Hey, 150 yards with iron sights on a small target is a trophy. Hell, any deer is a trophy - they see better, smell better, hear better and are on their home turf. We can't see well, hear well, stink to the high heavens and are in an alien environment - sorta. Congratulations!
My first deer was last year and I took it with a stick! It weighed 60lbs gutted. What was it? A trophy!
And it was awesome eating.
ETA: And you took it with an AR platform! That much closer to "main streaming" our beloved rifles.