You are right with everything but the factory ammo. I reload . I use Winchester brass,Nosler 140 gr. ballistic tips, Rl19(61gr),Fed 215mag primers. The gun is a factory Tikka t3. (for now,Brux barrel is in it's future) ,Best group I have shot at 100 is 3/4 inch, gun has shot a .437 at that distance,200 group so far is 1.00, 300 1.487,400 6.0. Yeah , I know not to expect miracles . Best ballistic co-efficient of any 270 bullet that i saw was .498 (Berger VLD), so groups are going to be hard to handle.Not to mention that the nut behind the wheel aint rock solid (little shaky), all I want is to squeeze as much out of this as my body and this rig will let me. This is my first attempt at shooting anything over 100, but when I start something like this I kinda get a little hard headed ,will not quit till I have exhausted all possibilities. So , I know that 6" at 400 may be the best I can get out of the rig and myself, But, I wont know that for at least 3-400 rounds. Thank you very much for you comments. Any thing you think I can do to improve ,let me know. Always could use constructive criticism to keep my self grounded. By the fyI, I am going to use this for whistle pigs and punching paper. All the deer iI have shot Here in Pa have been under 100 and my slug gun(circa 1963 rem.wingmaster w/Hastings barrel ) shoots 1inch groups at 100.