147 grain would be awesome in a Jericho. The beauty of the IWI is that it's built to be a 45 cal. So in 9mm format it has a lot of steel to keep the bang inside. Now imagine a 750 grain 50 cal shot. There won't be much shoulder left.
I'm heading out to Guildford tomorrow. Are you going to be there?
I need to pick up some slugs for the 870. Birdshot doesn't have the same kick as a sweet rifled slug.