45-70 is my main hunting cartridge for big game in brush. I prefer a short barrel ( mines 16.25") I've killed elk, deer, moose, bear with mine. I hunt with peeps/ ghost ring or red dot. I shoot hard cast handloads at 1600fps and sero at around 158yds. This puts my poi at +3@50 +4@100, -1@150 and
-7.5@200....interesting my 175 yd drop is -2.5
So basically in the 15 yds between 175 &200 it drops 5" making this a truly shorter range gun. It sure anchors critters though. If your looking for flat out killing things at bow range this is the caliber for you. Short trapper length guns are my favorite for this purpose. The 45-70 looses very minimal fps/ 1"barrel loss. My brothers 22" barrel shoots my same load at only 30fps faster than my 16.25" barrel. Sight radius is the reason the cowboys have longer barrels but for 100-175yd accuracy a 16"+the action length radius is more than plenty for hunting accuracy.
The 45-70 is truly a reloaders round as factory fodder is crazy expensive if you can find it right now. With handloading I can keep my hunting rounds to around .58$/ round...light plinking loads can be made for under .40$/ round... good luck even coming close to that using factory ammo. My favorite rifles are the marlin offerings but henry makes a decent rifle as well. Imo the 22-26" barrel rifles are great for more target work or stand hunting where the barrel length is no hindrance. For a walking rifle I highly recommend the 16-18" lengths as they are just so much more handy and performance wise you give up very little.
Ps plinking loads made with pistol powders such as trail boss, red dot, and unique are amazing fun and light on the shoulder and given a high enough rear sight elevation can be used all the way out to 1k. Check out some of sagebrush longshots on YouTube. Those guys and their big 45-70s are pure awesome...