Any advice on how to practice long distance shooting, as in, getting out to 1000 yards, and passing it with the goal of 1760?

>rifle/glass/gear recommendations

>techniques to study and practice

>dry firing techniques

Right now I'm shooting a T/C 308 With some old 8x Nikon glass my dad left me, I can put 5 rounds in a 5 inch group at 300 yards. Any advice is appreciated.