Good afternoon from London. I am looking to load some 12g slugs either usng the lyman forster slug or the Lee 7/8 or 1 oz slugs. The problem I have with most of the available load data is that the case and wad combination usually relates to components available only in the US. I have ordered some Cheddite cases and some B&P cases which I believe are made by Fiocchi. I am intending to use one piece plastic cup wads from a company in the UK and over powder cards to adjust the wad column to enable me to get a good roll crimp. Alliant powders such as Unique and Blue Dot are the most readily available in the UK and I am after some starting loads using these powders. I have seen a thread on here where the poster suggested a load of 23grains of Unique for a velocity of 1200FPS with a 1oz slug. The loaded rounds will be fired through an Ithaca 37 Deerslayer and are solely for competition target use. I have been relaoding metallic rifle and pistol cartridges for years and the load data is much easier to come by as the case capacity doesnt vary as it does with a shotgun case/wad combination. I'm after a reasonable generic starting point load using Unique and Blue Dot so that I can start working up accurate loads without generating excessive pressure. Any suggestions and thank you for taking the time to read this.