Seating depth of 500 gr. boolit with smokeless powder

[webradbury]

I just got my Lee 458-500-3R mold in today and plan to load some smokeless rounds for my C Sharps 1874 45-70.

Is there any data available for this boolit concerning minimum OAL. I have seen favorite loads for this boolit posted here but no seating depth info. Thanks in advance, Will.

[MT Chambers]

If it's not too hot a load, I would have it engrave by the rifling, that is how I load my BP 45/70 loads.