One round out of my T/C Contender in .45-70 is enough. A tapered barrel with that much hole weighs nothing. Of course it's OK with 405 gr rounds, but what are they-800 fps? A 300 gr Rem or Win is punishing to say the least. I haven't fired it in many years. I've found life's too short to dance with nasty guns.
Actually it's practically been that long for my Redhawk as well. 10mm seems my nastiest these years.
Join the NRA/ILA
I am the weapon; my gun is a tool. It's regrettable that with some people those descriptors are reversed.