Thank you for all the information in the replies.
I have reassembled the magazines and will try it out again. I might be that I was firing reloads from the local gun show I bought a 1000 of.
I did not have any issues previously with the loads so I thought it would be a non issue.
I will also check the slide release spring, though I have not missed it yet being in the right spot.
In response MustangGreg66 the slide release was holding the slide open, there was no feeding jam.