Take a look at Barnes load data for the 45-70 with the 250gr TSX. Smoking fast for a 45-70. Just don't mix up the load information. The ruger load is too hot for the Marlin action. You'd also need a 24" tube to reach those velocities. Something like the Marlin XLR or similar.
http://barnesbullets.com/files/2014/11/45-70RugerNo1.pdfhttp://barnesbullets.com/files/2014/11/45-70Marlin1895Web.pdf
Last edited by obie458; 08/28/17.
