I don't know what to do, I know if I nerf the Rangers, NCR fanatics will hound me for being biased against the NCR.
Well the Centurion Armor is too high as well IMO. Though it has lower leg protection, most of it is pieces of junk armor. It looks like 20dt to me.
If you give the rangers 18dt 100% trail carbines, (rangers are not going to let their weapons go) 44 mags, amrs, and a couple with 100% hunting shotties, but leave their skill and perks they should be fine.
To not piss of ncr fans I d just say the 45/70 is just plain fake in damage. Look at bullets on wiki, and it shows the Joules of every bullet, and the 45/70 is just way too powerful in game.
Then nerf the Centurion armor to 20dt. I think they would get brand new never used weapons for major battles, so Id give them 100% assualt carbines and amrs, hunting rifles, and always throw at least 2 in with a thermic lances or what ever those things are.