As expected, through 23 games the NBA leader in 3pt FG% is......Jonas Valanciunas

JV is leading the league in 3pt% with a whopping 51.7%. Rounding out the top 10 we have:

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1. Jonas Valanciunas - 51.7%
2. Patty Mills - 50%
3. Joe Harris - 46.6%
4. Alec Burks - 45.1%
5. Bobby Portis - 44.4%
6. Norm Powell - 44.4%
7. Lonzo Ball - 44.4%
8. KAT - 44%
9. Doug McDermott - 43.9%
10. Nic Batum - 43.8%

source