are you using re sized 308 win brass by any chance this could lead to this issue also as when you resize the brass the neck of the case becomes thicker than a normal 7mm-08 case and it doesn't have room to expand in the chamber properly and create that issue this can be fixed by neck turning the brass a process where a small amount of brass is removed from the outside of the neck to decrease its thickness
could also happen with 7mm-08 brass if your using brass with a slightly thicker neck and your rifle has a tight chamber
I had this issue when I 1st got my 6mmrem in the young falla rush to shoot it the shop didn't have brass so I brought 7x57 mauser brass gut it home run it through my full length sizing die sweet 6mmrem brass smart dude I was thinking was so confident that I didn't even test fit one just loaded up the full 100 with a nice mild load got to the range the next day and went to chamber the 1st round in my new very expensive custom gun and the bolt wouldn't close the necks were to tight in the chamber so I went home with my tail between my legs and had to pull all 100 rounds and get a mate to neck turn the brass for me lol big lesson learnt
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