Nielsen slug question

[johnp]

Can anybody tell me if these slugs work in the FX Crown smooth twist X Barrel if so what diameter should I order and should I get the dish or the flat base?

Thanks in advance

https://nielsenspecialtyammo.com/products/43-8-grain-225-count-300-slug-nsa

 

[justcbri]

You could try contacting Nielson directly, he seems to have a good idea on this sort of thing.