All very good advice, lots of personal opinion.
So please may I offer mine?
All the cartridge manufacturers have to comply with the CIP specification in Europe, that being said ALL the brands be suitable.
IMHO many manufacturers have lost sight of the ball and are chasing velocity, when in reality we the customer want performance and comfort.
With this in mind we should look at the 'light' loads available from the manufacturers.
Hull & Gamebore produce a Light Load commissioned by H&H which is a superbly comfortable to shoot.
Eley 'First' are cheap, perform well but are considered 'dirty' because of the powder/ wad fouling, but if you have a cleaning regime in place that is no problem.
I have to agree with Toby that the Eley Impax are a little sharp especially in the lighter gun, but of course they are an old established traditional game cartridge and much loved by the 'Gentry'.
In the US I would use something from RST but here at home (UK) I would never hesitate to use Express Supreme or Hull Imperial Game.
The Italians know a thing or two about cartridge loading, but they do sting a little possibly as a result of their passion for Trap shooting.
Remember the well worn maxim 'Find a cartridge you like and stick with it'. Good shooting.
