass that was fired in my 110 DT, I believe this was their 4th reload thru, I anneal each time, FL resize, trim, etc., and once I fired them in the MSR 10 minute splits in the case neck.

Any ideas?

Thanks