I want to try some for close range Coyote elimination in a 16" AR, any ideas? Thanks

The round was really not developed for a light subsonic bullet.
Why not just go up to a 220 or 240 gr Sierra or try a Lehigh subsonic or Outlaw States 240 gr hunting bullet.
I have had very good success with both on deer with my 300 Whisper and I am sure it will do the number on coyote and other vermin.

I have tried many different powders and have currently settled on Lil' Gun for the heavy subsonic bullets that I shoot-with the suppressor sound is negligible.

Gary

This months American Rifleman has an artice on the 300 Whisper/ Blackout. There may be some information there for you.

Yep impala, there's some good info in there. Thinking about getting me a new upper in the .300 Balckout.