so I got about 70-80 rounds of these 2-H8025 - Ammo .223 Remington Hornady Superformance V-Max 53 Grain 3465 fps 20 Round Box for free from a buddy of mine, but every time I go to cycle them through the weapon the bolt locks forward tight and will not come back with out a strenuous pull on the charging handle. I polished the feed ramp inside the receiver and that made it so instead of jamming every shot it works fine until the oil that I literally soaked the ramps with wears down then starts to jam again. 1:10 jams up now, it's really starting to get irritating. I tried steel cased, fmj's, hollow points, pretty much every thing else cycles fine. I haven't shot any yet, I have just been manually cycling them in 3 different mags I've been little worried to shoot with a bolt sticking forward. Any ideas?