I don't know what an FA 83 is, but as for the load, I wouldn't do that if I were you, it's gonna be too hot. H110 with a 300gr xtp shouldn't be over about 18gr. Keep your overall length at or under 1.6" if this is a tube magazine, if its a single shot you could be longer.
edit: ok I looked up FA 83(the internet is great). you have a handgun. that load still sounds a little hot. my manual suggests a max load of 20.1gr of H110. If it were me I would start at 18gr and work it up looking for signs of excess pressure.