I was talking with another loader at work and a set of his dies were MIA after his last move and he asked me to help him out. He brought me the brass, projectiles and load recipe. I went to deprime and size and noticed he had already tumbled them with the primers in. I always tumble them after depriming so as to not get any media in the primer hole and damage my depriming pin or rod. What does everyone else do?

I agree!, same here.

I don't think it matters. I do it after I deprime. I clean out the primer pockets anyway so if there is media in there I remove it.

Same here.

Looking for a dependable plinking bullet for my AR.
I have an M&P with 1:8 twist.
Not looking for any type of match bullet but something dependable that doesn't cost a fortune.
So far the A-Max looks to be the ticket.
Just looking for some opinions.

I tumble after re-sizing...it's simple the steps I grew up with and am use to...it's simply a preference, nothing wrong either way.

Was just nosey. I see several do it both ways with mixed opinions. I guess as one said that it just depends on how you began and am used to.

Hell I do it before and after.
Before to clean them up before putting them into my dies and after to shine them to look new.

My two tumblers rarely sit idle.
They're both running right now.

I've only had this problem with corn cob which I stopped using yrs ago.
Never had that problem with walnut.
I use Graff's walnut mix and it's a little dusty at first but a few dryer sheets knock that out pretty quick.

I tumble after the primers have been removed and the primer pockets have been cleaned.