Black bear are not tough to kill, many are shot dead with satisfaction using 6mm. The 308 Win is plenty potent and rendering pinpoint accuracy at those ranges. The 35 Rem is an underestimated killer at 100 yards, anything hit right within range is dead. FTX bullets are a marketing joke in a tube feed lever gun. The tube feed lever is a pure killer with JHP, JFP and HC. For 45-70 the JHP in the 300 gr dumps massive expansion, shock and wounding at that range. Any quality JFP in 350gr weight at 2,200 fps will cut a black bear in two. As far as 45-70 HC in 400gr+, not really necessary as they will pass through easily at that range.
