Preferred propellants for the 6mm Arc?

[junkmansj]

Here are a Couple I have had luck with in my AR- 6 ARC
26.6 gr of Vihti vouri N 140 With a 90 gr Berger shot .548 100 yds. 2 5/8" at 300
25.9 gr TAC 108 Horn eld shot .460 100 yds
Still testing!