So I'm new to this site but ive been reading this thread for quite some time. I have a LR-308 24'' bull with the same issues. Lubed it, steel wooled the barrel, feed ramp, changed ammo, bought new mags. All the stuff you all recomended. Mind with barly 40rnds through it. I took it to the smith and he said my extractor was too long. It kept pushing the damn bullet against the walls of the barrel causing dents and making it look as if there were burrs on my feed ramp. Just something to look at for those of you with the same issue. BTW a lot of you are right one the gun is working properly, it runs fantastic.