Hello all, I have a problem with my model 12 FVSS in .308 26" barrel

My once fired cases will not chamber the gun with out getting stuck.

I been shooting my own loads with it since new. I've been using new Lapua brass that I've neck sized and trimmed to 2.005 and then loaded with 150 gr Speer's and Sierra's with 42 grains Varget .018 - 020 off the lands. All with no problem what so ever, and what seems to be at the lower end of the velocity range as well.

So now I load the same load in the same case but now they are once fired and bam, stuck case! I've never had a problem re shooting the same case in the same gun before? All I did to the case was neck size, trim, clean. The case appears to getting stuck and the very bottom of the case where the opening of the chamber starts.

When shooting the cases new they eject loose as can be with no pressure signs?''

I'd hate to think I would have to full length size these cases?

Anyone else ever see this?