As an example:...These loads do not exceed 40K PSI(not CUP) according to the author.

Note the water capacity left when the bullet is seated to the listed depth..It is totally impossible to double charge these loads..I left some out as I am having problems with photobucket this morning.

The blown Marlins come from using the wrong powder or user error not double charging a load with the appropriate powder or to many grains of the appropriate powder..

I never use pistol powders in any of my 45-70's.There is plenty of pressure checked data for the 45-70 from mild to wild using appropriate powders.

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Starline Brass was used in all these loads!!!!

Jayco