I have a 20 inch WOA with a 1 in 10 twist, which I shoot suppressed. For coyotes, I use 35 and 40 grain Bergers. 35's are great no exit, 40's will sometimes exit but are not hard on fur when they do. Years ago, I used to shoot 39 grain SBK out of a 204 but had some horrific splash wounds. I am a little ways north of you and hunt willow slough, and a bunch of the surrounding private farm land. I usually use 40 grain Bergers because they have better BC and my shots are usually between 100 to 300 yards. For powders I have had good luck with AR comp, h322 or N133. My hunting partner is waiting on a barrel from compass lake. He ordered a 22 inch 1 in 10, I believe it is a Douglas.