I'm wanting to build a sniper rifle. So have a few questions. I'm not sure what caliber to do but I'm thinking 7.62 would be good. I'd like to have something with knock down power but not so long It can't be used for close quarters combat (clearing rooms etc) I want to be able to work my way up to being proficient at sniping at 1000+ yards. I for sure want a hinged sniper stock for ease of transportation. And a bipod. Which bipod is best for sniping from the prone and or sitting position? Next I'd like a trigger that is easy to operate with tactical gloves. Lastly the scope... What scope is best for tactical situations? It needs to have exposed sniper knobs for sure and the tactical flip up caps. Lastly who makes the best sniping ammo? Thanks in advance for any recommendations and btw I have $7500 cash to build this so I need to stay in that budget