I would not worry about paper hulls; from my experience its an absolute rarity to see anyone using paper hulls shooting in this country unless they are an enthusiastic BP shooter, best practice is to always pick up your empty cartridges at the end of the drive so the biodegradable advantage of paper hulls makes no difference.. fiber wads however are pretty important most shoots insist on that.
Another thing to bear in mind is our.. interesting.. laws on shooting wildfowl, if the shoots have a duck drive or flight as part of the day you will likely need to look getting some kind of bismuth or tungsten matrix cartridge as its illegal to shoot wildfowl with lead in the UK.
Would be really interested to see a write up of your shooting here.
Just following on from johns post about high birds, hull imperial game will cope with very good sporting birds, if you know the birds you will be shooting are going to be particularly tall and you are determined to shoot your vintage gun consider going up a couple of shot sizes. I believe imperial game are loaded as big as shot size 4 which might just give you more retained energy at range.
