Gewehr98
I use Varget in my guide gun(18" barrel) with rem 405's. My load is with 55.8gr of powder. It sends them down range @ 1600fps. It's too hot for a trapdoor but your Ruger #1 shouldnt be a problem. This load is ever so slightly compressed and I can routenly shake 5 kernles of powder out of the case after firing, There are none in the bore. Strange....
I've also used RE#7 , That stuff is really clean and you can also get more speed (2000fps with 405's) But sending 405's that fast is very difficult to hang on too in such a short gun
For all the info you could ever want on the 45-70 try the big bore fourms at marlin's web page
http://www.marlinfirearms.com
there is no moderator so the name calling and fighting can get out of hand sometime.
Cajun