Montana Muzzleloader, I have taken personally probably somewhere in the neighbourhood of 20 +/- elk in my life, and been involved in equally as many with friends. I do not believe folks who have never taken elk, or perhaps only a couple (where things went perfect) have the right to claim any experience with the toughness of an elk. Like yourself, I have seen what it’s like when things go wrong in an elk kill. Folks, they ain’t dead till they are dead!! I would refuse to use anything marginal for an elk.
Within this thread I hear about how the elk in the eastern US were decimated by light loads in PRB, and I absolutely believe that statement. What I don’t hear is of the vast numbers who survived the initial shot only to go off miles upon miles into the worst crap hole, died a slow death, and were “wasted”. I also know that deer ain’t elk. Comparing the two makes no sense, and at 40yds the OP’s load is more than enough. Lord knows I wouldn’t stand in front of it!
Walk