At 140 years old in old form and around 45 years old in new form. Today the 45 is the equal of the 44mag and does it with less pressure a bit fatter bullet and a little more bullet weight if wanted. Bullets in the 300/340 grain range work well on anything walking the earth. If you are not a handloader many outfits make fine hunting ammo for the 45colt. My 454 now days gets fed ten of the 45 to every one of the 454 and the 45colt is in the gun when hunting because I shoot it better,alot better.
Now for the 1873 Colt/clones shooters these new 45colt rounds are not for your guns,you need a more modern SA. The good news with the better bullets out there and 1873 power you can still hunt deer and such and bring home meat if you know your limits out to about fifty yards.