Hi Greg,your question is timely as I recently ran out of 700x which I load for my light 7/8 and 1 oz. loads but had some 800x that was on the back of the shelf for a couple decades.I started with 23 grains,1 oz.shot,Fiocchi primer,Federal SO wad in a Federal top gun case.This didn't cut it.Very dirty,slow,and not great ignition. Not a squib, but obviously too low pressure to burn properly.Spent some time checking various reloading info and
came back with the same formula except a Fed 209A primer in a Win. AA case.Shot a couple rounds of sporting clays with it and it was much better.Still a bit dirty but much better performance.Interpolating various reloading info suggests a pressure of 6500-7500.Works for me. Will use up my 800x and finally found some 700x, so life will go on.
