How do you knowyou missed? Because the deer didn't drop? Because you didn't find any blood? In our group of 13 we found 3 dead "missed" bucks. No blood trails for any of them, none of them "appeared" to be hitincluding one that I watched with binoculars as it was being shot at.All found within 200 yards of the last place they were seen. I'm guilty of doing the same thing once. Thought it was a clean miss, no blood, dead buck 400 yards away...

What bullet are you using in 180 Winchester? That may be more important than bullet weight (180 gr. is very popular and effective in a 30.06.

Was the deer moving? What angle was it at?

How many other people helped you look for the deer, how long, how far did you look?

If you are on (By the way, whatsize group and where are you hittingto be "on"? I've noticed being "on" varies greatly between hunters and/or hunting groups.)at 100 you should be on at 80 or within a 1/2 inch. Either you hit the deer, and they are now dead or wounded,or you are unconsiously changing your point of aim as you pull the trigger (looking at the deer's head, jerking the trigger etc.)

People on this forum are great helpers, but we really need more exact info from you in order to help.