I am somewhat new to reloading and have a question I hope someone could help me with. i have a remington 700 custom 300 RUM and seem to be having trouble with the brass I am reloading. I am using remington brass and loading 94 gr H-1000 pushing 180gr NAB. I am getting some extractor impressions or sheer marks on the end of more than half the cases and about a third seem to become sticky on the bolt. I have chronographed the load at 3250 and it seems to be a safe load. Never had any major indications of too much pressure(to me anyhow.) Can someone tell me what is going on with the case to make the bolt so sticky to open and close. I use a full length resizing die and everything is done to factory standards. Any advice would be appreciated.