I bought a new browning a bolt in 300 rum here this spring. I also got a new vortex viper scope to ho with it. When I got it I did the shoot clean shoot clean for the first 10 then clean every other for the second 10. And used barnes factory loads. Well I had extremely bad extractor marks on the casings So I sent the casing back to Barnes and talked to browning. They said to send it to them to check over. Well it took them over 3 weeks to even get it in the system. After that a couple of days and it said ready for shipment. Well they won't tell you what or if they did anything to it. I think they checked the head space and sent it back. Anyway, while trying to sight it in over the summer I didn't have very good luck. Looking on the internet I saw that 300 rums get hot fast and accuracy drops quick. So I wait till it cools off. A few weeks ago I decided to clean it as good as I know how to. Well I noticed the barrel is really pretty rough. It has scratches that run straight with the barrel and not twist with the rifling. I tried to zero in at 300 yards last weekend. Temp around 50. Shot 3 rounds, 4" group 6"-8" low. So I came up 8 clicks. Shot 3 had 1 flyer so I shot 1 more. Had a 3" group 1.5" low. Between groups I walked the 300 yards to check and so the barrel could cool. Walked twice after the second group (forgot to take a pen). So went up 2 more clicks. Should have out me dead on. Shot 3 more and they are nowhere to be found on my 12"x12" target. I cleaned it real good and going to try again tonight. Do you think its getting to much build up after 6-8 shots that its shooting flyers. If so would you try tubbs or would you take it back and trade for a Remington 700. I've shot less than 100 rounds through it. Sorry for the long post. Thanks for any help. Oh yeah, I was shooting hand loads last weekend. 89 grain retumbo, Barnes brass, cci mag primer 180 grain Barnes ttsx bullet seated to 3.600 oal. And I weigh every loads powder so they should all shoot fairly close to the same.