Off the wall

[CZ527 Guy]

I would not recommend it, strongly not.  Burnout happens in the first 5 inches of barrel, so one problem I see is that too little gas might be generated to cycle a DI bcg properly.  And not sure whether the  bullet will behave properly with not enough oomph behind it.
Other thing - perhaps the biggest one - we can't predict what happens when ~19 gr powder sits in 35 grs of space.  Only 59% fill rate.  You're setting yourself up for a kaboom/ detonation/something bad.  Anything less than 80% fill and you're asking for trouble.
It is way too fast of a powder for the 6Arc.
You don't have a better powder to use instead?  So many common ones to choose from, H4895, H335, Tac, Varget, 8208 xbr, RE15...
Best to stick with more traditional powders.  Keep the lil gun and H110 in the 300 BLK realm.

Strongly agree with Grayfox on this. Much safer better powders are available for your application which are in published data for good reason. 
Can not see a good reason to give this propellant any further consideration in the 6mm ARC. Some powders are somewhat forgiving in a wide range of applications. Do not expect Lilgun has any, utility in the 6mm ARC with safety in mind.