I made a good old fashioned cock up on Saturday while doing some load development on my .308
Having carefully loaded 35 rounds progressively working up my charge I noticed that the box of Federal Primers I had used said Pistol and not Large Rifle Primers. The dangers of such similar packaging.
Quick call round to my trusted friends and a Google search suggested this possibly wasn't the worse thing in the world and certainly not worth disassembly. On the range Sunday they worked perfectly. I guess now though I should go through the same procedure with Large Rifle Primers and check once again for signs of pressure but I'm tempted just to work up from slightly under my top load last time and see how I go from there.
Does make you wonder what the real differences are.