Has anyone worked on any 300/350 gr. loads using JHP's or cast bullets, nothing HOT, just someting to have some fun with.

Thanks Marty

Marty,
        The 450 has just slightly less case capacity than the 45-70 so any of the low pressure "trap door" loads should be fine for your purposes,check the hodgdon and IMR websites for data.  
                                                    KevinNY