he everyone, i'm new to the forum and also a new owner of a brand new ruger 10/22 (stainless/synthetic). i've only put about 1500 rounds of varying makes through it. (still trying to find a round it really likes) the other day i showed up at the range and fired about 200 rounds of winchester xpert hp bulk from crappy tire (how i regret that) after those 200 rounds the accuracy, all of a sudden, went down the crapper. it felt like i was shooting a shotgun. the rounds were going absolutely all over tha place and noone at the range could explain what was going on. it really felt like something was radically wrong. i stopped shooting and went home to strip the rifle down and inspect the bore. upon inspection, i saw a HUGE obstruction about 2 inches from that breech. i tried to clear it with aa rod and a ton of solvent; i got an amazing about of lead pieces out of there but the obstruction is still there and is not going anywhere. it seems like something was stripping some of the lead off the bullets on thier way out. that would explain the erratic flight path i would think. and the ridiculous amounts of solid lead pieces somehow stuck to the inside of the bore. i'm just wondering about what to do and if anyone has any input or similar experiences it'd be much appreciated. thx a lot guyS!