Went to reload some 10mm I shot up and the range today and wasn’t paying a lot of attention I guess. It was some red box federal I picked up for range fun. Got the brass home and working through prep and can’t get the new primers in to seat. Turned the brass over and and hmm these look different. Pull down some other brass I have and yep. Small pistol primer. Luckily and had a 100 pack of spp I picked up for something. Don’t load my other pistol stuff really. Guess I’ll have to sort all my 10mm brass from now on. Stupid Federal.