Oh I remember last Christmas so well, I got my first ACCURA.....Oh the Joy!......it seems like you got most everything you need for now execpt a cleaning kit if you dont already have one with a brass brush or nylon brush. Also one of the most important things in my opinion is a good oil. I use Montana Extreme Bore Conditioner in the barrel after cleaning and Birchwood Casey Barricade Oil for the rest of the moving parts. Other than that you should be good to go for now. I have no experience with T7 Powder, I use regular Pyrodox RS in My ACCURA, 105 & 110grs with a 240gr XTP Mag Sabot and T7 and Win W209 Primers, I get 1" at 100 and 2" at 200yd groups with these loads. Any questions with your ACCURA feel free to ask.
Good Luch and Happy Shooting!
Ron (BP)