or you could buy mercenaries.
Go to NCR, buy all of the traders ammo and guns, sit at the entrance, then science them all.In your face, Wastelanders.
If I had a billions of caps I would buy all crapy guns and dismantled then coz I hate scroling down over thousand of guns with det >50% to find some good one.. and the time run up..
people in ncr are too poor to buy anything anwyay, so they would see no difference...
Buy 210'000/20=10'500 items, then give them to 1st level character and let him dismantle them all and he'll reach 21st level by it.