Thank you for the compliments, and congrats to you on the 35 and 37 inchers. The biggest I've seen in the field after the shot was a 38"...he seemed magnificent.
He did not drop in his tracks. After the round impacted, he gave a hunch, and then whirled in a circle for one or two revolutions, and then took off on a run for about 150 yds. Stopped, bedded for about 5 mins. Then got up, walked another 15 yds, and then bedded out of sight. Gave him 15 minutes, walked up to him and found 'em.
My best group to date has been a couple of 3 shot groups that came in under 1.75" center to center at 300 yds. After 3 of those groups (9 shots) load development was over for me
...and have since focused shooting at greater distances, and learning the wind for longer shots. I'm certain the rifle would shoot much better with a different shooter and handloader.