Hello Everyone. I'm new here (first post). I'm just testing the waters of this LRH stuff. I have a USED Rem 700 SS 7mm RUM 26" with a brand new Vortex Viper 6.5-20x50. I'm wondering how I can tell if my used barrel is "shot" / "burnt out". I have used several of my father-in-law's rifles with new barrels of various calibers on the same exact platform and have been able to shoot 3" groups at 200 yds prone using a pack as a front rest, no rear rest (I know, not long range, not even close). Obviously my front and rear rest situation is going to be adjusted to start shooting further. My new rifle has a very nicely adjusted trigger, optics are great, and it feels very steady. I have always felt very confident in "calling my shots" with regards to trigger pull and breathing. I haven't had a chance to load up multiple loads yet to determine what load my rifle likes best, but the best group I could get at 200 yards was 6"!!!! This is TOTALLY unacceptable and not what I have always been capable of. With that said, I was shooting Remington Factory 140 gr. Core-Lokt PSP. Let's just assume that this particular load is the recipe that my gun despises the most . . . would a 6" group at 200 yards be within reason for the LEAST optimal load? . . . or is my barrel not performing as well as it should? It seems to me that even with a terrible load (even though it's "Factory") should shoot better than that. I do handload, but I don't want to waste undue time and money chasing a white elephant and loading for a barrel that can't be pleased. I just got a BRAND NEW 300 RUM barrel that I can swap out (I'm going to at some point this year). Thanks all.