[sum1]

Well I believe the problem was the primers, I remember spilling some that I used in the original batch and i picked them up one by one with my hands which may have been somewhat oily, I have only had them a few days but they could very well have been old aswell.

I made 5 rounds last night with the same process except 2 of the 5 rounds which I primed using my press and all 5 fired no problem. The original shells when fired did not make a audible pop or anything just the sound of my firing pin hitting.

Dimension wise my reloads are no different then my factory loads +-1 or 2 thousands on the rounds i measured.

[robocop10mm]

OAL is one thing, but position of the shoulder dictates the headspace. Contrary to popular belief, it is not easy to kill a primer. You have not said what the primers looked like after you attempted to fire. A very small indentation may be a sign of excessive headspace preventing the firing pin from getting a good strike on the primer.

[cpttango30]

I am going to lay my money on the fact that you didn't have the primers seated deep enough. You say they are federals and federals are known to have the softest cups of all the primers. It takes a lot of gunk to mess up the primer pockets. I have rounds I have loaded 15 or 20 times that have never had the primer pockets cleaned still work great.

I have sprayed wd-40 kroil and other stuff into cases and then dumped it all out and the primer still went off. Even left each one in there for a while.